JP2002271825A - Color matching method, color matching system, and television camera used for them - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color matching method that can easily match colors of a plurality of television cameras without the need for a special adjustment device. SOLUTION: A memory card 100 stores reference data that are obtained by using other television camera to photograph a prescribed object. A microcomputer 245 reads the reference data, and reads image data obtained by photographing a prescribed object from a memory 244 and calculates the error between the image data and the reference color data. Then the memory 244 stores correction data required to eliminate the error and to nearly match the image data with the reference color data. In the case of photographing the object, the image data obtained by photographing the object are corrected with the error signal on the basis of the stored correction data and the corrected image data are outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where the same subject is photographed by a plurality of television cameras.
The present invention relates to a color matching method and a color matching system for matching colors of images output from respective television cameras almost identically, and a television camera used for the same.

[0002]

2. Description of the Related Art In a movie production or the like, the same subject is photographed by a plurality of television cameras at a studio or location, and image data output from each television camera is edited. I have. Each television camera used for such photographing includes an optical unit such as a lens, a dichroic prism, and a CCD for each color of RGB, an analog signal processing unit, an A / D converter, and a digital signal processing unit. The optical unit and the analog signal processing unit have individual errors that differ for each television camera.

When the same subject is photographed by a plurality of television cameras while leaving such individual errors, the colors of the images output from the television cameras (for example, the skin color of the subject) are significantly different. This requires complicated color matching work at the time of editing.

For this reason, conventionally, individual errors of each television camera are adjusted using an adjusting device such as a monitor, a waveform monitor, and a vector scope prepared in a studio or the like, and then a plurality of cameras are adjusted in a studio or a location. The same subject was photographed with a television camera.

[0005]

However, in the conventional color matching method, the color matching system, and the television camera used for them, complicated adjustment work using an adjusting device is indispensable. In addition, since the expensive and large-scale of the adjustment device for the field it is difficult to separately prepared, it becomes necessary tasks, such as bringing the studio of adjustment television camera yelling match the colors in the equipment on location. Therefore, color matching of a plurality of television cameras cannot be easily performed.

[0006] The present invention has been made in view of the above problems, the color matching method capable of easily performing color matching of a plurality of television cameras without special adjustment equipment, color matching system and It is an object to provide a television camera used for these.

[0007]

In order to solve the above-mentioned problems, a color matching method according to the present invention provides an output from each television camera when the same subject is photographed by a plurality of television cameras. A color matching method for matching the colors of the images to be almost the same, wherein one reference television camera arbitrarily selected from a plurality of
A reference data acquisition step of acquiring reference data obtained by photographing a predetermined object, in the remainder of the television camera, and the reference data taken from the reference television camera, of the predetermined in the remainder of the television camera an error calculation step of calculating the error between the image data obtained by photographing an object, in the remainder of the television camera, thereby eliminating the error the image data of said reference color taken by the television camera comprising a correction data holding step of holding by calculating the correction data required to substantially match the data, the, in the remainder of the television camera, the image data obtained by photographing an object correction data And outputs the corrected image data. And it outputs the image data obtained by without correction, and in particular characterized.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first aspect of the present invention is to provide a color matching method in which when the same subject is photographed by a plurality of television cameras, the colors of the images output from the respective television cameras are substantially the same. A reference data acquisition step of acquiring reference data obtained by photographing a predetermined subject in one reference television camera arbitrarily selected from a plurality of television cameras; An error calculating step of calculating an error between the reference data captured from the reference television camera and image data obtained by photographing the predetermined subject with the remaining television camera; in John camera substantially coincides with the image data by eliminating the error taken with the television camera on the reference color data And a correction data holding step of holding the correction data is calculated necessary to, in the remainder of the television camera, the correction based on the image data obtained by photographing an object on the correction data do it,
Outputting the corrected image data, in the reference television camera outputs without correcting the image data obtained by photographing an object, and particularly characterized.

