JP2022160498A - Projection controller, projector, projection control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain projection operation with high picture quality while adapting to a change of environment light.

SOLUTION: The present invention comprises: an input processing unit 21 for inputting an image signal; a projection unit PJ for projecting an image that corresponds to the inputted image signal; an imaging unit IM for acquiring average illuminance on a surface to be projected by the projection unit PJ; and a CPU 33 for causing the average luminance of an inputted image signal to be acquired by a projection image drive unit 22, and changing/setting a projection condition for projection by the projection unit PJ on the basis of the acquired average luminance and average illuminance.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to a projection control device, a projection device, a projection control method, and a program.

In order to provide an environment-adaptive image display system, etc., a technology that corrects colors to increase the output of at least the low gradation range and corrects to increase the brightness when there is an influence of environmental light. is proposed. (For example, Patent Document 1)

JP 2002-125125 A

In the technique described in the above-mentioned patent document, a period for projecting primary color light such as white light is provided, and the reflected light when the primary color light is projected onto the screen is measured by a color light sensor, so that the influence of environmental light on the projected image can be determined. is calculated. However, it is difficult to imagine that the operation of projecting the primary color light will be interrupted during the process of actually selecting and projecting some kind of video signal, such as a video for presentation, and the projector will continue to operate. This is considered to be an operation that should be executed as an initial setting when the device is installed. Therefore, it is difficult to respond immediately in situations where the influence of environmental light changes, such as at an installation location that is affected by outside light.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its object is to provide a projection control apparatus and a projection apparatus capable of maintaining projection operation with high image quality while adapting to changes in ambient light. , to provide a projection control method and program.

A projection control apparatus according to an aspect of the present invention is configured such that an image signal acquisition unit that acquires an image signal and a projection unit that projects an image project an image corresponding to the image signal acquired by the image signal acquisition unit. projection control means for controlling; first brightness acquisition means for acquiring first brightness information including average brightness information in the image plane according to the image signal acquired by the image signal acquisition means; an imaging means for capturing an image of a projection surface including a normal image projected by the projection unit and the projection surface corresponding to the first brightness information projected by the projection unit at each acquisition timing set in advance; second brightness acquisition means for acquiring second brightness information including average brightness information from the image captured by the imaging means; the first brightness information and the second brightness; projection condition setting means for changing and setting projection conditions in the projection unit based on the information.

According to the present invention, it is possible to maintain projection operation with high image quality while adapting to changes in ambient light.

1 is a block diagram showing the functional configuration of an electronic circuit of a projector device according to an embodiment of the invention; FIG. 4 is a flow chart showing the contents of processing executed in parallel with the projection operation according to the embodiment; FIG. 10 is a diagram showing the relationship between the average luminance of input image signals and average illuminance on the projection plane and estimated contrast according to the embodiment;

An embodiment in which the present invention is applied to a projector apparatus will be described in detail below with reference to the drawings.
FIG. 1 is a block diagram mainly showing the functional configuration of an electronic circuit of a DLP (registered trademark) (Digital Light Processing) type projector apparatus 10 according to the present embodiment. In the figure, the input processing unit 21 includes, for example, a pin jack (RCA) type video input terminal, a D-sub15 type RGB input terminal, an HDMI (registered trademark) (High-Definition Multimedia Interface) terminal, and a USB (Universal Serial Bus). ) terminals.

Analog or digital image signals of various standards, which are input to the input processing unit 21 or stored in the USB memory and selectively read out, are digitized by the input processing unit 21 as necessary, and then sent to the system bus. It is sent to the projection image driving section 22 via the SB. The projection unit PJ includes the projection image driving unit 22, a micromirror element 23, a light source unit 24, a mirror 25, a projection lens unit 26, and a lens motor (M) 27.

The projection image driving unit 22 selects a frame rate according to a predetermined format, for example, 120 [frames/second] if the input image data is 60 [Hz], according to the sent image data. The micromirror element 23, which is a display element, is driven for display by higher-speed time-division driving obtained by multiplying the number of divisions and the number of display gradations.

