JPH09238359A - Color television camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce white jump by giving a white clip signal to a luminance signal matrix circuit and giving a signal not white clip to a color difference matrix circuit. SOLUTION: Gamma correction circuits 1, 4, 7 apply gamma correction to each of R, G, B image signals respectively, ν circuits 2, 5, 8 compress an image signal of 100% of a rated image signal level or over and the result is outputted respectively to white clip circuits 3, 6, 9 and a color difference matrix circuit 14. The white clip circuits 3, 6, 9 apply white clip to image signals whose level is 110% of the rated image signal level or over and provide an output of the result to a luminance signal matrix circuit 10. The R, G, B image signals subject to clip processing with high luminance are given to the luminance signal matrix circuit 10 in this way, but since each image signal subject to gamma correction and high luminance compression processing only is given to the color difference matrix circuit 14, an image signal without missing due to clip processing is given to a color signal processing system and white jump is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color television camera, and more particularly, to a color television camera for performing outdoor image pickup having a wide dynamic range of the amount of incident light, in which the identification of an object is enhanced. .

[0002]

2. Description of the Related Art As is well known, in a color television camera, incident light from a subject is red (hereinafter referred to as R) by a color separation optical device such as a color separation prism.
Green (hereinafter referred to as G) and blue (hereinafter referred to as B) 3
Color separation into primary colors and R, G, B in each R, G, B image sensor
Each image signal is photoelectrically converted, and R,
Required signal processing is performed on each of the G and B image signals to obtain a color image signal. FIG. 4 shows an image signal processing circuit which constitutes a color television camera according to the prior art and will be described. The image signal processing circuit shown in FIG.
Gamma correction, knee processing, white clip processing, and luminance signal until the R image signal, G image signal, and B image signal input from the G and B image pickup elements are matrixed according to the standard and output as a luminance signal and a color difference signal. Only the circuits that perform the matrix, the color difference signal matrix, etc. are described.

The structure of a conventional image signal processing circuit will be described. An R image signal input from an R image pickup device of a color television camera is input to a gamma correction circuit 1 and is gamma-corrected by the gamma correction circuit 1 to be a knee circuit. The signal output to the second circuit 2, the signal exceeding the predetermined level in the knee circuit 2 is knee processed (compressed) and output to the white clip circuit 3, and the signal exceeding the predetermined level in the white clip circuit 3 is white clipped to the luminance signal matrix circuit 10. It is output to the color difference signal matrix circuit 14. The G image signal input from the G image sensor of the color television camera is
The signal is input to the gamma correction circuit 4, is gamma-corrected by the gamma correction circuit 4, and is output to the knee circuit 5. The signal exceeding the predetermined level is knee-processed by the knee circuit 5 and output to the white clip circuit 6, which is then output by the white clip circuit 6. Signals exceeding a predetermined level are white clipped and output to the luminance signal matrix circuit 10 and the color difference signal matrix circuit 14. Further, the B image signal input from the B image sensor of the color television camera is input to the gamma correction circuit 7, is gamma-corrected by the gamma correction circuit 7, and is output to the knee circuit 8 so that the knee circuit 8 exceeds a predetermined level. Is subjected to knee processing and output to the white clip circuit 9, and a signal exceeding a predetermined level is white clipped by the white clip circuit 9 and output to the luminance signal matrix circuit 10 and the color difference signal matrix circuit 14.

In the color television camera having the image signal processing circuit configured as described above, the R, G and B image signals output from the R, G and B image pickup devices are input to the image signal processing circuit. . In the image signal processing circuit, R,
The G and B image signals are subjected to required gamma correction by gamma correction circuits 1, 4, and 7, respectively, and knee circuits 2, 5, and 8 are provided.
The image signals of 100% or more of the rated image signal level are respectively compressed by the white clip circuits 3, 6,
9 is output. In the white clip circuits 3, 6 and 9, signals exceeding 110% of the rated image signal level of the respective input image signals are clipped, and the processed R, G and B image signals are different from the luminance signal matrix circuit 10 in color difference. It is output to the matrix circuit 14. The luminance signal matrix-outputted from the luminance signal matrix circuit 10 and the color-difference signal matrix-outputted from the color-difference matrix circuit 14 according to the standard are processed by another circuit not shown to be a color image signal.

