JPH11313346A - Device for inspecting projected video image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct inspection of color slurring and uneven illuminance in an entire area and a partial area of a projected video image and to adjust elimination of the unevenness with high accuracy in an excellent way. SOLUTION: A liquid crystal projector 300 projects a video image onto a screen 11 on which pluralities of chromaticity illuminance sensors 12 are mounted. A color camera 13 photographs the projected video image. Relatively tentative illuminance of pixels whose position corresponds to the chromaticity illuminance sensors 12 among the picked-up image data is compared with an absolute illuminance by the chromaticity illuminance sensors 12 to convert the relatively tentative chromaticity and tentative illuminance into absolute chromaticity and illuminance and the inspection is executed based on the absolute chromaticity and illuminance after the conversion. Furthermore, correction data are also generated. The correction data are fed back to the liquid crystal projector 300 to eliminate color slurring and uneven illuminance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection image inspection apparatus for inspecting / adjusting image display quality by measuring an optical quantity of an image projection apparatus.
The present invention relates to a liquid crystal projector inspection device for inspecting / adjusting illuminance.

[0002]

2. Description of the Related Art FIG. 21 is a sectional view showing a schematic structure of a lamp unit 500 provided in an optical module of a liquid crystal projector. In FIG. 21, the reference numeral 50
1 is a lamp case, 502 is a reflector, 503 is a discharge tube, and 504 is a lead wire. A reflector 502 and a discharge tube 503 are attached to a lamp case 501.

[0003] Conventionally, there has been a problem that unevenness in color or illuminance occurs in an image projected on a screen due to the structure and mounting accuracy of a lamp unit. If the relative positional relationship of the discharge tube 503 with respect to the reflector 502 or the relative positional relationship of the reflector 502 with respect to the lamp case 501 is not within the adjustment standard range, the overall color unevenness and illuminance when projecting an image from the optical module onto the screen. Unevenness occurs. In the process in which the light emitted from the discharge tube 503 and reflected by the reflector 502 reaches an optical engine such as a liquid crystal panel in the optical module, the lead 504 and a projection 503 a for vacuum sealing the discharge tube 503.
, And this shadow causes partial color unevenness and illuminance unevenness on the screen.

Since the occurrence of such color unevenness and illuminance unevenness naturally causes deterioration of display quality, it is necessary to inspect and adjust before shipping.

FIG. 22 shows a schematic configuration of a liquid crystal projector inspection apparatus 600 according to the prior art. An optical module 701 of the liquid crystal projector 700 is a unit in the liquid crystal projector 700, and a liquid crystal panel for controlling an image,
The liquid crystal panel includes a lamp unit (not shown) for irradiating high-intensity light to the liquid crystal panel, an optical prism for projecting an image on the screen 601, a lens, and the like.
The portion of the optical module excluding the lamp unit is called an optical engine.

[0006] The LCD projector inspection apparatus 600 includes a screen 601 for displaying an image projected from the optical module 701 of the liquid crystal projector 700, and a screen 6.
A chromaticity sensor 602 for detecting chromaticity disposed at a plurality of positions (four corners and five positions at the center) is provided. A chromaticity sensor input unit 60 as an input interface for inputting a detection signal from each chromaticity sensor 602
3, a chromaticity value measuring unit 604 that converts the input detection voltage from each chromaticity sensor 602 to an actual chromaticity value, and compares the chromaticity value from each chromaticity sensor 602 with the inspection standard value for the liquid crystal projector 700. Measurement result comparing unit 605
A measurement result output unit 606 that outputs a comparison result between the chromaticity value of each part by the chromaticity sensor 602 and the inspection standard value by the measurement result comparison unit 605 to a monitor, a printer, or the like;
A chromaticity value averaged data creation unit 607 for creating an average value of the chromaticity values by the five chromaticity sensors 602, and taking a difference between the average value of the chromaticity values and the center value of the inspection standard value of the liquid crystal projector 700 An averaged chromaticity value correction data generation unit 608 that generates correction amount data for adjusting to the center value and outputs the data to the liquid crystal projector 700 is provided. on the other hand,
The liquid crystal projector 700 includes an averaged chromaticity value correction data input unit 702 for inputting correction data from the averaged chromaticity value correction data creation unit 608, and an averaged chromaticity value correction data storage for storing the input correction data. A chromaticity unit 703 and a chromaticity control unit that controls the chromaticity values of the entire image projected by the liquid crystal projector 700 so that the chromaticity values of the entire image projected by the liquid crystal projector 700 are substantially equal to each other, based on the stored correction data, so that the color tone and the like are adjusted by the television receiver. And a value correction control circuit unit 704.

Although only the configuration for inspection and adjustment of chromaticity has been described above, the illuminance value is similarly configured. In other words, although not shown, the “chromaticity” in the above description is replaced with “illuminance”, and the chromaticity values arranged at a plurality of positions (four corners and five central points) of the screen 601 are detected. Sensor, an illuminance sensor input unit for inputting a detection signal from each illuminance sensor, an illuminance value measuring unit for converting an input detection voltage from each illuminance sensor into an actual illuminance value, and five illuminance sensors Illuminance value averaging data creating unit for creating an average illuminance value according to the illuminance value, and correction amount data for adjusting the illuminance value to the center value by taking the difference between the average illuminance value and the center value of the inspection standard value of the liquid crystal projector And an averaged illuminance value correction data creating unit for creating the illuminance value and outputting the same to the liquid crystal projector. On the other hand, the liquid crystal projector has an averaged illuminance value correction data input unit for inputting correction data from the averaged illuminance value correction data creation unit, an averaged illuminance value correction data storage unit for storing the input correction data, and a storage unit. And a control circuit for correcting an illuminance value that controls the illuminance value of the entire projection image to be substantially equal based on the corrected data. Note that the measurement result comparison unit 60
5 is configured to compare the illuminance value of each illuminance sensor with the inspection standard value for the liquid crystal projector, and the measurement result output unit 606 compares the illuminance value of each part by the illuminance sensor and the inspection standard value by the measurement result comparison unit. The result is output to a monitor or a printer.

[0008]

The above-mentioned prior art has the following problems.

(1) Since only a few chromaticity sensors / illuminance sensors are used, only a few chromaticity / illuminance values, such as sensor placement locations on the screen, can be measured, but the entire display screen can be measured. Can not do. As a result, even if color unevenness / illuminance unevenness occurs in a portion where the sensor is not arranged, it cannot be detected and cannot be adjusted.

(2) It is assumed that the chromaticity value / illuminance value of the liquid crystal projector is adjusted based on the detection results of several sensors, and the entire display screen is adjusted based on the average value of several sensors. , The chromaticity / illuminance is corrected in the same way, so that, for example, it is possible to make corrections such as bringing a pale display screen closer to white, but it is possible to adjust partial color unevenness / illuminance unevenness. Can not.

(3) If an attempt is made to measure the entire projection image using only the sensors, a very large number of sensors are required, and the cost of the apparatus becomes considerably higher and the measuring time becomes longer as compared with an inspection apparatus using only a few sensors. .

(4) When the life of the discharge tube has expired, the lamp unit is replaced. However, since the optical engine and the lamp unit are separately assembled and adjusted in the optical module, the lamp unit is simply replaced. It is not possible to adjust the overall and partial color unevenness / illuminance unevenness of the projected image in a state most suitable for the lamp unit due to the accuracy of assembling adjustment of the lamp unit and variations in lamp characteristics.

An object of the present invention is to solve the above-mentioned problems.

[0014]

According to a first aspect of the present invention, there is provided a projection image inspection apparatus, comprising: a portion corresponding to an optical amount of an optical sensor arranged on a screen and a position corresponding to the optical sensor in imaging data of a projection image on the screen. The absolute optical quantity of the projected image is measured based on the comparison with the optical quantity of the above, and the measurement result is output. The optical amount based on the imaging data of the projected image is relative to the optical sensor unlike the optical sensor. An accurate inspection cannot be performed with this relative optical quantity. Therefore, a parameter is obtained by comparing the optical amount of the portion corresponding to the position of the optical sensor in the imaging data with the absolute optical amount of the optical sensor, and the relative optical amount of the projected image is obtained based on the parameter. Since the result is converted into an absolute optical quantity and the result is output, an accurate inspection can be performed. Since the absolute optical amount of the projected image is obtained, it is possible to detect optical unevenness in the entire area and the partial area of the projected image. The number of optical sensors required for that purpose may be small. With a large number of optical sensors that fill the screen, you may think that absolute optical quantities can be measured in many areas to eliminate optical irregularities while meeting required product standards. However, there are too many optical sensors, which leads to a serious and serious cost increase and an extremely long processing time. The ability to measure the absolute optical quantity of all pixels on a pixel-by-pixel basis with a small number of optical sensors and imaging means meets the required product standards while offering advantages in cost and processing time In this state, it is possible to eliminate optical unevenness, which is extremely important, and this point is the most important point of the present invention.

According to a second aspect of the present invention, there is provided a projection image inspection apparatus according to the first aspect, wherein the optical sensor is a chromaticity / illuminance sensor, the image data is a color camera, and a relative image based on the image data. A temporary chromaticity value / temporary illuminance value is converted into an absolute chromaticity value / illuminance value by the chromaticity value / illuminance value by the chromaticity / illuminance sensor. Image data based on image data captured by a color camera is relative, unlike a chromaticity / illuminance sensor. An accurate inspection cannot be performed with the relative provisional chromaticity value and provisional illuminance value. Therefore, the parameters are obtained by comparing the provisional chromaticity value / provisional illuminance value at the position corresponding to the chromaticity / illuminance sensor in the image data with the absolute chromaticity value / illuminance value of the chromaticity / illuminance sensor. Then, based on the parameters, the relative provisional chromaticity value / provisional illuminance value of the projected image is converted into an absolute chromaticity value / illuminance value, and the result is output, so that accurate inspection can be performed. Since the absolute chromaticity value and illuminance value of the projected image are obtained, it is possible to detect the color unevenness and the illuminance unevenness in the whole and partial areas of the projected image. The number of chromaticity / illuminance sensors required for that purpose may be small.