The micromirror element 23 performs a display operation by turning on/off each inclination angle of a plurality of micromirrors arranged in an array, for example, 1280 horizontal pixels by 960 vertical pixels (aspect ratio 4:3). By doing so, an optical image is formed by the reflected light.

On the other hand, the primary color lights of R, G, and B are cyclically emitted from the light source unit 24 in a time division manner. The light source unit 24 has LEDs (light emitting diodes), which are semiconductor light emitting elements, and repeatedly emits primary color lights of R, G, and B in a time division manner. The LEDs included in the light source unit 24 may include LDs (semiconductor lasers) and organic EL elements as LEDs in a broad sense. The primary color light from the light source unit 24 is totally reflected by the mirror 25 and irradiated to the micromirror element 23 .

A light image is formed by the light reflected by the micromirror element 23, and the formed light image is projected outside through the projection lens unit 26 to be displayed on the projection target surface.

The projection lens unit 26 includes a focus lens for moving the focus position and a zoom lens for varying the zoom (projection) angle of view in the internal lens optical system. A position along the optical axis direction is selectively driven by 27 via a gear mechanism (not shown).

On the other hand, the projector apparatus 10 is provided with an imaging section IM that photographs the projection direction of the projection lens section 26 . This photographing unit IM has a photographing lens unit 28 . The photographing lens unit 28 includes a zoom lens for varying the photographing angle of view and a focus lens for moving the focus position. In consideration of the parallax, it has a photographing angle of view slightly larger than the projection angle of view emitted when the projection lens unit 26 has the widest angle. An external light image incident on the photographing lens unit 28 is imaged on a CMOS image sensor 29, which is a solid-state imaging device.

An image signal obtained by image formation by the CMOS image sensor 29 is digitized by the A/D converter 30 and then sent to the captured image processing section 31 .

The photographed image processing unit 31 scan-drives the CMOS image sensor 29 to perform a photographing operation, and performs image processing on the image data obtained by photographing, thereby extracting and extracting the projection range of the projection unit PJ. Calculation of average illuminance (second brightness information) within the projection range is executed. In addition, the photographed image processing section 31 drives a lens motor (M) 32 for moving the focus lens position of the photographing lens section 28 .

The CPU 33 controls all operations of the above circuits. This CPU 33 is directly connected to a main memory 34 and a program memory 35 . The main memory 34 is composed of SRAM, for example, and functions as a work memory for the CPU 33 . The program memory 35 is composed of an electrically rewritable non-volatile memory such as a flash ROM, and stores an operation program executed by the CPU 33 and various fixed data such as an OSD (On Screen Display) image superimposed on a base image. memorize

The CPU 33 reads the operation program, fixed form data, and the like stored in the program memory 35, develops and retains them in the main memory 34, and executes the programs, thereby controlling the projector device 10 as a whole. do.

The CPU 33 executes various projection operations according to operation signals from the operation unit 36 . The operation unit 36 includes operation keys provided on the main housing of the projector device 10 or a light receiving unit that receives infrared modulation signals from a remote controller dedicated to the projector device 10 (not shown), and receives key operation signals. A signal corresponding to the key operation signal is sent to the CPU 33 .

The CPU 33 is further connected to the audio processing section 37 via the system bus SB.
The audio processing unit 37 includes a sound source circuit such as a PCM sound source, converts an audio signal applied during the projection operation into an analog signal, and drives the speaker unit 38 to emit a sound or generate a beep sound or the like as necessary.

[motion]
Next, the operation of the above embodiment will be described.
In the initial setting of the projection operation, the user of the projector device 10 operates the zoom lens in the projection lens unit 26 of the projection unit PJ to set a desired projection angle of view, and also sets a screen (not shown) to be projected. Alternatively, it is assumed that the autofocus instruction for the curtain is operated in advance.