[0005]

In the color television camera according to the prior art, in the image signal processing circuit, an R, G, B high-luminance image signal exceeding the knee point and the white clip point, which means a predetermined level, is generated. When processed, there is no level difference between the R, G, and B image signals in each white clip circuit, and a whiteout phenomenon occurs in which no color signal is output. In particular, when an image is taken outdoors, there are problems that the color of the sky looks white and the details of a high-luminance object cannot be identified because the dynamic range of the amount of light incident from the object is wide. In order to solve the above-mentioned problems, the present invention inputs an image signal processing circuit of a color television camera, and inputs to a luminance signal matrix circuit R, G, B image signals which have been white clipped by a white clip circuit, and outputs a color difference signal. R which is not white clipped by the white clip circuit in the matrix circuit,
A circuit configuration for inputting G and B image signals is provided so that color signals are output even when R, G, and B high-luminance image signals are processed, and the color signals are superimposed on the details of the high-luminance subject. It is an object of the present invention to provide a color television camera with enhanced discrimination.

[0006]

In order to achieve the above-mentioned object, a color television camera of the present invention comprises a color separation optical device for color-separating incident light and a plurality of imaging devices for photoelectrically converting the color-separated incident light. In a color television camera including an element and an image signal processing circuit that processes a plurality of image signals output from the plurality of image pickup elements and outputs a luminance signal and a color difference signal, output from the plurality of image pickup elements. A plurality of gamma correction circuits for performing gamma correction on each of the plurality of image signals, and a plurality of knee circuits for performing knee processing on each of the plurality of gamma-corrected image signals input from the plurality of gamma correction circuits, A plurality of white clip circuits that perform white clip processing on each of the plurality of knee-processed image signals input from the plurality of knee circuits; A luminance signal matrix circuit that outputs a luminance signal by matrixing a plurality of white clip processed image signals input from a white clip circuit; and a matrix of a plurality of knee processed image signals input from the plurality of knee circuits. The image signal processing circuit having a color difference signal matrix circuit for outputting a color difference signal.

Further, the color television camera of the present invention includes a plurality of gamma correction circuits for performing gamma correction on each of a plurality of image signals output from a plurality of image pickup devices,
A plurality of knee circuits for performing knee processing on each of the plurality of gamma-corrected image signals input from the plurality of gamma correction circuits, and a white color for each of the plurality of knee-processed image signals input from the plurality of knee circuits. A plurality of white clip circuits that perform clip processing, a luminance signal matrix circuit that outputs a luminance signal by matrixing the plurality of white clip processed image signals input from the plurality of white clip circuits, and the plurality of gamma correction circuits A plurality of gamma-corrected image signals inputted from the plurality of knee circuits having different compression rates for performing knee processing at a compression rate different from that of the knee circuit, and a plurality of knee circuits having different compression rates inputted from the plurality of knee circuits. A color-difference signal matrix circuit that outputs a color-difference signal by matrixing the knee-processed image signal Those having a serial image signal processing circuit.

