JPH01179139A - Video system color film analizer - Google Patents

Abstract

PURPOSE:To improve efficiency of testing negatives by performing photometry on the upstream side of an image pickup position. CONSTITUTION:As for a long film 13, notches are detected by a notch sensor 50. Since a distance between the sensor 50 and a photometric position is previously known, the feeding quantity of a film 13 is measured so a to position a frame where the notch is formed in a measuring position. The frame is lighted with a lamp 55 where light is converged. Respective color sensors 59, 60 and 61 and a scanner 58 in a hood for photometry perform, photometric measurement. The density values are obtained from the photometric data of the respective points through a computing unit 65 and arithmetically averaged with the density values of the respective points belonging to a previously specified area so as to obtain the density value of the area. Patterns are classified from the density distribution of each area and color correcting quantity in accordance with each pattern is obtained. Notch detection signals from a notch sensor 71 are transmitted to a CPU 52 and utilized to position the frame. Thus, incorporating image data is rapidly performed and testing negatives can be effectively performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video-type color film analyzer that images frames recorded on a color film and displays the images on an image display means.

[Prior Art] As a color film analyzer of this type, for example, as described in Japanese Patent Application Laid-Open No. 141530/1982, a plurality of frames recorded on a color film are analyzed using a television camera (hereinafter referred to as a TV camera). The image data of each frame obtained is written in the memory, and after this writing, the image data of each frame is read out, and gradation conversion and negative/positive conversion are performed using the LATD value (Large Area Average Transmitted Density Value). It is known that the image is then sent to a plurality of CRTs arranged in a row, and a color image simulating a printed photograph is displayed on each CRT. In this device, multiple CRTs display multiple frames of color images in a row, and the color and density of the color images displayed on the central CRT for verification can be manually corrected. Multiple C on one side of CRT
Color images of a plurality of unverified frames are displayed on the RT, and color images of a plurality of frames that have been corrected are displayed on a plurality of CRTs on the opposite side. Therefore, with respect to the color image displayed on the verification CRT, it is possible to determine whether the finish is appropriate by referring to a plurality of color images on both sides of the color image.

[Problem that the invention seeks to solve]

The conventional color film analyzer mentioned above prescans with a TV camera and uses the obtained image data to
Calculate the D filter value and the gradation conversion amount for each color, then ND
After adjusting the ND filter placed at the imaging position in accordance with the filter value, the image data is written into the memory by performing the main scanning operation. This ND filter is inserted into the optical path by a motor, etc., so it takes time to adjust it, but during that time you have to wait for data to be captured. Therefore, with conventional devices, it takes a long time to capture image data. The problem was that it took time.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a video color film analyzer that can quickly capture image data by separating photometry and imaging.

[Means for solving problems]

In order to achieve the above object, the present invention provides a photometry position upstream of the imaging position, measures the light of each frame using a measuring means placed at this photometry position to obtain a gray average density value, and calculates the gray average density value. It is determined whether the photometered frame is super overexposed or super underexposed based on the size of After making adjustments accordingly, the image is taken with a TV camera.

[Effect]

In the present invention, a photometry position is arranged upstream of the imaging position, and photometry is performed before taking an image of a frame, and an ND filter value is determined for a super overexposed or underexposed frame. The frame for which photometry has been completed is transported toward the imaging position, and during this film transport, the ND filter is moved in and out of the optical path according to the ND filter value. When the photometered frame is positioned at the imaging position, the TV camera starts imaging and captures image data.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

〔Example〕

A second image showing the appearance of the color film analyzer of the present invention.
In the figure, a supply reel 11 and a take-up reel 12 are detachably attached above a testing section main body 10.

A long film 13 is wound around the supply reel 11 by joining a large number of developed color negative films together into one roll film. In addition, the long film 13
A transparent tape is bonded to the tip of the leader as part of the leader. Long film 1 pulled out from supply reel 11
3 is sent to the photometry position via guide rollers 14, 15 and feed roller 16. A photometric hood 17 is attached above this photometric position, and a sensor placed in the hood 17 measures the light of the frame positioned at the photometric position. An arm 18 equipped with a notch sensor is placed between the feed roller 16 and the photometry position.
A notch formed along the center line of the frame to be printed is detected.