By moving the zoom lens of the imaging lens unit 28 of the imaging unit IM in conjunction with the operation of the zoom lens of the projection lens unit 26 of the projection unit PJ, the range of the image projected by the projection unit PJ can be ensured. The photographing angle of view of the photographing lens unit 28 is set so as to cover the distance from the position of the focus lens to the object to be projected by the autofocus operation of the photographed image by driving the focus lens of the photographing lens unit 28. can be obtained.

Therefore, after setting the position of the focus lens on the projection lens unit 26 side of the projection unit PJ at the same distance, finely adjust the position of the focus lens of the projection lens unit 26 while monitoring the image captured by the imaging unit IM. , it is possible to achieve accurate autofocus adjustment of the projected image.

FIG. 2 shows the emission luminance of the LED for each primary color light of the light source unit 24 and the micromirror element, which is executed in parallel with the projection operation according to the image signal input to the input processing unit 21 in the projector device 10 . 23 is a flow chart showing details of processing for setting light emission luminance in the projection unit PJ by tone adjustment of an image displayed in step 23. FIG.

The setting processing of the emission brightness in the projection unit PJ is executed by the CPU 33, the captured image processing unit 31 of the imaging unit IM operating under the control of the CPU 33, and the projected image driving unit 22 of the projection unit PJ.

At the beginning of processing, the CPU 33 determines that the number of image frames counted is a multiple of 120 if the frame rate of the image signal input to the input processing unit 21 at that time is 120 [frames/second]. By repeatedly determining whether or not the acquisition timing has come once in one [second], it waits for the timing (step S101).

When it is determined that the above acquisition timing has come (Yes in step S101), the CPU 33 causes the photographed image processing unit 31 of the photographing unit IM to photograph a range including the projected image, and projects the image from the photographed image by the projection unit PJ. A region of the projected image corresponding to the existing image pattern is extracted (step S102).

Next, the CPU 33 determines whether or not the automatic light adjustment function is set to ON at that time (step S102). When determining that the automatic light adjustment function is not set to ON and is set to OFF (No in step S102), the CPU 33 cancels subsequent processing and returns to the processing from step S101. return.

Further, when it is determined in step S102 that the automatic light adjustment function is set to ON (Yes in step S102), the CPU 33 again causes the photographed image processing unit 31 to photograph the projection plane, and obtains image data. The image data of the projection area is extracted and obtained by performing pattern recognition processing with the image data projected by the projection unit PJ at that time and extracting a substantially rectangular distribution area with a higher illuminance than the surroundings. (Step S104).

The CPU 33 calculates the gradation values (second brightness information) of the illuminance of all pixels constituting the image data of the extracted projection area from the photographed image 31, and then calculates the gradation values of the illuminance of all the pixels. The average gradation value of the illuminance obtained by integrating and dividing by the number of pixels is calculated.

In addition, the CPU 33 causes the projected image driving section 22 to calculate the average gradation value (first brightness information) of the brightness of all pixels of the image data being projected at that time, and the average gradation value is calculated as follows. It is determined whether or not the calculated average illuminance gradation value of the projection area is valid as a sample based on whether or not it is dispersed with the average gradation value of other luminances calculated up to the above by a predetermined value or more (step S105). .

The point of obtaining the average gradation value of the brightness of the projected image will be described. When the image data to be projected consists of all n pixels, the CPU 33 causes the projection image driving section 22 to calculate the luminance gradation value Yi at the i-th pixel (i=1 to n) by a general luminance matrix calculation. Yi = 0.2988 Ri + 0.5868 Gi + 0.1144 Bi
(where Yi: luminance value of the i-th pixel;
Ri, Gi, Bi: R, G, B values of the i-th pixel. )
Calculate as Under the control of the CPU 33, the projection image driving section 22 divides the total luminance of all n pixels by the number of pixels n to calculate the average luminance gradation value of the image being projected.

The average gradation value of the illuminance of the projection area calculated by the photographed image processing unit 31 is also obtained by calculating the gradation value Ii of the illuminance of each photographing pixel by the same formula as the luminance matrix calculation above, and then calculating the illuminance of all pixels. is divided by the number of pixels to calculate the average gradation value of the illuminance of the projection area.