Further, the color television camera of the present invention includes a plurality of gamma correction circuits for performing gamma correction on each of a plurality of image signals output from a plurality of image pickup devices,
A plurality of knee circuits for performing knee processing on each of the plurality of gamma-corrected image signals input from the plurality of gamma correction circuits, and a white color for each of the plurality of knee-processed image signals input from the plurality of knee circuits. A plurality of white clip circuits that perform clip processing, a luminance signal matrix circuit that outputs a luminance signal by matrixing the plurality of white clip processed image signals input from the plurality of white clip circuits, and the plurality of gamma correction circuits A plurality of subtraction circuits for respectively subtracting a plurality of white clip processed image signals input from the plurality of white clip circuits from a plurality of gamma-corrected image signals input from To the multiple white clip processed image signals input from A matrix of a plurality of addition circuits that perform a process of adding a plurality of subtracted image signals input from a plurality of subtraction circuits at a required ratio, and a plurality of addition processed image signals input from the plurality of addition circuits And the image signal processing circuit having a color difference signal matrix circuit for outputting color difference signals.

The operation of the present invention will be described. The image signal processing circuit included in the color television camera of the present invention includes a plurality of image signals output from the plurality of image pickup devices by a plurality of gamma correction circuits. Gamma correction is performed on each of the plurality of gamma correction circuits, and the plurality of gamma-corrected image signals input from the plurality of gamma correction circuits are subjected to knee processing, and the plurality of white clip circuits input the plurality of knee circuits. Performs white clip processing on each of the plurality of knee-processed image signals,
The luminance signal matrix circuit matrixes a plurality of white clip processed image signals input from the plurality of white clip circuits to output a luminance signal, and the color difference signal matrix circuit inputs a plurality of knee processes input from the plurality of knee circuits. The color difference signals are output by the color difference signal matrix circuit even if a high-luminance image signal that causes white clipping by the white clip circuit is input. It reduces the jump phenomenon.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A first embodiment of a color television camera according to the present invention will be described with reference to FIG.
FIG. 1 shows a color separation optical device for collecting light from an incident subject,
For example, a color separation prism is used to perform color separation into three primary colors of red (hereinafter, referred to as R), green (hereinafter, referred to as G), and blue (hereinafter, referred to as B), and image pickup for R, G, and B is performed. An image signal processing circuit that constitutes a color television camera that photoelectrically converts R, G, and B image signals by an element, performs required signal processing on each of the R, G, and B image signals, and outputs a color image signal is shown. ing. The image signal processing circuit processes the R, G, B image signals input from the R, G, B image pickup devices, matrixes them according to the standard, and outputs them as luminance signals and color difference signals. , Only circuits that perform white clip processing, a luminance signal matrix, a color difference signal matrix, and the like are described.

The structure of the image signal processing circuit will be described with reference to FIG. 1. The R image signal input from the R image pickup element of the color television camera is input to the gamma correction circuit 1 and gamma corrected by the gamma correction circuit 1. A signal that is output to the knee circuit 2 and that exceeds a predetermined level in the knee circuit 2 is knee processed (compressed) and output to the white clip circuit 3 and the color difference signal matrix circuit 14, and the white clip circuit 3
The signal exceeding the predetermined level is white clipped and output to the luminance signal matrix circuit 10.

The G image signal input from the G image pickup device of the color television camera is input to the gamma correction circuit 4 and is gamma-corrected by the gamma correction circuit 4 to be knee circuit 5.
To the white clip circuit 6 and the color difference signal matrix circuit 14, and the signal exceeding the predetermined level is white clipped to the luminance signal. It is output to the matrix circuit 10.

Further, the B image signal input from the B image pickup device of the color television camera is input to the gamma correction circuit 7, is gamma-corrected by the gamma correction circuit 7 and is output to the knee circuit 8 and is predetermined by the knee circuit 8. The signal exceeding the level is knee-processed and output to the white clip circuit 9 and the color difference signal matrix circuit 14, and the white clip circuit 9
The signal exceeding the predetermined level is white-clipped and output to the luminance signal matrix circuit 10.

In the color television camera having the image signal processing circuit configured as described above, the R, G and B image signals output from the R, G and B image pickup elements are input to the image signal processing circuit. . In the image signal processing circuit, R,
The G and B image signals are subjected to required gamma correction by gamma correction circuits 1, 4, and 7, respectively, and knee circuits 2, 5, and 8 are provided.
The image signals of 100% or more of the rated image signal level are respectively compressed by the white clip circuits 3, 6,
9 and the color difference matrix circuit 14. In the white clip circuits 3, 6 and 9, signals exceeding 110% of the rated image signal level of the input image signals are white clipped, and the processed R, G and B image signals are sent to the luminance signal matrix circuit 10. Is output.