The long film 13 that has passed through the photometry position is sent to an imaging position. An imaging hood 21 housing a mirror is arranged above this imaging position, and the frame positioned at the imaging position is imaged by a TV camera via the mirror. In order to enable positioning at the imaging position and positioning at the photometry position to be performed independently, a recess 22 is formed, into which the long film 13 is inserted to form a loop. Further, an arm 23 is disposed between the recess 22 and the imaging hood 21, and a splice sensor for detecting a seam of color negative film and a notch sensor for detecting a notch are attached to the arm 23. It is being

The long film 13 that has passed through the imaging position is transferred to a feed roller 24. After passing through guide rollers 25, 26, it reaches the winding reel 12 and is wound around its outer periphery.

A magnetic floppy 29 storing image data of a reference frame is loaded into the floppy insertion slot 28 .

Further, correction data for each frame is recorded on the punch tape 30 in the form of a punch code at the end of the verification.

A color monitor 33 with a large screen size and a keyboard 34 are placed on the operation unit main body 32. This keyboard 34 includes color keys 35°, density keys 36. Collection key 37. Alphanumeric keys 38. Operation key 39. Frame designation key 402 Next page key 41. display 42
It is equipped with

The color keys 35 are a cyan key for correcting cyan and a magenta key for correcting magenta.

It consists of a yellow key for correcting yellow, and each color key is made up of a plurality of keys with different correction amounts in stages. The density key 36 is for correcting the density, and a plurality of keys with different correction amounts are arranged in a row. The alphanumeric keys 38 are used to set print conditions and input data.

The operation key 39 starts the verification and prints out the correction data.

Used to specify display mode etc.

The frame specification key 40 is used to manually specify the frame to be corrected, and there are 16 frames corresponding to each frame.
Consists of keys. The next page key 41 is used to switch the display on the color monitor 33 to the next page. The display 42 is for displaying input data and the like.

On the display surface 33a of the color monitor 33, color positive images of a plurality of frames arranged in a matrix are displayed in the order in which they were taken. In this embodiment, there are 16-frame display, 12-frame display, and 1-frame display, and the display mode can be designated by operating the operation key 39 of the keyboard 34 before taking an image with the TV camera. In the 16-frame display shown in FIG. 4, there are four columns (A-D) in the vertical direction, each column consisting of four frames.
A total of 16 frames of color positive images 45 are displayed. Here, the A column is the one that was imaged first, and the D column was the one that was imaged last. In the same column, the color image of the frame on the left side is captured first. In the 12-frame display, the color images of the four reference frames read from the magnetic floppy 29 are displayed in column D, and the TV
The color image 45 of 12 frames captured by the camera is A-
Displayed in column C. In the one-frame display, one frame of color image is enlarged to the size of four frames and displayed on the display surface 33a.

FIG. 1 schematically shows the color film analyzer of the present invention. A notch in the long film 13 is detected by a notch sensor 50 installed in the arm 18. The detection signal of this notch sensor 50 is I1
The data is sent to the CPU 52 via the 0 port 51. Since the distance between the notch sensor 50 and the photometric position is known in advance, 20 notches can be achieved by measuring the amount of transport of the long film 13 from the time of notch detection and transporting the long film 13 by this distance. The frame can be positioned at the measurement position. The amount of transport of the long film 13 can be measured, for example, by using a pulse motor 5 that transports the long film 13.
This can be done by counting three drive pulses by the CPU 52.

A negative mask 54 is placed at the measurement position, and the frame positioned at this position is illuminated with illumination light emitted from a lamp 55 and condensed by two condenser lenses 56. This illuminated frame is located at the photometric hood 17.
Scachy placed inside 58. Red sensor 59. Green sensor 60. It is measured by the sensor 61 for blue color.

The scanner 58 is composed of a lens 62 and an image area sensor 63, and photoelectrically converts each point of the image formed on the photosensitive section, and outputs it as a time-series signal. This time-series signal is converted into a digital signal by an A/D converter 64 and then sent to an arithmetic unit 65. This arithmetic unit 65 is composed of an 8-bit microcomputer, and logarithmically transforms the photometric data of each point, and writes the obtained density value into the memory. After this writing, read out the density value of each point belonging to the pre-specified area,
The density value of the area is determined by taking the arithmetic average of these values. In this way, density values are determined for multiple areas, for example, the center of the frame, and the remaining upper and lower half areas excluding this center, and the patterns are classified based on the density value distribution of each area. Find the corresponding color correction amount.