FIG. 3 is a diagram illustrating the relationship between the average luminance gradation value of all pixels of the image input to the projection unit PJ and the average illuminance gradation value of the projection region calculated from the projection result.

In the figure, the average luminance gradation value of all pixels of the input image is shown in the range of 8 bits, from "0" to "255". 0”, the average gradation value of the illuminance of the projection plane when projecting an image in which the entire screen is black, is I0, and an image in which the entire screen is white, the average luminance gradation value is “255”. If is the average gradation value of the illuminance of the projection surface when projected. As indicated by the plotted positions of the black dots, the actual average gradation value of illuminance is obtained by obtaining as wide and dispersed samples as possible within the range of the minimum value I0 and the maximum value If of the average illuminance gradation value. Here, as shown by the linear expression "y=f(x)", the relationship between the luminance of the input image and the illuminance on the projection plane according to the projection environment can be estimated with higher accuracy.

The CPU 33 causes the projected image driving section 22 to calculate the average luminance gradation value of all pixels of the image being projected at that time, while the CPU 33 calculates the average gradation value of the illuminance of the projection area from the photographed image processing section 31 as described above. Calculate the value. The CPU 33 determines that the set of the average luminance gradation value of the input image and the average gradation value of the illuminance of the projection area in the captured image is a value that is appropriately different from the other already calculated sets of the same average gradation value. For example, it is calculated whether one calculated value is obtained for every "30" gradations within the range of the average gradation value "0" to "255" of the brightness of the input image. It is determined whether or not the set of average gradation values calculated is valid as a sample.

If it is determined that the calculated set of average gradation values is not valid as a sample (No in step S105), the set of calculated average gradation values is in the immediate vicinity of the black dot positions already plotted in FIG. Therefore, the CPU 33 invalidates the group of average gradation values, and returns to the process from step S104 to obtain the next sample.

If it is determined in step S105 that the set of calculated average gradation values is valid as a sample (Yes in step S105), the CPU 33 A set of average gradation values of illuminance is held and set as effective plot data in FIG. 3 (step S106).

After that, the CPU 33 determines whether or not the number of samples has reached a predetermined number, for example, "10" (step S107). When determining that the number of samples has not reached the specified number (No in step S107), the CPU 33 returns to the process from step S104 to obtain more samples.

If it is determined in step S107 that the number of samples has reached the specified number (Yes in step S107), the CPU 33 calculates the average luminance gradation value of the input image and the illuminance of the projection area in the captured image based on the sample result. is approximated by linear approximation or other functions to calculate an approximation formula (step S108).

Note that if the correlation between the average luminance gradation value of the input image and the average illuminance gradation value of the projection area in the captured image is not linear due to the influence of gamma correction, etc., the CPU 33 changes the correction information in advance. By acquiring the information in advance, it is possible to obtain an approximation formula by linear approximation by correcting the average luminance gradation value of the input image using the correction information.

Using the calculated approximation formula, the CPU 33 estimates the average illuminance gradation value I0 when the luminance gradation is "0" and the average illuminance gradation value If when the luminance gradation is "255" in FIG. By doing so, the current contrast value is estimated (step S109).

Then, it is determined whether or not the contrast value as the estimation result is out of the allowable range of the contrast value set in advance (step S110).

Specifically, by comparing the numerical range of the allowable range of contrast values stored in advance in the program memory 35 with the contrast value of the estimation result, the contrast value as the estimation result is set in advance. Determine whether the contrast value is out of the allowable range.

If it is determined that the contrast value as the estimation result is within the permissible range of the contrast value set in advance and is within the permissible range (No in step S110), the CPU 33 does not need to adjust the contrast. Then, the process returns to step S101 and waits for the next acquisition timing.

If it is determined in step S110 that the contrast value as the estimation result is out of the permissible range of the contrast value set in advance (No in step S110), then the CPU 33 It is determined whether or not the contrast value is below the allowable range (step S111).