According to a second aspect of the present invention, there is provided a color matching system for matching the colors of images obtained by each television camera almost identically when the same subject is photographed by a plurality of television cameras. The reference television camera arbitrarily selected from the plurality of the reference television cameras includes a reference data acquisition unit that acquires reference data obtained by photographing a predetermined subject, and a reference data that outputs the reference data to the outside. Output means, and the remaining television camera
Reference data receiving means for capturing the reference data from a reference television camera, and the captured reference data,
Error calculating means for calculating an error between image data obtained by photographing the predetermined subject with the remaining television camera, and the image photographed by the residual television camera by eliminating the error Correction data holding means for calculating and holding correction data necessary to make the data substantially coincide with the reference color data, and for a remaining television camera, an image obtained by photographing a subject. data, the correction data is corrected on the basis of the outputs the corrected image data, in the reference television camera outputs without correcting the image data obtained by photographing an object, in particular Has features.

According to a third aspect of the present invention, there is provided a television camera capable of making the same color as an image obtained by another television camera substantially the same when a plurality of the same subject is photographed. Reference data receiving means for capturing reference data obtained by photographing a predetermined subject by another television camera, and the reference color data and image data obtained by photographing a predetermined subject by the television camera. Error calculating means for calculating an error between the correction and the correction for calculating and holding correction data necessary to eliminate the error and make the image data taken by the television camera substantially coincide with the reference color data. Data holding means for correcting image data obtained by photographing a subject based on the correction data, and outputting corrected image data. It has a feature.

With the configuration of the present invention described above, it is possible to match the color obtained when shooting with the remaining television camera to the color obtained when shooting with the reference television camera. In addition, such color matching (correction) can be performed by the television camera alone without using a special correction device.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the overall configuration of a color matching system.

As shown in FIG. 1, the color matching system 1
It comprises a plurality of television cameras 200a to 200n having a memory card receiving means 246 for inputting and outputting data to and from the memory card 100.

Each of the television cameras 200a to 200n
To match the colors of the image output from
In the color matching system 1, first, a predetermined subject S is photographed by one reference television camera (for example, the television camera 200a) arbitrarily selected from the television cameras 200a to 200n. reference data by obtaining a, the reference data to be written to the memory card 100 via the memory card receiving unit 246. Then, the memory card 100 on which the reference data is written is transferred to the remaining television camera 200b.
~ 200n, and the remaining TV camera 2
The reference data is input to 00b to 200n. Next, in the remaining television cameras 200b to 200n,
Calculates an error between image data obtained by photographing a predetermined subject S and the reference color data, eliminates the error, and holds correction data necessary to make the image data substantially match the reference color data. Let it. In the remaining television cameras 200b to 200n, the image data obtained by photographing the subject S is corrected with the correction data, and the corrected image data is output.
In 00a, image data obtained by photographing the subject S is output without correction.

Next, each of the television cameras 200a-
The configuration of 200n will be described with reference to the block diagram shown in FIG. Since the television cameras 200a to 200n have the same configuration, the television cameras 200a to 200n
One of n is represented by a television camera 200, and the description will be made with the television camera 200.

As shown in FIG.
00 denotes an optical unit 210, an analog signal processing unit 220, A
D converter 230, the digital signal processing unit 240, a color adjustment switch 250, a memory card receiving unit 246
When provided with a memory card 100 is configured to be inserted and removed.

The optical section 210 includes a lens 21 having a stop.
1. A dichroic prism 212 that separates an image into RGB colors and CCDs 213, 214, and 215 that convert RGB light into electric signals.

The analog signal processing section 220 is provided for each CCD 2
The preamplifier 221 amplifies the electric signals of the respective colors output from 13, 214, and 215, and the preprocess 222 performs processes such as gain-up and white balance on the amplified electric signals. The analog electric signal of each color output from the preprocess 222 is output to the AD converter 23.
It is converted to a digital electric signal by 0.

The digital signal processing unit 240 includes a matrix 241 for processing digital signals of each color output from the AD converter 230 based on an error signal, a gamma knee 242 for performing processing such as gamma correction, and a digital signal for each color of RGB. YPB to convert video into component video signal
- PR matrix 243 consists of memory 244, the microcomputer 245 such as color adjustment for the program incorporating the stored ROM that stores a 1-frame of the RGB colors of the digital data output from the gamma-knee 242.

[0021] Note that the television camera 200a~20
0n is provided with a mode setting switch for setting one of a reference mode operating as a reference television camera and a residual mode operating as a remaining television camera, and operating the mode setting switch. Then, the television camera can be divided into one reference television camera arbitrarily selected from the television cameras 200a to 200n (for example, the television camera 200a) and the remaining television cameras 200b to 200n. .

The microcomputer 24 of the television camera 200a whose adjustment switch 250 is operated in the reference mode.
5 indicates that the error signal is "0" according to the ROM program.
By treating the matrix 241 in an open loop by the, at this time the RGB colors of the digital data obtained by photographing the subject S is read from the memory 244 written to the memory card 100, and terminates the writing process. After the writing process is completed, the subject S
In the microcomputer 245 of the reference television camera 200a, the error signal is set to “0” as it is, so that the matrix 241 is processed in an open loop and the image data obtained by shooting the subject S is obtained. and so as to output without correction.

The memory card 100 on which the reference data is written is used for storing the remaining television cameras 200b to 200b.
n memory card accepting means 246, and reference data is input to the remaining television cameras 200b to 200n.

Next, when the adjustment switch 250 is operated in the residual mode, the television camera 200
The processing operations executed by the microcomputers 245 of b to 200n are
This will be described based on the flowchart shown in FIG.

First, the microcomputer 245 periodically determines whether or not the color matching adjustment switch 250 has been operated (step S1). If not operated, this routine is skipped (No in step S1), and if operated, the process proceeds to step S2. In step 2, the correction data held in the memory 244 is reset to “0”. Then, the reference data is read from the memory card 100 (step S3), and the image data obtained by setting the state where there is no error signal when the correction data is “0” is read from the memory 244 (step S4). In this case, since the matrix 241 performs processing in an open loop, image data obtained by photographing the subject S is obtained without correction.

Next, to calculate the error between the reference data and the image data (step S5). In this case, a frame F is set in the skin color region of the subject S projected on the monitor screen shown in FIG. 4, and the average value of the data of the pixels in the frame F is calculated for each of the RGB colors. A value is calculated to obtain a color error. Further, the color matching of each of the television cameras 200a to 200n is performed under the same shooting conditions such as illumination, the same aperture of the lens, and the shooting magnification. When the calculation of the error data value is completed, it is determined whether or not the error data = "0" (step S6).

When the error data is "0" (step S6)
Yes), the correction data "0" of step S2 is held as it is (step S7), and this routine ends.

If the error data is "0" while the correction value is "0", the reference television camera 20
0a and the remaining television cameras 200b to 200n are not individual differences, and thus the colors match very well without correction, and as a result of the individual error, the error data is not corrected. it is not 0 ", which is a normal. Therefore, in this case (Yes in step S6)
The microcomputer 245 updates the correction data other than "0" (step S8), and outputs an error signal corresponding to the correction data, reads out the image data obtained by the error signal output state from the memory 244 (Step S
9) Return to step S5. Steps S5 to S9 are repeatedly executed until the error data becomes “0”. And
When the error data becomes “0” (Ye in step S6)
s), the correction data updated in step S8 is held (step S9), and this routine ends.

When the subject S is photographed after the correction data holding processing is completed, the remaining television camera 20
In the microcomputer 245 of 0b~200n causes the feedback error signal based on such correction data in the matrix 241. As a result, regardless of the individual difference between the optical unit 210 and the analog signal processing unit 220, processing for absorbing the individual difference is performed in the matrix 241. Therefore, each television camera 200a
Even if the image data obtained by photographing the subject S at ~ 200n is output, the overall characteristics match with high accuracy and accurate color matching can be performed.

Therefore, a special adjusting device is not required, the labor required for the adjustment by the adjusting device can be omitted, and the color can be easily adjusted by a simple operation even at a location.

Although the color matching method and the color matching system according to the present invention and the television camera used therein have been described based on the embodiments, the contents of the present invention are not limited to the above embodiments. Of course, the following modified examples are conceivable.

In the above embodiment, the reference color is set to a single skin color, but the reference color is set to RGB using a color chart or the like.
It may be set to a plurality of three colors.

In the above embodiment, the error of the color data including the hue and the luminance is calculated and the colors are adjusted. However, only the error of the hue may be calculated and only the hue may be adjusted.

In the above embodiment, the error data is detected by the average value detection. However, the peak value detection for detecting the value of the pixel having the highest output may be used.

In the above embodiment, the frame F is set on the monitor screen and the error within this frame F is calculated. However, the error over the entire monitor screen may be calculated.

In the above embodiment, the reference data is passed by the memory card 100. However, the reference television camera and the correction television camera are connected by a cable or the like, and the reference data is transmitted via the cable. May be transmitted, or the reference data may be transmitted wirelessly.

Further, it is preferable to carry out color matching work in a state where shooting conditions such as illumination and aperture are matched. Thus, color matching matching state is obtained accurately.

[0038]

According to the color matching method according to the present invention as described above, according to the present invention, in a plurality one reference television camera is arbitrarily selected from the reference data obtained by photographing a predetermined object a reference data acquisition step of acquiring the in residual television camera, calculates an error between the image data and the reference color data obtained by photographing a predetermined object, the image data to eliminate the error comprising a correction data holding step for holding the correction data required to substantially coincide with the reference color data and, in the remainder of the television cameras, the correction data holding the image data obtained by photographing an object And output corrected image data. In the case of a reference television camera, image data obtained by photographing a subject is not corrected. In is configured to output.

[0039] Therefore, a special adjustment equipment is not required, labor required for adjustment by the adjusting device also can be omitted, it is possible to easily match colors with even simple operations such as in on location.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of a color matching system.

FIG. 2 is a block diagram showing a configuration of a television camera 200.

FIG. 3 shows television cameras 200b to 200n when an adjustment switch 250 is operated in the residual mode.
6 is a flowchart showing a processing operation executed by the microcomputer 245 of FIG.

[Description of Signs] 1 Color Matching System 100 Memory Card 200, 200a to 200n Television Camera 244 Memory 245 Microcomputer

Claims (3)

[Claims] 1. A color matching method for matching colors of images output from respective television cameras almost identically when each of the same subject is photographed by a plurality of television cameras. in one of the reference TV camera which is arbitrarily selected from the reference data obtaining step of obtaining reference data obtained by photographing a predetermined object, in the remainder of the television camera, taken from the reference television camera wherein An error calculating step of calculating an error between the reference data and image data obtained by photographing the predetermined subject with the remaining television camera; and resolving the error in the remaining television camera. Correction data required to make the image data taken by the television camera substantially coincide with the reference color data And a correction data storing step of calculating and storing the corrected image data. In the remaining television camera, image data obtained by photographing a subject is corrected based on the corrected data, and a corrected image is obtained. A color matching method, comprising: outputting data, and outputting, without correction, image data obtained by photographing a subject in a reference television camera. 2. A color matching system for matching the color of an image obtained by each television camera almost identically when each of the same subject is photographed by a plurality of television cameras. one reference television camera which is arbitrarily selected from comprises a reference data acquisition means for acquiring the reference data obtained by photographing a predetermined object, and a reference data output means for outputting said reference data to the outside, The remaining television camera includes reference data receiving means for capturing the reference data from the reference television camera, the captured reference data, and image data obtained by photographing the predetermined subject with the remaining television camera. Error calculating means for calculating an error between the image data and the image data captured by the remaining television camera by eliminating the error. Correction data holding means for calculating and holding correction data necessary for causing the data to substantially match the reference color data, and for a remaining television camera, an image obtained by photographing a subject. the data is corrected based on the correction data, and outputs the corrected image data, in the reference television camera outputs without correcting the image data obtained by photographing an object, that Characteristic color matching system. 3. A television camera capable of matching the color of an image obtained by another television camera with almost the same color when the same subject is photographed by a plurality of television cameras. A reference data receiving unit that captures reference data obtained by photographing a predetermined subject, and calculating an error between the reference color data and image data obtained by photographing a predetermined subject by the television camera. Error correction means, and correction data holding means for calculating and holding correction data necessary to make the image data taken by the television camera substantially coincide with the reference color data by eliminating the error. And correcting image data obtained by photographing the subject based on the correction data, and outputting corrected image data. Vision camera.