The red color sensor 59. The green sensor 60 and the blue sensor 61 are for measuring the LATD of the positioned frame, and a lens is placed in front of it. The signals output from these sensors 59 to 61 are converted into digital signals by an A/D converter 64, and then
The data is taken into the CPU 5' 2 via the I10 boat 51, and the correction amount for each color is calculated.

Two pairs of feed rollers 6 are provided on both sides of the negative mask 54.
8.69 are arranged, and these are connected to the pulse motor 53.
is driven by. The rotation of this pulse motor 53 is controlled by a motor controller 70 to transport the long film 13 and position the frames.

The frames that have passed through the photometry position are transported to the imaging position after passing through a buffer loop. In front of this imaging position is a notch sensor 71 attached to the arm 23. A splice sensor 72 is arranged. The notch detection signal output from the notch sensor 71 is sent to the CPU 52 via the I10 boat 51, and is used for positioning the frame as described above. Further, the splice sensor 72 generates a splice detection signal when it detects a splice in one color negative film, and sends it to the CPU 52 via the I10 port 51. When the cpU 52 receives a splice detection signal, it creates a splice frame 46 that displays the position of the joint on the color monitor 33, as shown in FIG. This splice frame 4
6 is created by shifting the writing position of image data by one frame on the image memory.

A negative mask 73 is arranged at the imaging position,
The frames positioned on this negative mask 73 are illuminated with illumination light from a lamp 75 that is diffused by a mixing box 74. This mixing box 74 and lamp 75
Two ND lafurters 76 are disposed between them, and are moved by a pulse motor 77 in opposite directions in a plane perpendicular to the optical path. This ND lafurter 76 is normally inserted at a standard position, is withdrawn from the optical path for extremely overexposed frames, and is further inserted into the optical path for extremely underexposed frames.

Two sets of feed rollers 78 are provided on both sides of the negative mask 73.
．． 79 is arranged and is driven by a pulse motor 80. The rotation of this pulse motor 80 is controlled by a motor controller 0, and the notched frames are sequentially positioned at the I-most image position. The light transmitted through the frame positioned at this imaging position is transmitted to a mirror 82 disposed inside the imaging hood 21.
TV camera 8 placed inside the testing unit main body 10
The image is taken at 3. This TV camera 83 has a red signal R1.
A green signal G, a blue signal B, and a synchronization signal 5sync are generated. These red signal R5 green signal G.

After the blue signal B is subjected to image processing in the image processing section 84,
The image is sent to the color monitor 33. light controller 85
creates an address signal etc. based on the synchronization signal 5ync and controls writing in the image processing section 84. Further, the read controller 86 is controlled by the CPU 52 and creates address signals for reading by the image processing section 84, synchronization signals for sending to the color monitor 33, and the like.

The floppy driver 87 reads the image data of the reference image written on the magnetic floppy 29 and writes it to the image processing section 84 . The puncher 88 is activated at the end of the negative inspection and records correction data (color correction amount, density correction amount) on the punch tape 30. Fixed data such as printing conditions and programs for controlling the operations of each part are written in the ROM 89. The work RAM 90 is used for backing up image data and the like.

FIG. 3 shows an embodiment of the image processing section, and since the red signal processing system, green signal processing system, and blue signal processing system all have the same configuration, only the red signal processing system is shown. The red signal output from the TV camera 83 is amplified by an amplifier 95 and then sent to a clamp circuit 96, where the level of the reference signal is set. The red signal output from the clamp circuit 96 is converted into a digital signal by an A/D converter 97 and then sent to a logarithmic converter 98. This logarithmic converter 98 is configured with a look-up table memory, and logarithmically transforms the input signal to convert it into image data proportional to the density value. The CPU 52 is the TV camera 8
Before the start of imaging No. 3, the table data stored in the ROM 89 is written into the lookup table memory.