If it is determined that the brightness of light emitted by the projection unit PJ at that time is low and the contrast value is below the allowable range (Yes in step S111), the CPU 33 determines the driving current value of each LED in the light source unit 24 of the projection unit PJ. is updated so that the emission luminance of these LEDs is increased by a certain value (step S112), the process returns to step S101, and waits for the next acquisition timing.

Further, in step S111, if it is determined that the light emission luminance of the projection unit PJ at that time is not low and the contrast value is not below the allowable range (No in step S111), the projection unit PJ at that time Since the light emission luminance is high and the contrast value exceeds the allowable range, the CPU 33 lowers the driving current value of each LED in the light source section 24 of the projection section PJ, thereby reducing the light emission luminance of these LEDs by a certain value. (step S113), the process returns to step S101 and waits for the next acquisition timing.

In steps S122 and S123 described above, the update setting is performed so as to adjust the emission luminance of each LED in the light source unit 24 by a constant value. In accordance with the contrast value of , the emission luminance of the light source unit 24 is basically adjusted only once so as to obtain the necessary contrast corresponding to the projection mode set at that time. Also good.

In the above-described embodiment, the correlation between the average luminance gradation value of the input image and the average illuminance gradation value of the projection area is calculated using linear approximation, and then, when the luminance gradation is "0", and the average illuminance gradation value If when the luminance gradation is "255". It is also possible to estimate the influence of ambient light from the estimated average gradation value I0.

With this configuration, when the average gradation value I0 is lower than the reference value, it is determined that the projection target is less affected by ambient light and has a sufficiently high contrast ratio, and the emission luminance of the light source unit 24 is reduced. The amount of electric power consumed by the light source unit 24 can be suppressed while processing is performed to ensure a sufficient contrast ratio. Further, when the average gradation value I0 is higher than the reference value, processing may be performed to increase the emission luminance of the light source unit 24, and control may be performed so that the contrast ratio approaches an ideal value.

With the above configuration, without performing the process of estimating the average gradation value If when the luminance gradation is "255" or the process of calculating the estimated contrast ratio using the average gradation value I0 and the average gradation value If, It is possible to simply optimize the contrast ratio and reduce the amount of power consumed by the light source unit 24 .

In the above embodiment, a plurality of sample points are acquired in order to estimate the correlation between the average luminance gradation value of the input image and the average illuminance gradation value of the projection area. can't

For example, the average luminance gradation value of the input image is calculated in advance, and only the average illuminance value of the projection area when the input image having the lowest average gradation value in the entire input image is projected is acquired. You can Based on the relationship between the obtained average illuminance value of the projection area and the predetermined reference value, the processing described in the above modified example is performed.

By adopting such a configuration, the number of samples to be acquired can be reduced, and simple processing can be performed without estimating the correlation between the average luminance gradation value of the input image and the average illuminance gradation value of the projection area. Ambient light effects can be estimated.

Also, in order to detect changes in the ambient light, the process of acquiring the average gradation value of the illuminance of the projection area at the timing when the average gradation value of the luminance of the input image takes a specific value is performed at predetermined intervals. You can do it.

By acquiring the average gradation value of the illuminance of the projection area at predetermined intervals, it is possible to detect the change in the ambient light from the change in the average gradation value of the illuminance. When a change is detected, the emission brightness of the light source unit 24 may be changed according to the amount of change in the average illuminance gradation value, and control may be performed so that the contrast ratio approaches an ideal value. Further, when a change is detected, the contrast correction processing described in this embodiment may be performed from the beginning.

Further, in the above-described embodiment, the contrast ratio is adjusted by adjusting the output of the light source unit 24, but the present invention is not limited to this. For example, the contrast ratio may be adjusted by increasing the average gradation value If by narrowing the projection angle of view by driving a zoom lens provided in the projection device. Further, when the contrast ratio is lower than the reference value, if the projection device is in a power-saving projection mode such as an eco mode at that time, the projection mode is changed to the normal projection mode and the average gradation value If is set to The contrast ratio may be adjusted by increasing it.

Further, in the above-described embodiment, it is assumed that the above-described operation is executed in each cycle of one frame of the projected image as the acquisition timing set in advance. good.

Further, in the above embodiment, the average luminance is obtained from the captured image, but the brightness information of the projection surface may be obtained using an illuminometer installed on the projection surface.

[effect]
As described in detail above, according to this embodiment, it is possible to maintain a high image quality projection operation while adapting to changes in ambient light.

In the above-described embodiment, the projector device 10 incorporates the imaging unit IM as well as the projection unit PJ, and acquires the projection area including the projected image by the imaging unit IM in the projector device 10. Projection operation with high image quality can be maintained more accurately without the necessity of externally connecting and installing an imaging device such as a digital camera.

Furthermore, in the above embodiment, the area of the projection surface is extracted from the imaged image and the average illuminance in the area is obtained, so the average illuminance in the projection area can be obtained with higher accuracy.

In addition, in the above embodiment, the average brightness of all pixels forming one frame of the image to be projected is calculated and acquired, so the average brightness in the projection region can be acquired with higher accuracy.

Although not described in the above embodiment, depending on the type of input image signal, information on the average brightness of the image in frame units may be added in advance as incidental information. When an image signal is input, the load required for arithmetic processing can be further reduced by effectively utilizing the added average luminance information.

Further, in the above embodiment, the projection conditions can be changed and set after estimating the contrast of the image being projected with higher accuracy based on the content of the acquired plural sets of average brightness and average illuminance.

In addition, regarding the content of the multiple sets of average brightness and average illuminance obtained above, the validity of the information is determined, and the necessary multiple sets of information are secured, so the contrast of the projected image is estimated. A high level of accuracy can be maintained when

Although the above embodiment has been described as applied to a DLP (registered trademark) type projector apparatus using LEDs as light source elements, the present invention does not limit light source elements, projection methods, and the like. For example, it can be similarly applied to a color liquid crystal type projection apparatus using a high-pressure mercury lamp.

Moreover, the present invention can be applied not only to projection devices, but also to various display devices having, for example, a flat panel display whose image display state changes depending on the surrounding environment or the like, or to control devices thereof. and

In addition, the present invention is not limited to the above-described embodiments, and can be variously modified in the implementation stage without departing from the scope of the invention. Moreover, each embodiment may be implemented in combination as much as possible, and in that case, the combined effect can be obtained. Furthermore, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiments, the problems described in the column of problems to be solved by the invention can be solved, and the effects described in the column of effects of the invention is obtained, the configuration from which this constituent element is deleted can be extracted as an invention.

The invention described in the original claims of the present application is appended below.
[Claim 1]
image signal acquisition means for acquiring an image signal;
projection control means for controlling a projection unit for projecting an image to project an image corresponding to the image signal acquired by the image signal acquisition means;
a first brightness acquisition means for acquiring first brightness information including average brightness information in an image plane according to the image signal acquired by the image signal acquisition means;
a second brightness acquisition means for acquiring second brightness information including average brightness information on the projection surface projected by the projection unit;
projection condition setting means for changing and setting projection conditions in the projection unit based on the first brightness information and the second brightness information;
A projection control device comprising:
[Claim 2]
2. A projection control apparatus according to claim 1, wherein said second brightness information is information obtained from a projection surface onto which an image corresponding to said first brightness information is projected.
[Claim 3]
further comprising imaging means for imaging the projection surface including the image projected by the projection unit;
The second brightness acquisition means acquires second brightness information including average brightness information from the image of the projection surface captured by the imaging means.
3. A projection control apparatus according to claim 1 or 2.
[Claim 4]
The second brightness acquisition means extracts a projection range from the image of the projection surface captured by the imaging means, and acquires second brightness information including average brightness information within the range. 4. A projection control apparatus according to claim 3.
[Claim 5]
2. The first brightness acquisition means acquires first brightness information including average brightness information of all pixels forming one frame of the image signal acquired by the image signal acquisition means. 5. A projection control apparatus according to any one of 4 to 4.
[Claim 6]
The image signal acquisition means acquires an image signal including average brightness information,
The first brightness acquisition means acquires first brightness information including average brightness information included in the image signal acquired by the image signal acquisition means.
4. A projection control apparatus according to claim 1.
[Claim 7]
The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and second brightness information including average brightness information acquired by the second brightness acquisition means. 7. The projection control apparatus according to any one of claims 1 to 6, wherein the projection conditions in said projection section are changed and set based on the contents of the plurality of sets of the second brightness information.
[Claim 8]
The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and second brightness information including average brightness information acquired by the second brightness acquisition means. 8. Projection control according to claim 7, wherein the validity of information constituting two pairs of brightness information is determined, and the projection conditions in said projection unit are changed and set based on a plurality of sets of information determined to be valid. Device.
[Claim 9]
A projection apparatus comprising: the projection control apparatus according to any one of claims 1 to 8; and the projection unit.
[Claim 10]
an image signal acquisition step of acquiring an image signal;
a projection control step of controlling a projection unit for projecting an image to project an image corresponding to the image signal obtained in the image signal obtaining step;
a first brightness acquisition step of acquiring first brightness information including average brightness information in an image plane according to the image signal acquired in the image signal acquisition step;
a second brightness acquisition step of acquiring second brightness information including average brightness information on the projection surface projected by the projection unit;
a projection condition setting step of changing and setting projection conditions in the projection unit based on the first brightness information and the second brightness information;
A projection control method comprising:
[Claim 11]
A device comprising an image signal acquisition unit for acquiring an image signal and a projection control unit for controlling the projection unit for projecting an image to project an image corresponding to the image signal acquired by the image signal acquisition unit is incorporated. A program executed by a computer, the computer comprising:
a first brightness acquisition means for acquiring first brightness information including average brightness information in an image plane according to the image signal acquired by the image signal acquisition unit;
a second brightness acquisition means for acquiring second brightness information including average brightness information on the projection surface projected by the projection unit;
projection condition setting means for changing and setting projection conditions in the projection unit based on the first brightness information and the second brightness information;
A program that works as

10... projector device,
21 ... input processing unit,
22 ... projection image driving unit,
23 ... micromirror element,
24 ... light source unit,
25...Mirror,
26 ... projection lens section,
27... lens motor (M),
28... photographing lens unit,
29... CMOS image sensor,
30... A/D converter,
31 ... photographed image processing unit,
32... lens motor (M),
33 CPU,
34 ... main memory,
35 ... program memory,
36 ... operation part,
37 ... audio processing unit,
38 ... speaker section,
IM... Shooting department,
PJ ... projection part,
SB: system bus

A projection control apparatus according to an aspect of the present invention is configured such that an image signal acquisition unit that acquires an image signal and a projection unit that projects an image project an image corresponding to the image signal acquired by the image signal acquisition unit. projection control means for controlling; first brightness acquisition means for acquiring first brightness information including average brightness information in the image plane according to the image signal acquired by the image signal acquisition means; an imaging means for capturing an image of a projection surface including a normal image projected by the projection unit and the projection surface corresponding to the first brightness information projected by the projection unit at each acquisition timing set in advance; a second brightness acquiring means for acquiring second brightness information including average brightness information from the image captured by the imaging means; and a contrast value before acquiring the second brightness information. and the first brightness information at the lowest luminance gradation obtained from the first brightness information, based on the memory storing the first brightness information and the second brightness information. A first average gradation value of illuminance obtained from second brightness information corresponding to the brightness information, and the first brightness at the maximum luminance gradation obtained from the first brightness information estimating a second average gradation value of the illuminance obtained from the second brightness information corresponding to the brightness information, and based on the first average gradation value and the second average gradation value , estimating an estimated contrast value, and adjusting projection conditions in the projection unit according to a comparison result between the estimated contrast value and the contrast value stored in the memory before acquiring the second brightness information. and projection condition setting means for changing and setting.