According to a third aspect of the present invention, there is provided the projection image inspection apparatus according to the second aspect, wherein correction data is created by comparing the absolute chromaticity value / illuminance value with the reference data, and the optical data of the image projection apparatus is obtained. The chromaticity value and the illuminance value of the system are configured to be corrected. Correction data is generated by comparing with reference data that defines a standard range that is optimal for the optical characteristics of the video projection device, and the chromaticity and illuminance values of the optical system of the video projection device are corrected. Optical characteristics can be made appropriate.

According to a fourth aspect of the present invention, there is provided the projection image inspection apparatus according to the first aspect, wherein the optical sensor is an illuminance sensor, the image data is obtained by a monochrome camera, and a relative temporary image based on the image data is obtained. The illuminance value is converted into an absolute illuminance value by the illuminance value of the illuminance sensor. Image data based on data captured by a monochrome camera is relative, unlike an illuminance sensor. An accurate inspection cannot be performed with this relative provisional illuminance value.
Therefore, a parameter is obtained by comparing a temporary illuminance value at a position corresponding to the illuminance sensor in the image data with an absolute illuminance value obtained by the illuminance sensor, and based on the parameter, a relative temporary illuminance of the projected image is obtained. Since the value is converted into an absolute illuminance value and the result is output, accurate inspection can be performed. Since the absolute illuminance value of the projected image is obtained, it is possible to detect uneven illuminance in the entire area and the partial area of the projected image. The number of illuminance sensors required for that purpose may be small. Since the image data is monochrome, the spatial resolution is tripled as compared to the case of color data. The circuit configuration is simplified, the processing speed is increased, and the cost is also advantageous.

According to a fifth aspect of the present invention, in the projection image inspection apparatus according to the fourth aspect, correction data is created by comparing the absolute illuminance value with the reference data, and the illuminance value of the optical system of the video projection device is adjusted. Is corrected. Correction data is generated by comparing with reference data that defines a standard range that is optimal for the optical characteristics of the image projection device, and the illuminance value of the optical system of the image projection device is corrected. I can do it properly.

According to a sixth aspect of the present invention, there is provided a projection image inspection apparatus according to any one of the first to fifth aspects, wherein the screen, the image projection device, and the imaging means are relatively displaceable; It is configured to correct the imaging data of the optical sensor mounting position. The projected image on the optical sensor is in a state different from the original state of the projected image due to the optical characteristics of the optical sensor. Therefore,
By displacing the screen relative to the image projection device and the imaging means, the image previously projected on the optical sensor is switched to a state of being projected on the screen, and image data of the original projected image is obtained. Can be.

According to a seventh aspect of the present invention, there is provided the projection image inspection apparatus according to any one of the first to fifth aspects, wherein another normal screen can be moved back and forth with respect to the front surface of the screen having the optical sensor. To correct the imaging data at the optical sensor attachment position.
Since an image is projected and captured on a normal screen without an optical sensor, image data of an original projected image can be obtained.

According to an eighth aspect of the present invention, in the projection image inspection apparatus according to the third or fifth aspect, the correction data unique to the lamp unit is inputted to the projection image inspecting apparatus to obtain the illuminance value or chromaticity of the optical system of the image projection apparatus. It is configured to correct the value / illuminance value. When the lamp unit is replaced, the lamp unit can be adjusted so as to match the optical characteristics of the lamp unit, thereby eliminating color unevenness and illuminance unevenness.

According to a ninth aspect of the present invention, there is provided a projection image inspection apparatus according to any one of the first to eighth aspects, wherein the image projection apparatus is a liquid crystal projector. The technical advantages of the present invention are best reflected.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquid crystal projector inspection apparatus as an example of a projection image inspection apparatus according to the present invention will be described below in detail with reference to the drawings.

[Embodiment 1] Embodiment 1 is configured to inspect and adjust both the chromaticity value and the illuminance value.

FIG. 1 is a system configuration diagram showing a schematic configuration of a liquid crystal projector inspection apparatus 200 and a liquid crystal projector 300 according to the first embodiment. An optical module 301 of the three-panel liquid crystal projector 300 is a unit in the liquid crystal projector 300, and includes a liquid crystal panel for controlling an image to be displayed, a lamp unit for irradiating the liquid crystal panel with high-luminance light, and a screen for displaying the image. It is composed of an optical prism, a lens, and the like for projecting the image on the projection 11. At the time of inspection / adjustment, the optical module 301 projects a solid white color image pattern as a reference for inspection / adjustment.

The liquid crystal projector inspection apparatus 200 includes a screen 11 for displaying an image projected from the optical module 301 of the liquid crystal projector 300 as a mechanical element.
And a chromaticity / illuminance sensor 12 for detecting chromaticity / illuminance values arranged at nine places (3 × 3) on the screen 11
And a color camera 13 for taking an image of the entire screen 11. A mounting hole is formed in a flat plate-shaped or sheet-shaped screen 11, and a chromaticity / illuminance sensor 12 is embedded in the mounting hole. Screen 11
Is coated white.

The liquid crystal projector inspection apparatus 200 includes a chromaticity / illuminance sensor input unit 2 as an input interface for inputting a detection signal from each chromaticity / illuminance sensor 12.
1 and a chromaticity value for converting the input detection voltage from each chromaticity / illuminance sensor 12 to an actual absolute chromaticity value / illuminance value.
An illuminance value measuring unit 22; an image input unit 23 for inputting image signals for the entire projected image on the screen 11 from the color camera 13 and storing the input image signals as color image data in an RGB data table T1 in an image memory; , A temporary chromaticity value that is a relative chromaticity value and a temporary illuminance value that is a relative illuminance value for each pixel in the entire projected image area on the screen 11 are calculated based on the temporary chromaticity value and the temporary illuminance value in the image memory. A temporary chromaticity value / temporary illuminance value table creation unit 24 to be stored in the illuminance value table T2, and a temporary chromaticity value corresponding to the position of each chromaticity / illuminance sensor 12 in the table T2 (this is measured in advance) A sensor position data extraction unit 25 for extracting a temporary illuminance value, and a relative temporary chromaticity value at each sensor position.
A chromaticity value / illuminance value correction coefficient calculation unit 26 that compares the absolute chromaticity value / illuminance value by the illuminance value measurement unit 22 and calculates a correction coefficient (parameter) as a result of the comparison, based on the correction coefficient The absolute chromaticity value / illuminance value is corrected from the relative temporary chromaticity value / temporary illuminance value for each pixel in the entire projected image on the screen 11 in the image memory of the image input unit 23, and the absolute chromaticity value / illuminance value is calculated in the image memory. Absolute chromaticity value / illuminance value calculation unit 27 stored in the target chromaticity value / illuminance value table T3, and reference data preliminarily storing the chromaticity value / illuminance value (reference data) of the standard for the liquid crystal projector 300. The storage unit 28 and the absolute chromaticity value / illuminance value calculation unit 2
7, a measurement result comparison / determination unit 2 that compares the absolute chromaticity value / illuminance value obtained by the correction with the standard chromaticity value / illuminance value in the reference data storage unit 28 to determine whether the value is within an allowable range.
9 and the absolute illuminance value obtained by the absolute chromaticity value / illuminance value calculation unit 27 and the data of the absolute chromaticity X coordinate and chromaticity Y coordinate, and the judgment result by the measurement result comparison judgment unit 29 (good / good)
(Defective) to a monitor or a printer, etc., an absolute chromaticity value / illuminance value by the absolute chromaticity value / illuminance value calculation unit 27, and a standard chromaticity value by the reference data storage unit 28 A correction data creation unit 31 that creates and temporarily stores correction data of chromaticity values and illuminance values based on comparison with the illuminance values, a correction data storage unit 32 that stores the correction data, and The liquid crystal projector 300 includes a correction data output unit 33 that outputs the data to the liquid crystal projector 300 and an auxiliary storage device 34 such as a hard disk that stores various data including the correction data.

Here, before the description of the configuration of the liquid crystal projector 300, the structure of the image memory in the liquid crystal projector inspection apparatus 200 will be described. Each pixel in the entire projected image on the screen 11 is represented as shown in FIG. It is nxm dots (m rows and n columns). For example, if n = 576 and m = 540, the total number of pixels is 311 and 040 pixels. When the pixel number of the i-th row and the j-th column is represented by A _ij , for example, A _1n = A ₁ , ₅₇₆ , A _m1
= The _{A 540, 1, A mn =} A 540, 576.

As shown in FIG. 4, addresses in the image memory are designated by pixel numbers A _ij (i = 1 to m, j = 1 to n). In the RGB data table T1 related to the image input unit 23 in the image memory, R, G, and B image data R _ij input from the color camera 13 to the address of each pixel number A _ij corresponding to each pixel in the entire projected video. , G _ij , and B _ij are stored.

The relative provisional illuminance value P _ij and color relative to each pixel in the entire projected image created by the provisional chromaticity value / provisional illuminance value table creation unit 24 based on the image data R _ij , G _ij , and B _ij. Provisional chromaticity X coordinate X _ij and provisional chromaticity Y in the chromaticity diagram
The values of the coordinates Y _ij are stored in the temporary chromaticity value / temporary illuminance value table T2 of the image memory corresponding to each pixel in the entire projected video. Using f _k () as a function symbol, provisional illuminance value P _ij = f ₁ (R _ij , G _ij , B _ij ) provisional chromaticity X coordinate X _ij = f ₂ (R _ij , G _ij , B _ij ) provisional chromaticity Y coordinate Y _ij = f ₃ (R _ij , G _ij , B _ij ).

The absolute chromaticity value / illuminance value calculation unit 27 calculates a relative provisional illuminance value P _ij , provisional chromaticity X coordinate X _ij , and provisional chromaticity Y coordinate Y _ij
And the absolute illuminance value P ′ _ij for each pixel and the absolute chromaticity X coordinate X in the chromaticity diagram over the entire projected image created based on the correction coefficient by the chromaticity value / illuminance value correction coefficient calculation unit 26 ' _Ij and the value of the chromaticity Y coordinate Y' _ij are stored in the absolute chromaticity value / illuminance value table T3 of the image memory corresponding to each pixel in the entire projection video.