The saturation correction circuit 99 is for correcting the difference between the spectral sensitivity of the color paper used in the color printer and the spectral sensitivity of the imaging section of the TV camera 83, and is used to weight the image data of each color. It consists of three lookup table memories 99a and an adder 99b that adds the outputs of these three lookup table memories 99a and outputs the addition result as red image data. Before starting the negative test, the CPU 52 reads the ROM
The three sets of coefficients stored in the memory 89 are read out and changed in steps to create three types of table data for correcting red color saturation and written into the three lookup table memories 99a. .

The saturation-corrected red image data is processed by a demultiplexer.
Image memory Iota designated by 100.

101b. These image memories 101a and 101b have a memory capacity for one screen (one page) displayed on the color monitor 33, and writing and reading are performed alternately. Therefore, for example, while the image memory Iota is being read out one page of image data under the control of the read controller 86, T
New image data captured by the V camera 83 is transferred to the other image memory 101b controlled by the light controller 85.
will be written to. Next, when reading from the image memory 101b is started, writing to the other image memory 101a is started. By using the image memory for two pages in this way, it is possible to prevent negative verification from being interrupted while image data is being taken in.

The image memories 101a and 101b each consist of four memory blocks, and each memory block stores image data for one column (four frames). Therefore, by changing the reading order of the memory blocks, the display position of the color monitor 33 can be changed for each column. For example, "12
Because manual correction is required in case of “Frame display”,
When a frame is designated with the frame designation key 40, the row containing this frame is shifted to the 0th row position and displayed next to the reference image, thereby facilitating comparison with the reference image.

For the image memories 101a and 101b, the CPU 5
An interface 102 is provided in order to read and write image data using the computer 2. Image memory 1
The image data read from either one of 01a and 101b is sent to a gradation conversion circuit 104 via a multiplexer 103, where negative/positive conversion and gradation conversion are performed. This gradation conversion circuit 104 is composed of 16 look-up table memories to correspond to a maximum of 16 frames displayed as one screen, and the gradation conversion circuit 104 is configured with 16 look-up table memories to correspond to a maximum of 16 frames displayed as one screen, and the frame is converted according to the photometry result of the frame and the amount of manual correction. The table data created each time is written by the CPU 52. These table data are created by shifting the reference table data of each color stored in the ROM 89 according to the color correction amount.

The image data subjected to gradation conversion for each frame is converted into a serial signal by a parallel-to-serial converter 105, and then sent to a D/A converter 106.

The red signal converted into an analog signal by the D/A converter 106 is sent to the color monitor 33.

Next, the operation of the above embodiment will be explained with reference to FIG. After turning on the power, operate the alphanumeric keys 38 on the keyboard 34 in order to match the color film analyzer's verification conditions with the color printer's exposure conditions.
Specify the same print channel as the color printer you are using. Next, the display mode, for example, "16-frame display" is designated by operating alphanumeric keys.

After installing the supply reel 11, pull out a part of the transparent leader bonded to the leading edge of the developed color negative film, hang it on the guide rollers 14 and 15, and then transfer it to the feed roller 16.
Insert it into the This feed roller 16 is driven by a pulse motor 53
Since the sensor is driven by the sensor, a part of the reader is moved toward the photometry position. This transferred leading end is passed to a pair of feed rollers 68, 69 placed on both sides of the negative mask 54, and further passed to a pair of feed rollers 78, 79 placed on both sides of the imaging position. A part of the leader that has passed the imaging position is pulled out from the feed roller 24, so it is pulled out from the guide roller 25.2.
6, and then wrap it around the outer periphery of the take-up reel 12.

When a portion of the leader is pulled out from the supply reel 11, the developed color negative film is subsequently pulled out and transported toward the take-up reel 12. If the notch sensor 50 detects a notch during this transfer, the pulse motor 5
3 drive pulses are counted, and the film feed amount from the notch sensor 50 is measured. Then, when the first notch is moved a distance between the notch sensor 50 and the center of the negative mask 54, the pulse motor 53 stops rotating. In this state, the frame with the first notch is positioned at the photometry position.

The frame positioned at the photometry position is illuminated by a lamp 55, and in this state, each point of the negative image is photometered by a scanner 58, and LATD sensors 59 to 61
Accordingly, the LATD values of red, green, and blue are photometered.

When photometry is completed, the pulse motor 53 rotates again to transport the long film 13, position the second notched frame at the photometry position, and photometer this frame. Thereafter, the third and subsequent frames are also sequentially positioned at the photometry position and photometered.