Next, the CPU 33 determines whether or not the automatic light adjustment function is set to ON at that time (step S10 3 ). If it is determined that the automatic light adjustment function is not set to ON and is set to OFF ( No in step S103), the CPU 33 cancels subsequent processing and repeats the processing from step S101. back to

Further , when it is determined in step S103 that the automatic light adjustment function is set to ON ( Yes in step S103), the CPU 33 causes the photographed image processing unit 31 to photograph the projection plane again, and obtains The image data of the projection area is extracted from the image data by performing pattern recognition processing with the image data projected by the projection unit PJ at that time, and extracting a substantially rectangular distribution area with a higher illuminance than the surrounding area. Acquire (step S104).

Claims (10)

image signal acquisition means for acquiring an image signal;
projection control means for controlling a projection unit for projecting an image to project an image corresponding to the image signal acquired by the image signal acquisition means;
a first brightness acquisition means for acquiring first brightness information including average brightness information in an image plane according to the image signal acquired by the image signal acquisition means;
imaging means for imaging a projection surface including a normal image projected by the projection unit at each acquisition timing set in advance;
a second step of acquiring second brightness information including average brightness information from an image of the projection surface corresponding to the first brightness information projected by the projection unit, captured by the imaging means; a means for obtaining the brightness of
projection condition setting means for changing and setting projection conditions in the projection unit based on the first brightness information and the second brightness information;
A projection control device comprising: The second brightness acquisition means extracts a projection range from the image of the projection surface captured by the imaging means, and acquires second brightness information including average brightness information within the range. 2. A projection control apparatus according to claim 1. 2. The first brightness acquisition means acquires first brightness information including average brightness information of all pixels forming one frame of the image signal acquired by the image signal acquisition means. 3. The projection control apparatus according to 2 above. The image signal acquisition means acquires an image signal including average brightness information,
The first brightness acquisition means acquires first brightness information including average brightness information included in the image signal acquired by the image signal acquisition means.
2. A projection control apparatus according to claim 1. The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and second brightness information including average brightness information acquired by the second brightness acquisition means. 5. The projection control apparatus according to any one of claims 1 to 4, wherein the projection conditions in said projection unit are changed and set based on the contents of the plurality of sets of the second brightness information. The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and second brightness information including average brightness information acquired by the second brightness acquisition means. 6. Projection control according to claim 5, wherein the validity of information constituting two pairs of brightness information is determined, and the projection conditions in said projection unit are changed and set based on a plurality of sets of information determined to be valid. Device. 7. The projection control apparatus according to any one of claims 1 to 6, wherein said preset acquisition timing is timing at which the number of image frames counted is a multiple of a frame rate of the image signal acquired by said image signal acquisition means. . A projection apparatus comprising: the projection control apparatus according to any one of claims 1 to 7; and the projection unit. an image signal acquisition step of acquiring an image signal;
a projection control step of controlling a projection unit for projecting an image to project an image corresponding to the image signal obtained in the image signal obtaining step;
a first brightness acquisition step of acquiring first brightness information including average brightness information in an image plane according to the image signal acquired in the image signal acquisition step;
an imaging step of imaging a projection surface including a normal image projected by the projection unit at each acquisition timing set in advance;
a second step of obtaining second brightness information including average brightness information from the image of the projection surface corresponding to the first brightness information projected by the projection unit, from the image captured in the imaging step; a step of acquiring the brightness of
a projection condition setting step of changing and setting projection conditions in the projection unit based on the first brightness information and the second brightness information;
A projection control method comprising: A device comprising an image signal acquisition unit for acquiring an image signal and a projection control unit for controlling the projection unit for projecting an image to project an image corresponding to the image signal acquired by the image signal acquisition unit is incorporated. A program executed by a computer, the computer comprising:
a first brightness acquisition means for acquiring first brightness information including average brightness information in an image plane according to the image signal acquired by the image signal acquisition unit;
imaging means for imaging a projection surface including a normal image projected by the projection unit at each acquisition timing set in advance;
a second step of acquiring second brightness information including average brightness information from an image of the projection surface corresponding to the first brightness information projected by the projection unit, captured by the imaging means; a means for obtaining the brightness of
projection condition setting means for changing and setting projection conditions in the projection unit based on the first brightness information and the second brightness information;
A program that works as

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