The above operation will be described with reference to a flowchart of a subroutine for creating measurement data in FIG. In step n1, signals of chromaticity value / illuminance value detected from each of the nine chromaticity / illuminance sensors 12 are input to the chromaticity / illuminance sensor input unit 21, and in step n2, the chromaticity value / illuminance sensor
The absolute chromaticity value / illuminance value is measured based on the signal input by the illuminance value measurement unit 22. In step n3, image data R _ij , G _ij , B _ij (i = 1 to m, j) of a reference solid white image pattern for inspection and adjustment over the entire projected image on the screen 11 captured by the color camera 13
= 1 to n) is input to the image input unit 23, and in step n4, the image data R _ij , G _ij , and B _ij are stored in the RGB data table T1. In step n5, the provisional chromaticity value
The temporary illuminance value table creation unit 24 outputs the image data R _ij , G _ij ,
A relative temporary illuminance value P _ij is created based on B _ij and stored in the temporary chromaticity value / temporary illuminance value table T2. In step n6, the temporary chromaticity value / temporary illuminance value table creation unit 24 outputs the image data R _ij , G _ij , B _ij based on the provisional chromaticity X coordinate X
and stores _ij and Kariirodo Y coordinate Y _ij create a temporary chromaticity values, temporary illuminance value table T2. In step n7, the sensor position data extraction unit 25 sets the nine chromaticity / illuminance sensors 12
9 in the absolute chromaticity value / illuminance value table T3 based on sensor position data registered in advance.
The absolute illuminance value P ' _ij , the absolute chromaticity X coordinate X' _ij and the absolute chromaticity Y coordinate Y ' _ij are stored at the address of the pixel number A _ij of one pixel.

The sensor position data extracting section 25 is as follows. When inspecting / adjusting the chromaticity value / illuminance value of the liquid crystal projector 300, the position of the chromaticity / illuminance sensor 12 on the screen 11 is usually projected onto the screen 11 so as to have a projection image area of a fixed size. Also, the imaging area of the color camera 13 with respect to the screen 11 can be made constant in advance. Therefore, when setting the liquid crystal projector inspection apparatus 200, the position of the chromaticity / illuminance sensor 12 is imaged by the color camera 13, and the chromaticity / illuminance is measured based on the analysis of the image data.
The position data of the illuminance sensor 12 is registered in the memory in advance.

An example of _obtaining an absolute illuminance value P ' _ij from a relative temporary illuminance value P _ij will be described. As shown in FIG. 5, the whole area of the projected image on the screen 11, that is, the storage area of the image data in the image memory is 9 blocks B ₁ of 3 × 3.
Divided into ~B _9. The whole is 576 × 540 pixels.
Pixel number of the central pixel of the chromaticity-illuminance sensor 12 ₁ A
_{90, 96,} the pixel number of the central pixel of the chromaticity-illuminance sensor 12 ₂ A _{270, 96,} the pixel number of the central pixel of the chromaticity-illuminance sensor 12 ₃ A _{450, 96,} a chromaticity-illuminance sensor 12 ₄
The pixel number of the center pixel of the A _{90, 288,} the pixel number of the central pixel of ...... chromaticity-illuminance sensor 12 ₉ A _{450, 480}
However, relative provisional illuminance values of the respective center pixels by the color camera 13 are P ₉₀ , ₉₆ ,
_{P 270, 96, P 450,} 96, P 90, 288, ...... are P _{450, 480,} also the absolute illuminance values by the chromaticity-illuminance sensor 12 ₁ to 12 _9, Q _{90, 96,} Q ₂₇₀ , ₉₆ , Q ₄₅₀ , ₉₆ ,
Q ₉₀ , ₂₈₈ ,... Q ₄₅₀ , ₄₈₀ . Therefore, the coefficient k
₁ , k ₂ , k ₃ , k ₄ ... K ₉ , k ₁ = P ₉₀ , ₉₆ / Q ₉₀ , ₉₆ k ₂ = P ₂₇₀ , ₉₆ / Q ₂₇₀ , ₉₆ k ₃ = P ₄₅₀ , ₉₆ / Q ₄₅₀ , ₉₆ k ₄ = P ₉₀ , ₂₈₈ / Q ₉₀ , ₂₈₈ ... K ₉ = P ₄₅₀ , ₄₈₀ / Q ₄₅₀ , ₄₈₀ . In each of the blocks B ₁ , B ₂ , B ₃ , B _4, ..., B ₉ , the absolute illuminance value P ′ _ij of a pixel having an arbitrary pixel number A _ij is calculated as follows.

P ′ _ij = k ₁ × P _ij (block B ₁ ) P ′ _ij = k ₂ × P _ij (block B ₂ ) P ′ _ij = k ₃ × P _ij (block B ₃ ) P ′ _ij = k ₄ × P _ij (block B ₄ )... P ′ _ij = k ₉ × P _ij (block B ₉ ). The absolute chromaticity X coordinate X ' _ij and chromaticity Y coordinate Y' _ij are also obtained in the same manner.

As described above, the absolute chromaticity and illuminance values of all the pixels can be measured for each pixel by the small number of chromaticity and illuminance sensors 12 and the color camera 13. Even without the chromaticity / illuminance sensor 12, the illuminance values, chromaticity X coordinates,
Although the chromaticity Y-coordinate can be measured, it is only a relative thing, and it is impossible to perform inspection and adjustment so as to conform to a required product standard. When only a small number of chromaticity / illuminance sensors 12 are used without using the color camera 13, it is impossible to make adjustments to eliminate uneven illuminance and uneven color. If a large number of chromaticity and illuminance sensors are used to fill the screen, the absolute illuminance value, chromaticity X coordinate, and chromaticity Y coordinate are measured in a large number of areas and conform to the required product standards. It may be possible to perform inspections and adjustments to eliminate uneven illuminance and color, but the number of chromaticity and illuminance sensors will be too large, resulting in serious and serious cost increase and extremely long processing time. It becomes something. The fact that the absolute number of chromaticity and illuminance values for all pixels can be measured in pixel units by a small number of chromaticity and illuminance sensors 12 and the color camera 13 means that both cost and processing time can be reduced. It is extremely important because it enables inspection and adjustment to eliminate uneven illuminance and uneven color while maintaining the advantage and conforming to the required product standards.

There are other methods for _obtaining the absolute illuminance value P ′ _ij and the absolute chromaticity X coordinate X ′ _ij and chromaticity Y coordinate Y ′ _ij , which will be described later. 12,
See FIG. 13).

Returning to FIG. 10, in step n8, based on the result of step n7, the absolute illuminance value P ′ _ij and the absolute chromaticity X coordinate X ′ _ij for all the remaining pixels
And the chromaticity Y coordinate Y ′ _ij, and the corresponding pixel number A in the absolute chromaticity value / illuminance value table T3 shown in FIG.
Stored at the address of _ij . In step n9, the absolute illuminance value and absolute chromaticity X coordinate and chromaticity Y coordinate for all the pixels are output from the measurement result output unit 30. That is, it is displayed on a monitor or printed by a printer. The result (good / bad) of the comparison with the reference data from the reference data storage unit 28 in the measurement result comparison determination unit 29 is also output.

Next, returning to FIG.
00 will be described. LCD projector 300
The chromaticity value / illuminance value correction data input unit 41 for inputting and storing the correction data received from the correction data output unit 33 of the liquid crystal projector inspection apparatus 200, and the optical module 301 in the optical module 301 based on the input correction data. A chromaticity value / illuminance value correction data calculation unit 42 for converting the data into a control amount necessary for controlling the liquid crystal panel of the engine; Chromaticity / illuminance value correction data storage unit 43 for storing correction data for correcting the chromaticity value / illuminance value of each pixel in the entire area of the image projected on the screen based on the correction data. And a chromaticity / illuminance value correction control circuit section 44 for controlling the chromaticity value / illuminance value. The chromaticity value / illuminance value correction data calculation unit 42 converts the input correction data into 8-bit or 16-bit control data (also referred to as correction data) suitable for internal handling.
It has the function of converting to.

Next, the operation of the liquid crystal projector inspection apparatus 200 configured as described above will be described.

First, before entering the actual operation state, reference data is created. The operation of creating the reference data will be described with reference to the flowchart of FIG. To create the reference data, a reference optical engine and a reference lamp unit are used. As described above, the optical module includes the optical engine and the lamp unit, and the optical engine indicates a portion of the optical module except for the lamp unit, and includes a liquid crystal panel, an optical prism, a lens, and the like. The reference optical engine is an optical engine that has been accurately adjusted to the center value of the adjusted standard value in all adjustments such as adjustment of the mounting position of the liquid crystal panel and convergence. The reference lamp unit is a lamp unit in which the adjustment of the mounting position of the reflector 502 and the discharge tube 503 with respect to the lamp case 501 and the adjustment of the optical characteristics of the lamp to the center value of the adjustment standard value have been completed. In step S11, a reference solid white image pattern for inspection / adjustment is projected onto the screen 11 from the reference optical module 301 including the reference optical engine and the reference lamp unit. In step S12, the absolute chromaticity value and illuminance value of each pixel in the entire projected image on the screen 11 are measured using the chromaticity / illuminance sensor 12 and the color camera 13. The measurement of the chromaticity value / illuminance value in step S12 is performed in steps n1 to n1 of the subroutine in FIG.
n9. In step S13, the chromaticity value
The reference optical module 30 based on the measurement data of the illuminance value
Create reference data for 1. In step S13, the reference data is stored in the reference data storage unit 28 and the auxiliary storage device 34.

A method of creating reference data from measured data will be described with reference to FIG. FIG. 6 shows a data memory for illuminance values. This stores three items of data. The first item is illuminance value data to be stored in a memory inside the liquid crystal projector 300, and the liquid crystal projector 300 controls brightness by a control circuit based on the illuminance value data. The second item is data of the illuminance value (lx) measured by the chromaticity / illuminance sensor 12. The third item is illuminance value data acquired by the color camera 13 for the illuminance value of the second item. First, as shown in FIG.
The memory data in “0” is set to “1000”, and a solid white image pattern as a reference for inspection / adjustment is projected on the screen 11 from the liquid crystal projector 300, and the illuminance acquired by the chromaticity / illuminance sensor 12 at this time. Change the value data to "50
0 ", and the illuminance value data acquired by the color camera 13 is stored as" 150. "These illuminance value data values are merely examples.The same applies to the following. The same measurement is performed after shifting by “900” by a fixed amount “100”, and “450” and “140” are stored. The measurement is performed, and then the value is incremented to the lower side.
Increment sequentially to the higher side as follows. Although the intermediate memory data is not incremented because it is shifted by a certain amount, interpolation processing is performed on the intermediate memory data to obtain interpolation data. The reference data for the illuminance value is created as described above. Similarly, reference data for the chromaticity value is created. Normally, the creation of reference data using the reference optical engine and the reference lamp unit is performed only once at first.

When it is desired to change the current illuminance value of the liquid crystal projector 300 from "600 lx" to, for example, "500 lx", the illuminance value stored in the memory in the liquid crystal projector 300 is compared with that of FIG. The data is reduced from the current “1200” by “200” to “100”.
0. In this case, actually, "500 l"
It should be adjusted to the vicinity of x "because there is a variation in the optical system and circuit system of the liquid crystal projector 300, and this causes some errors.
Therefore, by repeating the measurement (S33 in FIG. 9)
-S41), and finally bring the value of the illuminance value data to just "500lx". Then, the illuminance value data at that time is
Illumination value correction data table 51 (FIG. 2)
See).

Next, the operation of creating correction data for the lamp unit to be adjusted will be described with reference to the flowchart of FIG. The reference optical engine is also used to create the correction data for the lamp unit to be adjusted. In step S31, an optical module 301 having a reference optical engine and a lamp unit to be adjusted projects a reference solid white image pattern for inspection and adjustment onto the screen 11. In step S32, the absolute chromaticity value and illuminance value of each pixel in the entire projected image on the screen 11 are measured using the chromaticity / illuminance sensor 12 and the color camera 13. The measurement of the chromaticity value / illuminance value in step S32 is performed in steps n1 to n of the subroutine in FIG.
9. That is, signals of chromaticity values and illuminance values detected from the nine chromaticity / illuminance sensors 12 are input (n
1) The absolute chromaticity value and illuminance value are measured based on the input signal (n2), and image data R _ij , G _ij , and B _ij of the entire area of the image projected by the color camera 13 are input (n3). The image data R _ij , G _ij , and B _ij are stored in an RGB data table T1.
(N4), a relative temporary illuminance value P _ij is created based on the image data R _ij , G _ij , and B _ij , and stored in the temporary chromaticity value / temporary illuminance value table T2 (n5). Data R _ij , G
_A relative provisional chromaticity X coordinate X _ij and a provisional chromaticity Y coordinate Y _ij are created based on _ij and B _ij and stored in the provisional chromaticity value / provisional illuminance value table T2 (n6), and the nine colors are obtained. The absolute illuminance value P ' _ij and the address of the pixel number A _ij of the corresponding nine pixels in the absolute chromaticity value / illuminance value table T3 are based on the sensor position data registered in advance for the degree / illuminance sensor 12. The absolute chromaticity X coordinate X ' _ij and the chromaticity Y coordinate Y' _ij are stored (n7), and based on the stored results, the absolute illuminance values P ' _ij and absolute Chromaticity X coordinate X ′ _ij and chromaticity Y coordinate Y ′ _ij are calculated and stored at the address of the corresponding pixel number A _ij in the absolute chromaticity value / illuminance value table T3 (n8). Absolute illuminance value, absolute chromaticity X coordinate and chromaticity Y coordinate Measurement result output unit 30 outputs from the (monitor or printer) (n9).

Next, in step S33, the measurement result comparison / judgment unit 29 sets the absolute chromaticity value / illuminance value measured by the absolute chromaticity value / illuminance value table T3 of the absolute chromaticity value / illuminance value calculation unit 27. The chromaticity value and the illuminance value as a reference from the reference data storage unit 28 are compared for each pixel. Step S
At 34, the correction data creation unit 31 creates correction data suitable for the adjusted lamp unit based on the comparison result,
In step S35, the correction data is stored in the correction data storage unit 32. In step S36, the correction data output unit 33 reads the correction data from the correction data storage unit 32 and outputs the data to the chromaticity value / illuminance value correction data input unit 41 of the liquid crystal projector 300. In step S37, the optical module 301 including the reference optical engine and the adjusted lamp unit is controlled under the corrected condition,
An image pattern of a single solid white color as a reference for inspection and adjustment is projected on the screen 11. This liquid crystal projector 3
The adjustment at 00 will be described in detail separately (see FIG. 2). In step S38, the chromaticity / illuminance sensor 1
2 and the color camera 13, the absolute chromaticity value of each pixel over the entire projected image on the screen 11.
Measure the illuminance value. The measurement of the chromaticity value and the illuminance value in step S38 is performed in step n of the subroutine of FIG.
1 to n9. Then, since the correction data is not always appropriate, in step S39, the measurement result comparison / determination unit 29 determines the absolute chromaticity of all the re-measured pixels in the absolute chromaticity value / illuminance value table T3. It is determined whether the value / illuminance value is within the standard range of the liquid crystal projector 300. If the value / illuminance value is out of the standard range, the number of measurement repetitions i is set to the specified number I in step S40.
_It is determined whether or not the number has reached ₀ (i ≧ I ₀ ?). If this determination is NO, the process proceeds to step S41 to perform the increment process (i ← i + 1) of the number of measurement repetitions i, and then returns to step S33. The comparison of the measured data and the reference data, the generation of correction data, the output of the correction data to the liquid crystal projector, the projection of the video pattern under new correction conditions, the re-measurement, and the determination within the standard range are performed. If it is out of the standard range,
The measurement is repeated until the value falls within the specified range. If the number of repetitions i reaches the specified number I0 while the _value is out of the specified range, the process proceeds to step S42, where the measurement result comparison / determination unit 29 outputs the message data of the adjustment failure to the measurement result output unit. Output from 30 (monitor display or printout). On the other hand, when the absolute chromaticity values and illuminance values of all the pixels measured in step S39 are within the standard range, the process proceeds to step S43, and the process of creating the correction data for the adjusted lamp unit is completed. In step S44, the final correction data created by the correction data creation unit 31 is stored in the correction data storage unit 32, and is also stored in the auxiliary storage device 34 via the correction data output unit 33.
With this, the correction data of the chromaticity value and the illuminance value for each pixel in the entire projected image is created. Step S4
In step 5, the measurement result comparison / determination unit 29 outputs the message data of good adjustment from the measurement result output unit 30 (monitor display or printout).

The determination as to whether the value is within the standard range in step S39 is as follows. Chromaticity value of LCD projector
In order to ensure the quality of the illuminance value, the manufacturer defines the chromaticity value and the illuminance value of the inspection and adjustment standards for each product. As an example, the average value of the chromaticity value and the illuminance value in the entire projected image, the ratio of the value at the center of the projected image area to the value at the corner, the maximum value of the measured chromaticity value and the illuminance value and There is a standard for the difference from the minimum value. These standard values are registered in advance as parameter data for each product, and it is determined whether or not the measured chromaticity value / illuminance value is within the range of the registered standard values. If it is within the standard range, it is determined to be good, and if it is out of the standard range, it is determined to be defective.

Next, a more detailed configuration of the liquid crystal projector 300 will be described with reference to FIG. LCD projector 3
00 is roughly divided into a chromaticity / illuminance value correction data input unit 41 for inputting and storing the correction data 80 (see FIG. 7) received from the correction data output unit 33, and an optical module 301 for inputting the correction data. The chromaticity value for converting to the correction data for correcting the chromaticity value and the illuminance value as the control amount necessary for controlling the liquid crystal panel of the optical engine in
An illuminance value correction data calculating unit 42, a chromaticity value / illuminance value correction data storage unit 43 for storing the correction data, and a chromaticity value / A chromaticity value / illuminance value correction control circuit 44 for controlling the illuminance values to be uniform is provided.

The chromaticity value / illuminance value correction data storage unit 43
Illuminance value correction data table 51 and R out of R, G, B
A chromaticity value correction data table 52, a chromaticity value correction data table 53 for G, and a chromaticity value correction data table 54 for B are provided. Control circuit 44 for chromaticity value / illuminance value correction
Is an R, G, B / synchronous signal separation circuit 61 for inputting a video signal and separating each of R, G, B signals from a synchronizing signal, and an A for R
/ D converter 62, A / D converter 63 for G, A / D converter 64 for B, adders 65, 66, 67, D / A converter 68 for R, D / A converter 69 for G, and B
D / A converter 70, X / Y address generation counter 71, R liquid crystal driver 72, G liquid crystal driver 73, B liquid crystal driver 74, R liquid crystal panel 75, G liquid crystal panel 76, B liquid crystal panel 77. And

The correction data 80 received by the chromaticity / illuminance value correction data input unit 41 from the correction data output unit 33 is shown in FIG.
Has the format shown in FIG. This format is for transferring data by serial communication, and is roughly divided into a header 81 and a data block 82.
a to 82n and an end code 83. The header 81 is for recognizing that the correction data 80 has been transferred from the liquid crystal projector inspection apparatus 200.
It is used for synchronizing the timing of data transfer with 0. Each of the data blocks 82a to 82n contains the contents to be actually used as correction data, and is composed of each block number, its data type, and actual data. The data type is a data length or an identifier between chromaticity value data and illuminance value data. End code 8
Reference numeral 3 denotes a code for recognizing the end of data and checksum data.

The chromaticity value / illuminance value correction data calculation unit 42
The content of the correction data 80 received from the chromaticity value / illuminance value correction data input unit 41 is analyzed, and what kind of correction data should be stored in which data table of the chromaticity value / illuminance value correction data storage unit 43 is calculated. The respective correction data are stored in an illuminance value correction data table 51, an R chromaticity value correction data table 52, a G chromaticity value correction data table 53, and B
And the chromaticity correction data table 54 for use.
While the chromaticity value is defined by chromaticity coordinates X and Y, R,
The reason why the G and B chromaticity value correction data is generated is that the target actually controlled in the liquid crystal projector is the R, G and B primary color data.

The total number of pixels of the liquid crystal panel is 576 × 540 ×
3, the correction data of the illuminance value and the correction data of the chromaticity values of R, G, and B are respectively 576 × 540 = 311,
With 040 data, the illuminance value and the chromaticity value of each color can be corrected on a pixel-by-pixel basis, but the required storage capacity becomes very large, which is disadvantageous in cost. At present, it is not necessary to make such fine corrections. For this reason, as in the third embodiment described later, for example, if 64 × 60 pixels are divided into 9 × 9 = 81 blocks in units of blocks, and the correction is performed in units of blocks, the storage capacity is 81%. It is much less than 1/100. In this case, the chromaticity value / illuminance value correction data calculation unit 42 switches the calculation of the correction data in the X direction of the liquid crystal panel every 64 pixels, and switches the calculation of the correction data in the Y direction every 60 pixels. However, in the first embodiment,
The correction is performed in units of one pixel.

In the chromaticity value / illuminance value correction control circuit section 44, an R, G, B and synchronization signal separation circuit 61 receives a video signal, separates the R, G, and B video signals and separates them. A / D converter 62 for R and A / D converter 63 for G
To the A / D converter 64 for B, and separates the synchronization signal and outputs it to the X, Y address generation counter 71. The X, Y address generation counter 71 generates address counter data based on a synchronization signal input to control the X axis and Y axis of each liquid crystal panel, and stores each address counter data in the illuminance value correction data table 51. And R
The chromaticity value correction data table 52 for G, the chromaticity value correction data table for G 53, the chromaticity value correction data table 54 for B, the liquid crystal driver 72 for R, the liquid crystal driver 73 for G, and the liquid crystal driver 74 for B are output. Each correction data table 51
To 54 output the correction data of the corresponding address to the R, G, B adders 65, 66, 67 based on the input address counter data. The illuminance value correction data table 51 is output to all the adders 65, 66, 67. The R, G, and B image data converted from analog to digital by the A / D converter 62 for R, the A / D converter 63 for G, and the A / D converter 64 for B are respectively added to the adders 65, 66, and 67. , The illuminance value correction data are added respectively, and the chromaticity value correction data for R, G, and B are individually added, and the D /
A converter 68, D / A converter 69 for G and D for B
/ A converter 70, where the corrected R,
Each of the G and B digital image data is converted into an analog video signal and sent to the R liquid crystal driver 72, the G liquid crystal driver 73, and the B liquid crystal driver 74, respectively.
Each of the liquid crystal drivers 72, 73, and 74 controls driving of the R liquid crystal panel 75, the G liquid crystal panel 76, and the B liquid crystal panel 77 based on the corrected analog video signals. In this control, the illuminance value can be controlled by applying a voltage to each pixel of each liquid crystal panel at the same timing and synchronizing the scanning of the applied voltage between the liquid crystal panels. The chromaticity value can be controlled by using separate panels.

As shown in FIG.
When a solid white color image pattern for inspection / adjustment is projected from 0 to the screen 11, there is a maximum illuminance position 85 near the center of the projected image, and a concentric illuminance distribution 86 centered on the position 85. And tends to cause uneven illumination. 87a is the illuminance distribution in the X direction, and 87b
Is the illuminance distribution in the Y direction. In addition, color unevenness tends to occur partially on the screen 11. In the case of the prior art, it was impossible to make an adjustment for satisfactorily eliminating such uneven illuminance and color. In the case of the present embodiment, the entire projection image is divided into 9 × 9 = 81 blocks in multiples and correction is performed for each relatively narrow area. By the correction based on the correction data from 51, the illuminance distribution in the X direction can be made linear from the solid line 87a to the broken line 88a, and the illuminance distribution in the Y direction can be made linear from the solid line 87b to the broken line 88b. it can. That is, the illuminance distribution can be made uniform over the entire projected image. Similarly, R chromaticity value correction data table 5
2, the color unevenness can be eliminated by the correction based on the respective correction data from the chromaticity value correction data table 53 for G and the chromaticity value correction data table 54 for B. Although the storage capacity is increased, finer adjustments can be made as the number of divisions of the entire projection image is increased, and adjustment with the highest accuracy can be performed when correction is performed in units of one pixel.

The correction data of the illuminance value is used as an offset to the correction data of each chromaticity value in the chromaticity value correction data table 52 for R, the chromaticity value correction data table 53 for G, and the chromaticity value correction data table 54 for B. By adding in advance, the illuminance value correction data table 51 can be omitted.

As described above, since the inspection and adjustment of the chromaticity value and the illuminance value are performed in units of one pixel, the display quality without color and illuminance unevenness is extremely high not only in the entire projected image but also in a partial area. Adjustments can be made to the liquid crystal projector 300. However, it is refused in advance that there is no inferiority in inspection and adjustment in small block units in the third embodiment described later.

In the first embodiment, nine chromaticities
Using the illuminance sensor 12, the absolute chromaticity value and illuminance value of only a very small part, such as the sensor arrangement location on the screen 11, are measured. The chromaticity value and illuminance value of each pixel in the entire projected image on the screen 11
Acquire in 3. However, the chromaticity value and illuminance value of each pixel are relative and lack accuracy. Therefore, chromaticity
Based on the absolute chromaticity value / illuminance value of the illuminance sensor 12, the relative temporary chromaticity value / temporary illuminance value of each pixel is converted into an absolute chromaticity value / illuminance value. With this, while using a relatively small number of chromaticity / illuminance sensors 12, color unevenness / illuminance unevenness in the whole and partial areas of the projected image can be detected favorably, or color unevenness / illuminance unevenness can be eliminated. The optical engine can be adjusted. If the lamp unit is replaced after the life of the discharge tube has expired, the overall and partial color of the display screen will be the most suitable for the lamp unit, even if the lamp unit assembly adjustment accuracy and lamp characteristics vary. Unevenness / illuminance unevenness can be adjusted.

The technique of the first embodiment can be applied to any other embodiments as long as there is no logical contradiction.

[Second Embodiment] In the second embodiment, the absolute illuminance value, the absolute chromaticity X coordinate and the chromaticity Y coordinate for all the pixels registered in the absolute chromaticity value / illuminance value table T3 are set. Is another form of the calculation method. The basic configuration is the same as that of the first embodiment (FIGS. 1 and 2), and the operation is the same as that of the first embodiment (FIGS. 4, 8 to 10). In the case of the first embodiment, a common coefficient is used for all the pixels belonging to each of the blocks B _{1 to} B ₉ for each block. That is, using a common coefficient k ₁ for all pixels in the example, block B _1. On the other hand, in the case of the second embodiment, as shown in FIG. 12, coefficients are individually used for all pixels without being divided into blocks. An arbitrary pixel number in an area surrounded by the _four chromaticity / illuminance sensors 12 ₁ , 12 ₂ , 12 ₄ , and 12 ₅ is defined as A _ij . The coordinates of the pixel A _ij of the chromaticity-illuminance sensor 12 _first reference the origin and (j ', i'). The absolute illuminance values q _{1 to} q ₄ of the pixels are determined by proportional proportional division.

Q ₁ = Q ₉₀ , ₉₆ + j ′ / 192 ·
(Q ₉₀ , ₂₈₈ −Q ₉₀ , ₉₆ ) q ₂ = Q ₂₇₀ , ₉₆ + j ′ / 192 · (Q ₂₇₀ , ₂₈₈ −Q
_{270, 96) q 3 = Q} 90, 96 + i '/ 180 · (Q 270, 96 -Q 90,
_{96) q 4 = Q 90,} 288 + i '/ 180 · (Q 270, 288 -
Q ₉₀ , ₂₈₈ ), and the absolute illuminance value P ′ _ij at the pixel A _ij is calculated as P ′ _ij = (q ₁ + q ₂ + q ₃ + q ₄ ) / 4 by averaging processing. In the outside of the area can be determined absolute illuminance value P _'ij of an arbitrary pixel in the same manner by mirror-image operations. The same applies to the absolute chromaticity X coordinate X ' _ij and chromaticity Y coordinate Y' _ij . Other configurations and operations are the same as those in the first embodiment, and a description thereof will not be repeated. The technology of the second embodiment can be applied to any other embodiments as long as there is no logical contradiction.

Third Embodiment In the third embodiment, the absolute illuminance value, the absolute chromaticity X coordinate, and the chromaticity Y coordinate for all the pixels registered in the absolute chromaticity value / illuminance value table T3 are set. This is still another form of the calculation method. The basic configuration is the same as that of the first embodiment (FIGS. 1 and 2), and the operation is the same as that of the first embodiment (FIGS. 4, 8 to 10). In the case of the first embodiment, as shown in FIG.
The calculation was performed by dividing into large blocks B _{1 to} B ₉ of × 3 = 9. For the third embodiment with respect to this, × further 3 each block B ₁ .about.B ₉ as shown in FIG. 13 3 =
It is divided into nine small blocks. That is, C ₁₁ , C ₁₂ ,... C ₁₉ , C ₂₁ , C ₂₂ ,.
₂₉ ... _C91 , _C92 ,... _C99 are divided into small blocks of 9 × 9 = 81, coefficients are determined for each of the small blocks, and absolute illuminance values P ′ _{ij and the} like are calculated. The number of pixels in each small block is 64 × 60. Here a small nine constituting the block B ₅ of central block C _44, C _{45,
C 46, C 54, C 55} , C 56, C 64, each of the coefficient k ₄₄ for _{C 65, C 66, k 45} , k 46, k 54, k 55, k 56, k
Consider computing ₆₄ , k ₆₅ , and k ₆₆ . Center coefficient k
A coefficient vector V ₁ toward the coefficient k ₂ of the left from _5, from the center of the coefficient k ₅ and coefficient vector V ₂ toward the right of the coefficient k _8, the coefficient vector V extending from the center of the coefficient k ₅ on the upper side of the coefficients k _{4 3} and the lower coefficient k ₆ from the center coefficient k ₅
Consider the coefficient vector V ₄ toward the. Coefficient vector V
As _{1 ~V 4, V 1 = (} k 2 -k 5) / (288-96) = (k 2 -
k ₅ ) / 192 V ₂ = (k ₈ −k ₅ ) / 192 V ₃ = (k ₄ −k ₅ ) / (270−90) = (k ₂ −
k ₅₎ / 180 V ₄ = is defined as _{(k 6 -k 5) / 180} .

[0061] _{k 44 = (V 1/3} + V 3/3) / 2 k 45 = V 3/3 k 46 = (V 2/3 + V 3/3) / 2 k 54 = V 1/3 k 55 = k 5 _{k 56 = V 2/3 k} 64 = (V 1/3 + V 4/3) / 2 k 65 = V 4/3 k 66 = (V 2/3 + V 4/3) / 2 to become. Therefore, the absolute illuminance value P ′ _ij is given by P ′ _ij = k ₄₄ × P _ij (block C ₄₄ ) P ′ _ij = k ₄₅ × P _ij (block C ₄₅ ) P ′ _ij = k ₄₆ × P _ij ( block _{C 46) P 'ij = k} 54 × P ij ( block _{C 54) P' ij = k} 55 × P ij ( block _{C 55) P 'ij = k} 56 × P ij ( block C ₅₆₎ P' _ij = k ₆₄ × P _ij (block C ₆₄ ) P ′ _ij = k ₆₅ × P _ij (block C ₆₅ ) P ′ _ij = k ₆₆ × P _ij (block C ₆₆ ) It can be obtained an absolute intensity value P _'ij of an arbitrary pixel in the same vector coefficient processing for small blocks in each of the other blocks. The same applies to the absolute chromaticity X coordinate X ' _ij and chromaticity Y coordinate Y' _ij .
Other configurations and operations are the same as those in the first embodiment, and a description thereof will not be repeated.

The method of calculating the absolute illuminance value P ′ _ij and the absolute chromaticity X coordinate X ′ _ij and chromaticity Y coordinate Y ′ _ij in such a small block unit is merely an example. Various known methods can be applied as a method for calculating the absolute illuminance value, chromaticity X coordinate, and chromaticity Y coordinate in small block units.

The number of divisions into small blocks is represented by α _x × α _{Y where} the resolution of the color camera 13 is α _x × α _Y.
Is possible up to. For example, if the resolution is 512 × 512, it can be divided into small blocks of 512 × 512. The greater the number of divisions, the more accurate the absolute illuminance value P ' _ij and the absolute chromaticity X coordinate X' _ij and chromaticity Y coordinate Y ' _ij can be calculated, but the processing time is increased accordingly. In addition, the required storage capacity increases. However, 9x
Even the division into nine small blocks is sufficient to eliminate uneven illumination and uneven color. Of course, 9 × 9 is only an example, and arbitrary natural numbers of 2 or more are defined as a and b.
It can be divided into small blocks of a × b.

Here, the updating of the correction conditions by the chromaticity value / illuminance value correction data calculation unit 42 and the chromaticity value / illuminance value correction data storage unit 43 will be described. The adjustment by this update includes a macro adjustment and a micro adjustment. In the macro adjustment, the relative illuminance value and chromaticity value between blocks are not changed much, and the overall adjustment amount is equivalently changed by increasing or decreasing the absolute value as a whole and within the standard range. Adjust to In this case, the adjustment is easy, but when some blocks are not well-balanced, the adjustment is difficult. In the micro adjustment, the adjustment is performed within the standard range in block units, and fine adjustment with higher quality than the macro adjustment is possible. However, since this is a block-by-block adjustment,
The adjustment process takes some time.

As described above, since the inspection and adjustment of the chromaticity value and the illuminance value are performed in small block units, the first embodiment can be applied not only to the entire projected image but also to a partial area.
In the case of (1), it is possible to adjust the liquid crystal projector 300 to an extremely high display quality with no color unevenness and illuminance unevenness in a state comparable to the inspection and adjustment for each pixel.

The technique of the third embodiment can be applied to any other embodiments as long as there is no logical contradiction.

[Embodiment 4] The chromaticity / illuminance sensor 12 and the screen 11 are optically made of different materials. The screen 1 of the image projected from the liquid crystal projector 300
1 is in the original display state, but the image portion on the chromaticity / illuminance sensor 12 is changed. Therefore, the image data obtained when the part is captured by the color camera 13 is different from the original image data. Has an error in the image data. Embodiment 4 eliminates this inconvenience.

As shown in FIGS. 14A, 14B, and 14C, a screen 11 having a plurality of chromaticity / illuminance sensors 12 is projected onto an image projection area 9 from a liquid crystal projector 300.
1 is moved in the horizontal direction as indicated by a thick arrow.
Reference numeral 92 denotes an imaging area of the color camera 13. Figure (a)
Shows a state before the movement, and FIG. 2B shows a state after the movement in the arrow direction. FIG. 3C schematically shows both states of FIGS. 3A and 3B, where a solid line corresponds to FIG. 5A and a broken line corresponds to FIG. 5B. In the state before the movement in FIG.
The centers (diagonal intersections) of the screen 11, the image projection area 91, and the imaging area 92 match each other. In this state, the chromaticity / illuminance signal captured by the chromaticity / illuminance sensor 12 is valid. Also, of the image data captured by the color camera 13, data of a portion other than the chromaticity / illuminance sensor 12 is made valid, and data of a portion of the chromaticity / illuminance sensor 12 is made invalid. As a result, the data of the video portion 91a projected on the portion of the chromaticity / illuminance sensor 12 is lost. Then, the screen 11 is moved as shown in FIG. 3B, and the color camera 13 takes in the image data again. At this time, the image portion 91a projected on the portion of the chromaticity / illuminance sensor 12 in the state of FIG. 9A is projected on the screen 11 instead of the chromaticity / illuminance sensor 12,
The image data of the original video is captured by the color camera 13. This makes up for the missing data. At this time, the chromaticity / illuminance sensor 12 does not take in the chromaticity / illuminance signals.

The screen 11 may be fixed, and the liquid crystal projector 300 and the color camera 13 may be moved. It should be noted that the image projection area 91 of the liquid crystal projector 300 and the imaging area 92 of the color camera 13 must always correspond one-to-one. In view of this point, it is easier to move the screen 11. In the above description, the movement is performed in the horizontal direction, but the movement may be performed in the vertical direction. In some cases, it may be possible to move in an oblique direction. The technology of the fourth embodiment can be applied to any other embodiments as long as there is no logical contradiction.

[Fifth Embodiment] A fifth embodiment is another solution to the occurrence of an error in the image data of the projected image on the chromaticity / illuminance sensor 12. As shown in FIG. 15, an electric screen 94 is provided separately from the screen 11 with the chromaticity / illuminance sensor 12. The electric screen 94 includes a storage portion 94a, a white screen 94b that can be rolled up, stored, and unfolded, and a driving motor (not shown) and a driving circuit. When collecting the data of the chromaticity value and the illuminance value by the chromaticity / illuminance sensor 12, the screen 94b is stored in the storage portion 94a. When the process is completed, the process moves to the collection of image data by the color camera 13, but before that, the electric screen 94 is driven to
The screen 94 b is extended to the front of the screen 11 with the chromaticity / illuminance sensor 12 and developed, and image data from the color camera 13 is collected. The technology of the fifth embodiment can be applied to any other embodiments as long as there is no logical contradiction.

[Embodiment 6] Embodiment 6 relates to chromaticity and illumination.
Error occurs in the image data of the projected video on the
Is another solution to that. As shown in FIG.
8 small correction blowers around the chromaticity / illuminance sensor 12
Dock₁₁~ D₃₃Set. One small correction block
The size is, for example, 16 × 16 pixels. Small block for correction
D₁₁256 image data R in_ij, G_ij, B
_ij(More specifically, R_ij, R _11-11 , R
_11-12 …… R_11-1,₁₆ , R_11-21 , R_11-22 …… R
_11-2,₁₆ ……………… R_11-16,₁ , R_11-16,_Two ......
R_11-16,₁₆Of 256) (R_11-AVE, G
_11-AVE, B_11-AVE), And similarly, the correction small block D
₁₂, D₁₃, D_{twenty one}, D_{twenty three}, D₃₁, D₃₂, D₃₃Each flat
Average value (R_12-AVE, G_12-AVE, B_12-AVE), (R_13-AVE,
G_13-AVE, B_13-AVE), (R_21-AVE, G_21-AVE, B
_21-AVE), (R_23-AVE, G_23-AVE, B_23-AVE), (R
_31-AVE, G_31-AVE, B_31-AVE), (R_32-AVE,
G_32-AVE, B_32-AVE), (R_33-AVE, G_33-AVE, B
_33-AVE)I take the. Hereinafter, in order to avoid complication, R
Is described only. Eight average values R obtained_11-AVE, R
_12-AVE, R_13-AVE, R_21-AVE, R_23-AVE, R_31-AVE, R
_32-AVE, R_33-AVEBy taking the average value of
Image of the image portion projected on the portion of the degree sensor 12
Let it be image data. The same applies to G and B. More
In this method, the correction small block D₁₁~ D₃₃Of 1
It is not necessary to take the average value every time.
Lock D₁₁~ D₃₃Average of all pixels (for 2,048)
It is equivalent to take the value directly.

Of the eight correction small blocks D _{11 to} D ₃₃ , four correction small blocks D ₁₂ , D ₃₂ , D ₂₁ , upper, lower, left and right
It may be the image data of the sensor portion by taking the average value of D _23.

Embodiment 4 for Moving Screen 11
Compared to the case of Embodiment 5 or Embodiment 5 using the electric screen 94, the image data of the sensor portion can be obtained by electronically processing the image data, and the time required for the processing is much shorter. In the case of Embodiments 4 and 5, 1 to
In contrast to the case where it takes about 3 seconds, in the case of the sixth embodiment, it takes only several msec to several hundred msec. The technology of the sixth embodiment can be applied to any other embodiments as long as there is no logical contradiction.

[0074] As shown in (a) of Seventh Embodiment FIG. 17, to set only one block D ₂₂ of 16 × 16 pixels of conditions including chromaticity-illuminance sensor 12. Then, the inside is subdivided to set eight micro blocks E _{11 to} E ₃₃ . Of course, these minute blocks do not include the pixels corresponding to the chromaticity / illuminance sensor 12. By executing the same processing as that in the sixth embodiment for this small block, image data of the sensor portion is obtained. Alternatively, as shown in (b) of FIG. 17, small block without setting the average value of the image data in the region E ₀₀ excluding the pixels corresponding to the chromaticity-illuminance sensor 12 in the block D ₂₂ You may take.

As compared with the sixth embodiment, since image data of a portion closer to the chromaticity / illuminance sensor 12 is used and the number of image data to be used is smaller, high-speed processing is possible.

Taking this into consideration, coarse adjustment by electronic processing according to the sixth or seventh embodiment is performed up to the vicinity of the standard value. The fine adjustment using the electric screen according to the fifth embodiment may be performed. Then, the adjustment time can be reduced while ensuring the adjustment accuracy.

The technique of the seventh embodiment can be applied to any other embodiments as long as there is no logical contradiction.

[Eighth Embodiment] In an eighth embodiment, correction data of the chromaticity value and the illuminance value of the lamp unit is taken in from the outside. FIG. 18 shows the system. Input / output interface 100 for auxiliary storage device 34 in liquid crystal projector inspection device 200
Is a maker database 4 via the telephone line 401
00, a telephone line input / output terminal 101 for inputting / outputting correction data to / from an IC card 402, an IC card input / output terminal 102 for inputting / outputting correction data to / from an IC card 402, and a correction between a floppy disk 403. A floppy disk input / output terminal 103 for inputting / outputting data;
And an optical disk input / output terminal 104 for inputting and outputting correction data to and from the auxiliary storage device 34 such as a hard disk. I have.

The manufacturer of the lamp unit inspects the characteristics of the manufactured lamp unit, and prints a manufacturing number on the lamp unit if the lamp unit is non-defective. In addition, the inspection data is transferred to a host computer or the like together with the manufacturing number, and the inspection data is managed by the host computer. This is the database 400.

When the lamp unit is replaced, the production number printed on the lamp unit is read, and the switch 105 is switched to the telephone line input / output terminal 101. A database 400 of a maker's host computer is accessed via the communication line 101 and the telephone line 401, and chromaticity value / illuminance value correction data corresponding to the lamp unit is downloaded to the auxiliary storage device 34 therefrom. Although not shown, a modem, an NCU (network control unit), or the like is inserted between the telephone line input / output terminal 101 and the switch 105 or between the switch 105 and the auxiliary storage device 34. I have. In this case, the correction data of the lamp unit can be centrally managed, and there is no need to attach an auxiliary storage medium such as an IC card, a floppy disk, or an optical disk to the lamp unit.

In some cases, the IC card 402 may be used. In this case, the switch 105 is switched to the IC card input / output terminal 102, and the chromaticity value / illuminance value correction data for the lamp unit read from the IC card 402 is downloaded to the auxiliary storage device 34.
Downloading from an IC card can be performed at high speed. Also,
In some cases, the floppy disk 403 or the optical disk 404 may be used. The switch 105 is switched to the floppy disk input / output terminal 103 or the optical disk input / output terminal 104, and the chromaticity value / illuminance value correction data for the lamp unit reproduced from the floppy disk 403 or the optical disk 404 is downloaded to the auxiliary storage device.

The switching unit 105 may be of a type that automatically performs a switching operation by a function of determining the type of a signal.

The correction data of the chromaticity value / illuminance value of the lamp unit downloaded to the auxiliary storage device 34 as described above is transferred to the liquid crystal projector 300 via the correction data output section 33. LCD projector 300
Of the chromaticity value / illuminance value correction data input unit 41, the chromaticity value / illuminance value correction data calculation unit 42, the chromaticity value / illuminance value correction data storage unit 43, and the chromaticity value / illuminance value correction control circuit unit 44 The functions have already been described, and the chromaticity value and illuminance value can be adjusted for the whole or part of the projected image, eliminating unevenness in color and illuminance caused by replacing the lamp unit, and improving display quality. can do.

The data in the auxiliary storage device 34 is transferred to the database 400, the IC card 402, the floppy disk 4
03, optical disk 404 such as MD, CD-R and DVD
Can also be written to. The technology of the eighth embodiment can be applied to any other embodiments as long as there is no logical contradiction.

Ninth Embodiment In a ninth embodiment, in the liquid crystal projector 300, correction data of the chromaticity value and the illuminance value of the lamp unit is taken in from the outside. FIG. 19 shows the system. Input / output interface 15 in liquid crystal projector 300
Reference numeral 0 denotes a telephone line input / output terminal 151 for inputting / outputting correction data to / from the manufacturer database 400 via the telephone line 401, and an IC card input / output terminal for inputting / outputting correction data to / from the IC card 402. A terminal 152; a floppy disk input / output terminal 153 for inputting / outputting correction data between the floppy disk 403;
04, an optical disk input / output terminal 154 for inputting / outputting correction data from / to the audio tape 405, an audio signal input terminal 155 for inputting correction data from the audio tape 405, and a video signal input terminal 1 for inputting correction data from the video tape 406.
56, a dedicated signal input / output terminal 157 for inputting and outputting correction data between the auxiliary storage device 34 of the liquid crystal projector inspection apparatus 200 and the correction data output unit 33,
LCD projector 3
A switch 158 for selectively switching and connecting to the chromaticity value / illuminance value correction data input unit 41 of 00 is provided. Reference numeral 41 denotes a chromaticity value / illuminance value correction data input section for inputting and storing correction data, and 42 denotes a control amount necessary for controlling the liquid crystal panel of the optical engine in the optical module 301 based on the input correction data. A chromaticity value / illuminance value correction data calculation unit 43 for converting the chromaticity value / illuminance value stores correction data for correcting the chromaticity value / illuminance value of each pixel in the entire projected image on the screen 11. A value correction data storage unit 44 is a chromaticity value / illuminance value correction control that performs control based on the correction data so that the chromaticity value / illuminance value of each pixel in the entire area of the image projected on the screen becomes uniform. It is a circuit part.

The process for replacing the lamp unit is the same as that of the eighth embodiment when using the telephone line 401, IC card 402, floppy disk 403 or optical disk 404. However, the downloaded correction data is output from the switch 158 to the chromaticity value / illuminance value correction data input unit 41. When using the audio tape 405, the switch 158 is switched to the audio signal input terminal 155, and the audio tape 405 is used.
Is output to the chromaticity value / illuminance value correction data input unit 41 via the switch 158. When using the video tape 406, the switch 158 is switched to the video signal input terminal 156, and the video tape 40 is used.
6 is output to the chromaticity value / illuminance value correction data input unit 41 via the switch 158. It is assumed that correction data is recorded in digital form on an audio tape or video tape. However, it may be recorded in analog. In that case, an A / D converter is inserted between the audio signal input terminal or the video signal input terminal and the switch 158. Audio decks and VCRs are common in ordinary households. There is the convenience of taking in the correction data using it. When inspecting / adjusting the color unevenness and the illuminance unevenness in the manufacturing process of the liquid crystal projector 300, the dedicated signal input / output terminal 157 is required when the liquid crystal projector inspection apparatus 200 is used.
Use Alternatively, the correction data downloaded from the outside may be transferred to the auxiliary storage device 34 via the switch 158, the dedicated signal input / output terminal 157, and the correction data output unit 33 and stored. Embodiment 9
The technique described in the above can be applied to any other embodiments as long as there is no logical contradiction.

[Embodiment 10] Embodiment 10 relates to inspection / adjustment of only the illuminance value. FIG. 20 shows the configuration. A monochrome camera 13a is used instead of the color camera. In addition, each part is changed from a chromaticity value / illuminance value to an illuminance value only. 12a is an illuminance sensor, 21a is an illuminance sensor input unit, 22a is an illuminance value measurement unit, 24a is a temporary illuminance value table creation unit, 26a is an illuminance value correction coefficient operation unit, 27a is an absolute illuminance value operation unit, and 41a is an illuminance value Correction data input section,
Reference numeral 42a denotes an illuminance value correction data operation unit, 43a denotes an illuminance value correction data storage unit, 44a denotes an illuminance value correction control circuit unit, and the other configurations are the same as those of the first embodiment (FIG. 1). Only the same reference numerals are given to the parts, and the description is omitted. In the case of the tenth embodiment, it is possible to detect uneven illuminance of the whole or a part of the projected image and eliminate the uneven illuminance. Monochrome camera 13a for entire projected image
, The spatial resolution is tripled compared to a color camera, the inspection and adjustment of the illuminance value can be performed with higher accuracy, the circuit configuration is simplified, the processing time is shortened, and the cost is reduced. Down can be achieved.

The cause of the color unevenness is considered to be mainly the improper mounting adjustment of the liquid crystal panel of the optical module 301 or the improper installation of the lamp unit. Inspection and adjustment of only the illuminance value is meaningful in dealing with replacement of the lamp unit. Of course, a configuration may be adopted in which inspection and adjustment of only the chromaticity value are performed.

The technique of the tenth embodiment can be applied to any other embodiments as long as there is no logical contradiction.

While the embodiments have been described above, the present invention includes the following embodiments.

(1) In the above embodiment, the number of the chromaticity / illuminance sensors 12 is set to 3 × 3 = 9. However, the present invention is not limited to this. , Where N is an arbitrary value of the number of arrays in the horizontal direction, and M × N chromaticities
An illuminance sensor may be provided. The same applies to only the illuminance sensor 12a.

(2) Instead of the chromaticity / illuminance sensor 12, a chromaticity sensor that measures only chromaticity may be used, or an illuminance sensor that measures only illuminance may be used. . In general, many types of chromaticity sensors can generally measure illuminance.

(3) FIG. 2 using only the illuminance sensor 12a
Even in the case of 0, the liquid crystal projector 300 includes a chromaticity value / illuminance value correction data input unit 41 and a chromaticity value / illuminance value correction data calculation unit 4 to cope with lamp unit replacement.
2. A chromaticity / illuminance value correction data storage unit 43 and a chromaticity / illuminance value correction control circuit unit 44 may be provided.

The above items (1) to (3) are independent from each other, and any of these items may be appropriately combined in an appropriate number. It is good to apply to the form.

[0095] Words representing individual components described in the claims, words representing the connection relationship between the components,
All arbitrary words, including words representing each state, each action, each action, each process, etc., are merely expressions for convenience of explanation, and therefore should not be interpreted restrictively in any way. It must be construed that all equivalent expressions are included without departing from the spirit of the technical idea of the present invention, or the meaning of each word must be interpreted in the broadest sense. The words in the section of the means for solving the problems and the section of the effect of the invention should be interpreted in the same manner. Above all, "screen"
"Optical sensor""Illuminancesensor""Chromaticity / Illuminance sensor"
The terms “projection image”, “imaging data”, “optical quantity”, “chromaticity value”, “illuminance value”, “correction data”, “video projection device”, and “liquid crystal projector” must be interpreted as such. The “inspection” of the “projection image inspection device” of the name of the invention is
In a broad sense, it means both inspection only and adjustment.

[0096]

According to the present invention regarding the projection image inspection apparatus (liquid crystal projector inspection apparatus), the optical amount (relative temporary provision) of the portion corresponding to the position of the optical sensor (chromaticity / illuminance sensor) in the image data is obtained. The chromaticity value / temporary illuminance value) is converted to the absolute optical amount (chromaticity value /
Illuminance value) to obtain a parameter, and based on the parameter, determine the relative optical amount (temporary chromaticity value / temporary illuminance value) of the projected image based on the absolute optical amount (chromaticity value / illuminance value). , Accurate inspection can be performed, and optical unevenness (color unevenness / illuminance unevenness) can be detected in the entire and partial areas of the projected image. The number of necessary optical sensors (chromaticity / illuminance sensors) may be small.

Further, the chromaticity value / illuminance value of the optical system of the video projection device (liquid crystal projector) is corrected based on the correction data generated by comparing the absolute chromaticity value / illuminance value with the reference data. The optical characteristics of the video projector (liquid crystal projector) can be made appropriate.

When the optical sensor is an illuminance sensor and the camera is a monochrome camera, the spatial resolution can be increased, the circuit configuration can be simplified, the processing speed can be increased, and the cost can be reduced.

Further, by displacing the screen relative to the image projecting device / imaging means, or by arranging another normal screen so as to be able to move back and forth with respect to the front surface of the screen having the optical sensor, the optical sensor Corrects the image data at the mounting position and eliminates the inconvenience that the projected image on the optical sensor is in a different state from the original projected image due to the optical characteristics of the optical sensor. Can be inspected and adjusted.

When the lamp unit is replaced,
Since the chromaticity value / illuminance value of the optical system of the video projector is corrected by inputting correction data specific to the lamp unit, it can be adjusted to a state that matches the optical characteristics of the lamp unit, and color unevenness and illuminance unevenness can be adjusted. Can be eliminated.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing a schematic configuration of a liquid crystal projector inspection device and a liquid crystal projector according to a first embodiment of a projection image inspection device of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a liquid crystal projector according to the first embodiment.

FIG. 3 is a schematic diagram illustrating a relationship between image data and relative temporary chromaticity values / temporary illuminance values and absolute chromaticity values / illuminance values of respective pixels on a screen according to the first embodiment;

FIG. 4 is a schematic diagram of an RGB data table, a temporary chromaticity value / temporary illuminance value table, and an absolute chromaticity value / illuminance value table constructed in an image memory according to the first embodiment;

FIG. 5 is a schematic diagram showing a relationship between image data and relative provisional chromaticity values and provisional illuminance values and absolute chromaticity values and illuminance values for each pixel on a screen according to the first embodiment;

FIG. 6 is a state diagram of a data memory for an illuminance value in the first embodiment.

FIG. 7 is a format of correction data according to the first embodiment.

FIG. 8 is a flowchart of a process of creating reference data according to the first embodiment.

FIG. 9 is a flowchart of a process for creating correction data for the lamp unit to be adjusted in the first embodiment.

FIG. 10 is a flowchart of a subroutine of a process of creating measurement data in the case of the first embodiment.

FIG. 11 is an explanatory diagram of eliminating uneven illuminance according to the first embodiment;

FIG. 12 is a schematic diagram illustrating a method of calculating absolute chromaticity values and illuminance values in the case of the liquid crystal projector inspection apparatus according to the second embodiment.

FIG. 13 is a schematic diagram illustrating a method of calculating absolute chromaticity values and illuminance values in the case of the liquid crystal projector inspection apparatus according to the third embodiment.

FIG. 14 is an explanatory diagram of a relative displacement between a screen and an image projection area / imaging area of the liquid crystal projector inspection apparatus according to the fourth embodiment.

FIG. 15 is a side view showing a screen and a motorized screen of the liquid crystal projector inspection apparatus according to the fifth embodiment.

FIG. 16 is an explanatory diagram of a method for solving an error generated in image data of a projected video in the liquid crystal projector inspection apparatus according to the sixth embodiment.

FIG. 17 is an explanatory diagram of a method for solving an error generated in image data of a projected video in the liquid crystal projector inspection apparatus according to the seventh embodiment.

FIG. 18 is a block diagram showing elements for taking in correction data from outside in the liquid crystal projector inspection apparatus according to the eighth embodiment.

FIG. 19 is a block diagram showing elements for taking in correction data from outside in the liquid crystal projector according to the ninth embodiment.

FIG. 20 is a system configuration diagram showing a configuration of a monochrome type (only illuminance value) liquid crystal projector inspection apparatus and a liquid crystal projector according to the tenth embodiment.

FIG. 21 is a sectional view showing a schematic structure of a lamp unit.

FIG. 22 is a block diagram showing a schematic configuration of a liquid crystal projector inspection apparatus according to a conventional technique.

[Explanation of symbols]

11 Screen 12 Chromaticity
Illuminance sensor 12a: Illuminance sensor 13: Color camera 13a: Monochrome camera 21: Chromaticity
Illuminance sensor input unit 22: Chromaticity value / illuminance value measurement unit 23: Image input unit 24: Temporary chromaticity value / temporary illuminance value table creation unit 25: Sensor position data extraction unit 26: Chromaticity value Illuminance value correction coefficient calculation unit 27: Absolute chromaticity value / illuminance value calculation unit 28: Reference data storage unit 29: Measurement result comparison and determination unit 30: Measurement result output unit 31: Correction data creation unit 32 ··· Correction data storage unit 33 ··· Correction data output unit 34 ··· Auxiliary storage device 41 ··· Chromaticity value / illuminance value correction data input unit 42 ··· Chromaticity value / illuminance value correction data calculation unit 43 ··· Illumination value correction data storage unit 44: Chromaticity value / illuminance value correction control circuit unit 21a: Illuminance sensor input unit 22a: Illuminance value measurement unit 24a: Temporary illuminance value table creation unit 26a: Illuminance value correction Coefficient calculation unit 27a: Absolute illuminance value performance Calculation unit 41a Illumination value correction data input unit 42a Illumination value correction data calculation unit 43a Illumination value correction data storage unit 44a Illuminance value correction control circuit unit 80 Correction data 91 Image projection area 92: imaging area 94: electric screen 200: liquid crystal projector inspection device 300: liquid crystal projector 301: optical module T1: RGB data table T2: temporary color value / temporary illuminance value table T3: absolute Chromaticity value / Illuminance value table

Claims (9)

[Claims] 1. An absolute optical amount of a projected image based on a comparison between an optical amount of an optical sensor arranged on a screen and an optical amount of a portion corresponding to the optical sensor in imaging data of the projected image on the screen. And a projection image inspection device configured to output the measurement result. 2. The optical sensor is a chromaticity / illuminance sensor,
The imaging data is from a color camera, and the relative temporary chromaticity value / temporary illuminance value based on the imaging data is converted into an absolute chromaticity value / illuminance value by the chromaticity / illuminance value by the chromaticity / illuminance sensor. The projection image inspection apparatus according to claim 1, wherein the projection image inspection apparatus is configured to perform conversion. 3. The apparatus according to claim 1, wherein correction data is created by comparing the absolute chromaticity value / illuminance value with the reference data, and the chromaticity value / illuminance value of the optical system of the video projection device is corrected. Item 3. A projection image inspection device according to Item 2. 4. The optical sensor is an illuminance sensor, the imaging data is from a monochrome camera, and a relative temporary illuminance value based on the imaging data is converted into an absolute illuminance value by the illuminance value from the illuminance sensor. The projection image inspection apparatus according to claim 1, wherein the projection image inspection apparatus is configured as follows. 5. The projection image inspection according to claim 4, wherein correction data is created by comparing the absolute illuminance value with the reference data, and the illuminance value of the optical system of the image projection device is corrected. apparatus. 6. The image processing apparatus according to claim 1, wherein the screen, the image projection device, and the imaging unit are configured to be relatively displaceable, and configured to correct the imaging data of the optical sensor mounting position. A projection image inspection apparatus according to any one of the above. 7. An apparatus according to claim 1, wherein another ordinary screen is configured so as to be able to move back and forth with respect to the front surface of the screen with the optical sensor, and the image data at the position where the optical sensor is mounted is corrected. 6. The projection image inspection apparatus according to any one of 5 to 5. 8. The video projector according to claim 3, wherein correction data specific to the lamp unit is inputted to correct the illuminance value or the chromaticity value / illuminance value of the optical system of the image projection apparatus. Projection image inspection equipment. 9. The projection image inspection device according to claim 1, wherein the image projection device is a liquid crystal projector.