When the first frame for which photometry has been completed is transported toward the imaging position, the notch of the first frame is detected by the notch sensor 71. When this notch is detected, the drive pulses of the pulse motor 80 are counted and the film feed amount is measured.

When the long film is fed by a certain amount, the pulse motor 80 stops rotating and the first frame is positioned at the imaging position. While this first frame is positioned at the imaging position, it is determined from the photometry result whether it is super overexposed or super underexposed, and for super overexposed frames, the CPU 52 drives the pulse motor 77. Then, the ND Lafurta 76 is evacuated from the optical path, and the lamp 75 is removed.
The frame is illuminated with strong illumination light. Conversely, for underexposed frames, the ND Lafurter 76 is inserted into the optical path to reduce the illumination light.

Before the first frame is positioned at the imaging position,
Since the lafurter 76 has been adjusted, imaging by the TV camera 83 starts immediately after positioning is completed. The time-series red, green, and blue signals output from the TV camera 83 are sent to the image processing unit 83, where they are subjected to saturation correction and storage.

Gradation conversion is performed. That is, as shown in Figure 3,
The red signal is amplified and clamped, and then converted into red image data by an A/D converter 97.

This red image data is converted into red image data proportional to the density value by a logarithmic converter 98, and then converted into red image data proportional to the density value by a saturation correction circuit 98.
Sent to 9th. The saturation correction circuit 99 multiplies the three-color image data by coefficients and adds them, and outputs the added value as red image data. The red image data is sent to an image memory designated by the demultiplexer 100, for example 101a, and written to the first memory area of the 16 memory areas designated by the light controller 85. Similarly, the second and subsequent frames are sequentially positioned at the imaging position, captured by the TV camera 83, and written into the image memory 101a.

Since the long film 13 is made by joining a large number of color negative films together with a transparent or white splice tape, the passage of the splice tape can be detected by measuring the density with the splice sensor 72. When this splice tape is detected, the frame located next to the splice tape is stored in the image memory 101.
One memory area is skipped on a and the data is written to the next memory area. This skipped memory area becomes a splice frame 46 as shown in FIG. 4 because no image data is written therein. This splice frame 4
By displaying 6, it is possible to know the beginning of one color negative film. Generally, it is desirable that the frames included in one color negative film have the same finish, but displaying the splice frames 46 makes this possible and is extremely convenient in practice.

When 16 frames including splice frames are captured, 1
Image reading for one page is completed. In this case, the demultiplexer 100 is switched to the image memory 101b side and reading from the image memory 101a is started. When the image memory 101b enters the write mode, image data of a new frame read by the TV camera 83 is sent to the image memory 101b, and the image data is written as described above. In this way, the newly read 16 frame images are stored in the image memory 101a.

When the image memory 101a enters the read mode, the read controller 86 reads image data. This image data is sent to a gradation conversion circuit 104 via a multiplexer 103, where negative/positive conversion and gradation conversion are performed. Since this gradation conversion circuit 104 has a look-up table memory prepared for each frame, the one corresponding to the frame being read out is selected, and the image data is converted using the table data stored therein.

Here, table data created by shifting the reference table data according to the photometry results measured at the photometry positions is written in each lookup table memory.

The gradation-converted image data is converted into a serial signal by a parallel-to-serial converter 105, then converted into an analog signal by a D/A converter 106, and the obtained red signal is sent to the color monitor 33. Similarly, the green signal and the blue signal are read out, and one page containing 16 frames of color images 45 is displayed on the color monitor 33, as shown in FIG. Note that, in reality, the color image 45 of each frame is slightly separated so as not to stick to the color images on the top, bottom, left, and right, and the space between them is displayed as a white frame.

Since color images 45 of 16 frames simulating printed photographs are displayed on the color monitor 33, it is determined whether these densities and colors are appropriate. Then, for a color image that is recognized as having a poor finish, the frame is designated by operating the frame designation key 40 on the keyboard 34. When this frame designation is performed, the designated A designation mark 47 is displayed in a part of the color image of the frame. In this embodiment, the designation mark 47
By performing negative/positive conversion on this part, it is displayed so that it can be distinguished from the surrounding image parts. In order to perform this negative/positive conversion, the image data of the specified frame is stored in the image memory 1.
01 and written to the work RAM 90 via the interface 102. The CPU 52 reads the image data of a specific part of the frame from the work RAM 90, converts it into a positive image, sends it to the image memory 101a via the interface 102, and writes it into a part of the memory area of the read frame. The partial image data is subjected to negative/positive conversion by the gradation conversion circuit 104, so that it is displayed as a negative image as a result.