The luminance signal matrix-outputted from the luminance signal matrix circuit 10 according to the standard and the color-difference signal matrix-outputted from the color difference matrix circuit 14 according to the standard are processed by another circuit not shown,
It becomes a color image signal. Therefore, the R, G, and B image signals that have been subjected to high-luminance clipping processing by the white clip circuits 3, 6, 9 are input to the luminance signal matrix circuit 10, but the gamma correction is performed on the color difference matrix circuit 14. The circuits 1, 4, 7 and the knee circuits 2, 5, 8 perform R, G, and B in which only gamma correction and high-luminance compression processing (knee processing) are performed.
Since each image signal is input, an image signal that has no omission due to clipping processing is input to the color signal processing system, and the whiteout phenomenon is reduced.

[Second Embodiment] A second embodiment of the color television camera according to the present invention will be described with reference to FIG. FIG. 2 shows that light from an incident subject is converted into R, G, B by a color separation optical device, for example, a color separation prism.
Color separation into the three primary colors of R, G, and B, and R,
An image signal processing circuit which constitutes a color television camera which photoelectrically converts G and B image signals, performs required signal processing on the R, G and B image signals and outputs a color image signal is shown. The image signal processing circuit processes the R, G, and B image signals input from the R, G, and B image pickup devices, and matrixes them into a luminance signal and a color difference signal according to the standard.
Only the circuits that perform gamma correction, knee processing, white clip processing, luminance signal matrix, color difference signal matrix, etc. are described.

The structure of the image signal processing circuit will be described with reference to FIG. 2. The R image signal input from the R image sensor of the color television camera is input to the gamma correction circuit 1 and gamma corrected by the gamma correction circuit 1. The R image signal output to the knee circuit 2 and the knee circuit 2 and the knee circuit 11 having different compression rates, and the R image signal input to the knee circuit 2 is subjected to knee processing for signals exceeding a predetermined level in the knee circuit 2 and white clipped. The signal output to the circuit 3 and exceeding the predetermined level in the white clip circuit 3 is white clipped and output to the luminance signal matrix circuit 10. On the other hand, the R image signal input to the knee circuit 11 having a compression rate different from that of the knee circuit 2 is subjected to knee processing of a signal exceeding a required level in the knee circuit 11 and output to the color difference signal matrix circuit 14.

Further, the G image signal input from the G image pickup device of the color television camera is input to the gamma correction circuit 4, and the gamma correction circuit 4 performs gamma correction on the G image signal to obtain the knee circuit 5.
Of the G image signal input to the knee circuit 5 is output to the knee circuit 5 and the knee circuit 12 having a different compression rate. The signal output and exceeding the predetermined level in the white clip circuit 6 is white clipped and output to the luminance signal matrix circuit 10. The other,
G input to the knee circuit 5 and the knee circuit 12 having a different compression rate
As for the image signal, a signal exceeding a required level is knee-processed in the knee circuit 12 and is output to the color difference signal matrix circuit 14.

Further, the B image signal input from the B image pickup element of the color television camera is input to the gamma correction circuit 7 and is gamma-corrected by the gamma correction circuit 7 so that the knee circuit 8 and the knee circuit 8 have different compression rates. One of the B image signals output to the knee circuit 13 and input to the knee circuit 8 is subjected to knee processing for a signal exceeding a predetermined level in the knee circuit 8 and output to the white clip circuit 9 and then to the white clip circuit 9. The signal exceeding the level is white clipped and output to the luminance signal matrix circuit 10. On the other hand, the B image signal input to the knee circuit 13 having a different compression rate from that of the knee circuit 8 is subjected to knee processing of a signal exceeding a required level in the knee circuit 13 and output to the color difference signal matrix circuit 14.

In the color television camera having the image signal processing circuit configured as described above, the R, G, B image signals output from the R, G, B image pickup devices are input to the image signal processing circuit. . In the image signal processing circuit, R,
The G and B image signals are subjected to required gamma correction by gamma correction circuits 1, 4, and 7, respectively, and knee circuits 2, 5, and 8 are provided.
The image signals of 100% or more of the rated image signal level are respectively compressed by, and in the white clip circuits 3, 6 and 9,
1 of the rated image signal level of each input image signal
Signals exceeding 10% are white clipped, and the processed R, G, and B image signals are luminance signal matrix circuits 10.
Output to On the other hand, the knee circuit 11 having a different compression rate,
Image signals having a required signal level or higher are respectively compressed in 12 and 13, and the processed R, G, and B image signals are output to the color difference signal matrix circuit 14.

The luminance signal matrix-outputted from the luminance signal matrix circuit 10 according to the standard and the color-difference signal matrix-outputted from the color difference matrix circuit 14 according to the standard are processed by another circuit not shown to be a color image signal. . Therefore, the R, G, and B image signals that have been subjected to high-luminance clipping processing by the white clip circuits 3, 6, 9 are input to the luminance signal matrix circuit 10, but the gamma signal matrix circuit 14 does Knee circuits 11, 12, 13 having different compression ratios from the correction circuits 1, 4, 7
And, the R, G, and B image signals that have undergone only gamma correction and high-luminance compression processing (knee processing) are input, and the image signals that have been compressed at the required compression rate without missing due to clipping processing are color signals. Since it is input to the processing system, the color reproducibility of the high-brightness signal is more arbitrarily improved, and the whiteout phenomenon is reduced.

[Third Embodiment] A third embodiment of the color television camera according to the present invention will be described with reference to FIG. FIG. 3 shows that light from an incident subject is converted into R, G, B by a color separation optical device, for example, a color separation prism.
Color separation into the three primary colors of R, G, and B, and R,
An image signal processing circuit which constitutes a color television camera which photoelectrically converts G and B image signals, performs required signal processing on the R, G and B image signals and outputs a color image signal is shown. The image signal processing circuit processes the R, G, and B image signals input from the R, G, and B image pickup devices, and matrixes them into a luminance signal and a color difference signal according to the standard.
Only the circuits that perform gamma correction, knee processing, white clip processing, luminance signal matrix, color difference signal matrix, etc. are described.

The structure of the image signal processing circuit will be described with reference to FIG. 3. The R image signal input from the R image sensor of the color television camera is input to the gamma correction circuit 1 and is gamma corrected by the gamma correction circuit 1. R output to the knee circuit 2 and the subtraction circuit 15 and input to one of the knee circuits 2
As for the image signal, a signal exceeding a predetermined level is knee processed by the knee circuit 2 and output to the white clip circuit 3, and a signal exceeding the predetermined level is white clipped by the white clip circuit 3 and is luminance-clip matrix circuit 10 and a subtraction circuit. 15 and the addition circuit 16. Subtraction circuit 15
Performs a process of subtracting the white clipped R image signal from the gamma-corrected R image signal, outputs the subtracted signal to the adder circuit 16, and adds it to the white clipped R image signal at a required ratio. It is processed and output to the color difference signal matrix circuit 14.

Further, the G image signal input from the G image pickup device of the color television camera is input to the gamma correction circuit 4, and the gamma correction circuit 4 performs gamma correction on the G image signal to obtain the knee circuit 5.
One of the G image signals input to the knee circuit 5 is output to the white clip circuit 6, and the G image signal input to the knee circuit 5 is output to the white clip circuit 6. Signals exceeding a predetermined level are white clipped and the luminance signal matrix circuit 1
It is output to 0, the subtraction circuit 17, and the addition circuit 18. The subtraction circuit 17 performs a process of subtracting the white clipped G image signal from the gamma-corrected G image signal, outputs the subtracted signal to the addition circuit 18, and outputs the white clipped R image signal with a required ratio. Then, the color difference signal matrix circuit 14 outputs the color difference signal matrix circuit 14.

Further, the B image signal input from the B image pickup device of the color television camera is input to the gamma correction circuit 7, is gamma corrected by the gamma correction circuit 7, and is output to the knee circuit 8 and the subtraction circuit 19. On the other hand, the B image signal input to the knee circuit 8 is knee-processed for the signal exceeding the predetermined level in the knee circuit 8 and output to the white clip circuit 9, and the signal exceeding the predetermined level in the white clip circuit 9 is white clipped. It is output to the luminance signal matrix circuit 10, the subtraction circuit 19 and the addition circuit 20. The subtraction circuit 19 performs a process of subtracting the white clipped B image signal from the gamma-corrected B image signal,
The subtracted signal is output to the addition circuit 20, the white clipped B image signal is added at a required ratio, and the result is output to the color difference signal matrix circuit 14.

In the color television camera having the image signal processing circuit configured as described above, the R, G, B image signals output from the R, G, B image pickup devices are input to the image signal processing circuit. . In the image signal processing circuit, R,
The G and B image signals are subjected to required gamma correction by gamma correction circuits 1, 4, and 7, respectively, and knee circuits 2, 5, and 8 are provided.
The image signals of 100% or more of the rated image signal level are respectively compressed by, and in the white clip circuits 3, 6 and 9,
1 of the rated image signal level of each input image signal
Signals exceeding 10% are white clipped, and the processed R, G, and B image signals are luminance signal matrix circuits 10.
And subtraction circuits 15, 17, 19 and addition circuits 16, 18, 2
It is output to 0 and. The subtraction circuits 15, 17 and 19 perform processing for subtracting the white clipped R, G and B image signals from the gamma-corrected R, G and B image signals, and the subtraction processed signal is added to the addition circuit 16, It outputs to the color difference signal matrix circuit 14 after performing processing for adding to the white-clip R, G, and B image signals at a required ratio.

The luminance signal matrix-outputted from the luminance signal matrix circuit 10 according to the standard and the color-difference signal matrix-outputted from the color difference matrix circuit 14 according to the standard are processed by another circuit not shown to be a color image signal. . Therefore, the R, G, and B image signals that have been subjected to high-luminance clipping processing by the white clip circuits 3, 6, 9 are input to the luminance signal matrix circuit 10, but the gamma signal matrix circuit 14 does The correction circuits 1, 4, and 7 and the knee circuits 11, 12, and 13 perform only gamma correction and high-luminance compression processing (knee processing) R,
The G and B image signals are input, and the image signals that are not missing due to clipping processing are input to the color signal processing system at the required ratio, so the color reproducibility of high-brightness signals is further improved, and the whiteout phenomenon is reduced. To be done.

[0028]

According to the present invention, the image signal processing circuit of the color television camera and the luminance signal matrix circuit are supplied with the R, G and B image signals which have been white clipped by the white clip circuit, and the color difference signal is inputted. The matrix circuit has a circuit configuration for inputting R, G, B image signals that have not been white clipped by the white clip circuit, and color signals are output even when the R, G, B high-luminance image signals are processed, resulting in high luminance. It is possible to provide a color television camera in which a color signal is superimposed on the details of the subject and the identification of the subject is enhanced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of an image signal processing circuit constituting a color television camera according to the present invention.

FIG. 2 is a block diagram showing a second embodiment of an image signal processing circuit which constitutes a color television camera according to the present invention.

FIG. 3 is a block diagram showing a third embodiment of an image signal processing circuit which constitutes a color television camera according to the present invention.

FIG. 4 is a block diagram showing an embodiment of an image signal processing circuit which constitutes a conventional color television camera.

[Explanation of Codes] 1, 4, 7 ... Gamma correction circuit 2, 5, 8, 11, 1
2, 13 ... Knee circuit, 3, 6, 9 ... White clip circuit, 10 ... Luminance signal matrix circuit, 14 ... Color difference signal matrix circuit, 15, 17, 19 ... Subtraction circuit, 16, 1
8, 20 ... Adder circuit.

Claims (3)

[Claims] 1. A color separation optical device for color-separating incident light,
A color television including a plurality of image pickup devices for photoelectrically converting color-separated incident light, and an image signal processing circuit for processing a plurality of image signals output from the plurality of image pickup devices and outputting a luminance signal and a color difference signal. In the John camera, a plurality of gamma correction circuits that perform gamma correction on each of the plurality of image signals output from the plurality of image pickup devices, and each of the plurality of gamma-corrected image signals input from the plurality of gamma correction circuits A plurality of knee circuits for performing a knee process, a plurality of white clip circuits for performing a white clip process on each of the plurality of knee-processed image signals input from the plurality of knee circuits, and an input from the plurality of white clip circuits Luminance signal matrix that outputs a luminance signal by matrixing multiple white clipped image signals A color television set comprising: a circuit; and a color difference signal matrix circuit that outputs a color difference signal by matrixing a plurality of knee-processed image signals input from the plurality of knee circuits. John camera. 2. A color separation optical device for color-separating incident light,
A color television including a plurality of image pickup devices for photoelectrically converting color-separated incident light, and an image signal processing circuit for processing a plurality of image signals output from the plurality of image pickup devices and outputting a luminance signal and a color difference signal. In the John camera, a plurality of gamma correction circuits that perform gamma correction on each of the plurality of image signals output from the plurality of image pickup devices, and each of the plurality of gamma-corrected image signals input from the plurality of gamma correction circuits A plurality of knee circuits for performing a knee process, a plurality of white clip circuits for performing a white clip process on each of the plurality of knee-processed image signals input from the plurality of knee circuits, and an input from the plurality of white clip circuits Luminance signal matrix that outputs a luminance signal by matrixing multiple white clipped image signals A plurality of gamma-corrected image signals input from the plurality of gamma correction circuits, and a plurality of knee circuits having different compression ratios for performing knee processing at a compression ratio different from that of the knee circuit, and the plurality of compression ratios. And a color difference signal matrix circuit that outputs a color difference signal by matrixing a plurality of knee-processed image signals input from different knee circuits. 3. A color separation optical device for color-separating incident light,
A color television including a plurality of image pickup devices for photoelectrically converting color-separated incident light, and an image signal processing circuit for processing a plurality of image signals output from the plurality of image pickup devices and outputting a luminance signal and a color difference signal. In the John camera, a plurality of gamma correction circuits that perform gamma correction on each of the plurality of image signals output from the plurality of image pickup devices, and each of the plurality of gamma-corrected image signals input from the plurality of gamma correction circuits A plurality of knee circuits for performing a knee process, a plurality of white clip circuits for performing a white clip process on each of the plurality of knee-processed image signals input from the plurality of knee circuits, and an input from the plurality of white clip circuits Luminance signal matrix that outputs a luminance signal by matrixing multiple white clipped image signals A plurality of gamma-corrected image signals input from the plurality of gamma-correction circuits, and a plurality of subtractions for performing a process of subtracting a plurality of white-clip processed image signals input from the plurality of white-clip circuits, respectively. A circuit and a process of adding a plurality of subtracted image signals input from the plurality of subtraction circuits to the plurality of white clip processed image signals input from the plurality of white clip circuits at a required ratio. The image signal processing circuit comprises: a plurality of addition circuits; and a color difference signal matrix circuit that outputs a color difference signal by matrixing a plurality of addition-processed image signals input from the plurality of addition circuits. Color television camera.