After specifying the frame, the user operates the color key 35 or the density key 36 to input the correction amount. When this correction amount is input, the table data of the look-up table memory that performs the gradation conversion of the specified frame is updated. Since the image data is converted using this new table data, the color image of the specified frame is displayed with the density or color corrected. If this correction is insufficient, the color key 35 or density key 36 may be operated again. If correction is required for another frame as well, the frame designation key 40 corresponding to this frame is operated. When this frame designation key 40 is operated, the frame stored in the work RAM 90 is written into the image memory 101a via the interface 102. After this writing, the image data of the newly designated frame is read out from the image memory 101a and the work RA is read out.
It is written on M90, and as mentioned above, some of it is negative.
Positive conversion is performed. As a result, the frame designation mark 47 displayed on the color image of the corrected frame is erased, and the frame designation mark 47 is displayed on the color image of the newly designated frame. The density and color of this newly designated frame can also be modified as described above.

If it is recognized that all the frames are finished well, the next page key 41 is operated. This next page key 4
When 1 is operated, 1 stored in the image memory 101b is
Six frames of image data are read out and displayed on the color monitor 33 as described above. Negative verification can be performed on one page of frames displayed on the color monitor 33 as described above. During this negative verification, the transport of the long film 13 is started, and the 16 frames recorded thereon are sequentially imaged by the TV left camera 3, and the obtained image data is written into the image memory 101a.

When the negative verification has been completed for all the frames recorded on the long film 13, by operating the operation key 39,
Correction data for each frame stored in the work RAM 90 is recorded in the punch chip 130. This correction data is
This is the sum of the amount of correction automatically calculated by the scanner 58 and the amount of manual correction manually entered. When printing a photo, if the punch tape 30 is set in the printer, correction data is read from the punch tape 30.

In addition, since the printer is equipped with red, green, and blue LATD sensors, these
ATD value is measured. The exposure amount for each color is measured from these LATD values, and by adding the correction data read from the punch tape 30, the exposure amount during photographic printing is adjusted for each color.

When displaying 12 frames, the keyboard 34 is operated to specify this display mode. After specifying the mode, the magnetic floppy 29 is set and the four reference images written therein are read out and written into the work RAM 90. After this writing, the image data of the reference image is read from the work RAM 90 and written to the memory areas of the image memories 101a and 101b corresponding to the fourth column on the color monitor 33, respectively. In this 12-frame display, 12 frames are read at a time, and the first column A to third column C
will be displayed. At the time of negative inspection, the finish can be checked by referring to the four reference images displayed in the fourth column.

Even in the case of single-frame display, the user first operates the keyboard 34 to specify the display mode. In this one-frame display, imaging and display are performed one frame at a time, and a one-frame color image written to the image memory, for example 101a, in read mode is displayed in a large size in an area corresponding to four frames in the center of the screen. is displayed.

This size expansion is achieved by electrically increasing the magnification through interpolation processing, as well as by shortening the sampling period of the A/D converter 97.
Image data for each frame may be created. For example, 1 frame worth of image data may be created.
In the case of 6-frame display, use the frame designation key 40 to correct the color.
When specifying a frame with , it is convenient to enlarge and display this frame.

Next, the gradation conversion will be explained with reference to FIG. 6.The frame positioned at the photometry position is scanned by the scanner 63. L.A.
The light is measured by sensors 59 to 61 for TD photometry. These sensors 59-61 have red LATI) values, green LATI) values,
The TD value and blue LATD value are each measured. A gray average density value is calculated by arithmetic averaging these LATD values. The obtained gray average density value is compared with the gray average density of super-exposed overcoat "7", and if it exceeds this value, it is determined that the measured frame is super-overexposed.

Further, by comparing it with the gray average density of the super-underexposed coma, if it is less than this value, it is determined that the measured frame is a super-underexposed coma. If the photometered frame is determined to be a super overexposed frame, the predetermined N
A D Lafurta value is selected, and if it is determined that the frame is a super-exposed undercoma, a fixed ND Lafurta value is selected. For these super overexposed or underexposed comas, the amount of color correction for cyan, magenta, and yellow is calculated using the LATD value in consideration of the ND Lafurta value. Furthermore, for cases other than super overexposure or undercoma, the color correction amount is calculated from the LATD value.

Since the scanner 58 measures the density of each point of the frame, it extracts the density of the measurement points included in a pre-designated area and calculates the density value of the area from the arithmetic mean. In this way, the density values of a plurality of areas are determined, and patterns such as front-lit scenes and back-lit scenes are classified. A predetermined density correction amount is calculated for each pattern.

The color correction amount measured using the LATD sensors 59 to 61 and the density correction amount measured using the scanner 58 are added for each color and then written into the work RAM 90. Here, since the density correction is to correct the same amount for cyan, magenta, and yellow, the density correction amount is converted into a color correction amount and then added. From the obtained correction amount for each color, the gradation conversion amount, which is the shift amount of the reference table data, is calculated for each color. These calculations are performed while the conveyance of the long film 13 is started after photometry is completed and the next frame is positioned at the photometry position.

Since the ROM 89 stores reference table data for each color (different depending on the color), the reference table data is read out after being shifted according to the amount of gradation conversion. For example, for red table data, the gradation It is sent to the conversion circuit 104 and written in the area corresponding to the frame to be gradated.

When manual correction is performed by operating the keyboard 34, the manually input color correction amount and density correction amount (converted to color correction amount) are added to the color correction amount read out from the work RAM 90, and this addition is performed. The amount of gradation conversion is determined from the value, the reference table data is shifted again, and this shifted table data is written into the gradation conversion circuit 104.

Since the printer has a built-in sensor for LATD, the density correction amount calculated by the scanner is stored in the work RAM.
90 and when manual correction is performed, this correction amount is added to the density correction amount of the scanner and then written to the work RAM 90. At the end of the verification, the correction amount for each frame stored in the wire RAM 90 is read out and recorded on the punch tape 30.

Although the above embodiment uses a color CRT as a color monitor, a liquid crystal display panel or the like may also be used.

〔Effect of the invention〕

As explained in detail above, according to the present invention, a photometry position is provided upstream of the imaging position, and frames are photometered at this photometry position, and super-overexposed frames or super-underexposed frames are detected at this frame. Because the ND Lafurta is inserted and removed before the ND Lafurta is positioned at the imaging position, the image quality is much lower than with conventional equipment, which measures light at the imaging position, then takes the ND Lafurta in and out, and then takes an image. Data can be taken in quickly and negative tests can be performed efficiently.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a color film analyzer of the present invention. FIG. 2 is an external view of the color film analyzer of the present invention. FIG. 3 is a block diagram showing an example of an image processing section. FIG. 4 is an explanatory diagram showing an example of display on a color monitor. FIG. 5 is a flowchart showing the procedure of negative verification. FIG. 6 is a flow cheat showing the procedure of gradation conversion. 13... Long film 17... Photometric hood 21... Imaging hood 29... Magnetic floppy disk 30... Bunch tape 33... Color monitor 34... Keyboard 35...Color key 36...Density key 40...Frame designation key 41...Next page key 5 days...Scanner 59...Red sensor 60... - Green sensor 61... Blue sensor.

Claims (2)

[Claims] (1) In a video color film analyzer that images a frame of a color film positioned at an imaging position with a television camera and displays a color image simulating the finished printed image of this frame on an image display means, from the imaging position. A photometry position is provided on the upstream side of the frame, and the frame positioned at this photometry position is photometered by a photometer to determine the gray average density value of the frame. Based on this gray average density value, it is determined whether the frame is super overexposed or super underexposed. However, the ND filter value is determined for these improperly exposed frames, the ND filter placed at the imaging position is adjusted according to the ND filter value, and then the photometered frame is imaged with a TV camera. A video color film analyzer. (2) The photometry section includes a red sensor that measures red light, a green sensor that measures green light, a blue sensor that measures blue light, and a calculation section that calculates the average value of the photometric values of these sensors. A video color film analyzer according to claim 1, characterized in that the video color film analyzer comprises: