JPS6373789A - Output controller for electronic still camera - Google Patents

Abstract

PURPOSE:To obtain a video signal representing an excellent picture by compensating the quantity of incident light of a solid-state image pickup device, the difference in sensitivity from a photodetecting means to a color temperature and the change in a white balance. CONSTITUTION:According to the quantity of the incident light detected the photodetecting element 36 and the color temperature detected by a color temperature detecting part 78, the opening degree of a diaphragm 14, the opening time of a shutter 18 and the gain of the variable gain amplifier of a color separating gain adjusting part 50 are decided by the data of a lock up table 132, thereby, a constant output is obtained and the white balance is adjusted. Accordingly, a constantly fixed G signal output or a Y signal output can be obtained from the solid-state image pickup device 22, the white balance can be correctly adjusted according to the quantity of exposure and the color temperature of the adjusted incident light and the video signal representing the excellent picture can be obtained from an output 62.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an electronic still camera, particularly to a solid-state imaging device thereof, which maintains a constant output level of a color video signal and adjusts the exposure and gain so that the white balance of the color video signal is lJx. The present invention relates to an output control device for controlling.

BACKGROUND ART As the name suggests, an electronic still camera can obtain a video signal of only one field or one frame exposed by opening a shutter. In order to obtain an appropriate reproduced image, that is, a visually natural reproduced image, appropriate exposure and appropriate white balance adjustment are required. In electronic still cameras,
Appropriate exposure and appropriate white balance must always be obtained for such a single shot video signal. Appropriate exposure means that the luminance signal or G signal obtained from the solid-state imaging device used exhibits a substantially constant level regardless of the light intensity of the object field. Also.

Excessive white balance adjustment is R for 12 achromatic images.
This is to control the levels of the G83 color signals to be approximately equal.

Therefore, exposure control for electronic still cameras uses a method similar to that of conventional silver-halide film still cameras. For example, the light transmitted through the photographing lens is controlled by a photodiode at 114 ffiL, and the shutter and aperture values are adjusted accordingly.
A method is used to control the appropriate exposure for the image device.

Regarding white balance adjustment, for example, a method used in some video cameras is a method in which the amplifier gain of the RGB video signal is adjusted by detecting the RB color first light component ratio with a color temperature detector. In video and video movie cameras, the aperture value is usually controlled by feedback from the video signal so that the output level of the I2 image signal is constant, and the amplifier gain is feedback-controlled so that the output level of the auto iris and RGB signals is uniform. You are using automatic white balance. However, electronic still cameras require quick response in order to obtain a single shot image, so such a feedback control system for movies cannot be used.

Solid-state imaging devices such as charge-coupled devices (CAPs) used as imaging devices in electronic still cameras have a narrower dynamic range than ordinary silver halide photographic film, and solid-state imaging devices and photometric photodiodes have a narrower color temperature. As a result, the sensitivity of the G signal or luminance signal recedes, so even if the light transmitted through the photographic lens is measured with a photodiode and the exposure is controlled by adjusting the shutter and aperture values accordingly, solid-state imaging will not work. It was not possible to make the luminance signal or G signal obtained from the device constant.

For example, the phototype for IIIX is a CCD
The photosensitive characteristics are different from solid-state imaging devices such as

:JS5 and E6 show differences in the output of the CCD sensor depending on the color temperature when the output of the auto-iris sensor is kept constant in the case of a silicon photodiode.

As can be seen from FIG. 45, the output of the G signal changes with changes in color temperature. For example, when the color temperature is low, about 3000"K, the sensitivity of the G signal of the CCD sensor is low, so the output is low.

In addition, as shown in FIG. 6, the j11 signal Y(0,3
R, 0,590 x 0.11B) output (dotted chain line) also changes due to changes in color temperature, and when the color temperature is low, around 3000"K, the output is low because the sensitivity of the luminance signal of the CCD sensor is low. .

Therefore, in a method that adjusts the shutter and aperture according to the photometric value of a photometric element, such as a photodiode, depending on the bias of the spectral components of the incident light from the subject,
The level of the G signal or the luminance signal of the output signal from the CCD imaging device is not adjusted to an appropriate deviation, and therefore it is sometimes impossible to obtain a video signal representing a good image.

For example, when the color temperature is around 3000°, the sensitivity of the CCD imaging device is low, so adjust the shutter and aperture values so that the G signal or brightness signal is constant according to the photometry A4 of the photometry element. Also, the output of the G signal or luminance signal from the CCD imaging device becomes low and does not become negative.

However, in the conventional white balance adjustment method, the R signal and the B signal are adjusted so that the integral level of the R signal and the B signal is almost brighter than the G signal among the color 12 image signals obtained from the solid-state imaging device. For example, out of the three-separated color signals RGB obtained from a solid-state imaging device, the R and B signals are each input to a variable gain amplifier, and the output side adjusts the output signal. monitor the average level and detect the difference between the two. By adjusting the gains of both variable gain amplifiers according to the difference thus detected and repeating this feedback, the integral levels of the R signal and the B signal are made approximately equal. As will be explained below, this white balance adjustment method corrects the RBB4O level using the G signal as a reference.

However, the sensitivity of the G signal of a solid-state TIAS device differs depending on the color temperature as described above with respect to the output of the photodiode, and is not constant.
The signal output is adjusted to be constant, and the constant G
It is necessary to correct the RBB4O level using the signal as a reference, but if, for example, the exposure amount is controlled so that the G signal is constant, the sensitivity due to the RBB4O color temperature will change as the exposure amount changes, so the white balance 'jA! R for I
The BB4O correction amount also changed, making it impossible to obtain an appropriate white balance.

Purpose The present invention eliminates the drawbacks of the prior art, eliminates unevenness in output caused by differences in sensitivity characteristics to color temperature between photometric elements and solid-state imaging devices, and adjusts appropriate white balance. Therefore, it is an object of the present invention to provide an output control WJA device for controlling exposure and gain of an electronic still camera.

DISCLOSURE OF THE INVENTION According to Akira A., there is an output control for controlling the output signal level and white balance of an electronic still camera that images a subject using a solid-state imaging device and forms a color video signal representing the image of the subject. The device includes an exposure control means that controls the exposure amount of an electronic still camera, a variable amplification means that amplifies each separated color signal of a color video signal and can adjust the amplification gain for each separated color signal, and Entering IB from
A light detection means that receives light and outputs a first signal according to the amount of incident light, and a color of the scene 8! color temperature detection means for measuring the color temperature and outputting a second signal according to the color temperature, and control means for controlling the exposure control means and the variable amplification means according to the first and second signals. , the control by the control means sets the output of the child still camera to one pair so as to compensate for the difference in sensitivity between the solid-state imaging device and the light detection means and the change in white balance due to the amount of incident light and color temperature of the solid-state imaging device, In addition, the output is output with the white balance adjusted.

DESCRIPTION OF EMBODIMENTS Next, an embodiment of an output control device for a still camera according to the present invention will be explained in detail with reference to the accompanying drawings.

Referring to FIG. 1, an electronic still camera to which an embodiment of the output control device according to the present invention is applied has an imaging optical system 10, which includes an imaging lens 12, an aperture 14, a beam splitter 16, and a shutter. 18 is disposed on the optical axis 20 of the lens 12 as shown. For example, behind the shutter 18.

A solid-state imaging device 22 such as a CCD is provided.

The imaging lens 12 forms an image of the field on the imaging cell array 24 of the solid-state imaging device 22 . The aperture 14 is an exposure adjustment mechanism that adjusts the amount of light incident on the imaging cell array 24, and the aperture is driven by the aperture drive unit 2, as indicated by a dotted line 26. Beam splitter 16 is arranged at 45° to optical axis 12 and splits a portion 30 of the incident light from lens 12 . A photodetection element 36 is disposed at the end of the branched light 30 via a lens 32. The shutter 18 is an exposure mechanism that exposes the image pickup cell array 24, and as shown by a one-dot line 38, the shutter is activated! 13
Its opening and closing is controlled by the section 40.

The photodetecting element 3B is a photodiode in this embodiment, and is connected to the input of the logarithmic amplifier 42. lens 3
2 converges the branched light 30 onto the light receiving portion of the photodetecting element 38 . As a result, the photodetecting element 3B performs a TTL photometry function that exhibits a conductive state depending on the amount of light incident on the imaging lens 12.

The solid-state imaging device 22 is a CCD color imaging device in this embodiment, and its human power 44 is driven by the synchronization generation circuit 4.
The video signal output 48 is connected to the color separation gain adjustment section 50. The synchronization signal generation circuit 46 has a reference oscillator that runs free at a stable frequency, and outputs the horizontal and vertical drive clocks necessary for driving the solid-state imaging device 22 to the output 44, and also outputs the horizontal and vertical synchronization signals to the output 44. Output to output 52. Solid-state imaging device 22
When the shutter 18 is opened, charges corresponding to the subject image exposed on the imaging cell array 24 are accumulated, and the driving force 4 is
In response to the drive clock from 4, a color video signal corresponding to the charge is outputted to an output 48.

The color separation gain adjustment section 50 is as shown in FIG.

In this embodiment, the color video signal inputted from the solid-state imaging device 22 to the input 48 is amplified, and in response to the synchronization signal received from the synchronization generation circuit 46 to the synchronization input 52, the color human-powered video signal is divided into RGB. It has a preamplification color separation circuit 120 that separates color signals. The circuit 120 outputs an R signal to an output 122R, a G signal to an output 122G, and a B signal to an output 122B.

These outputs 122R, 122G and 122B are connected to variable gain amplifiers 124R, 1124G and 124, respectively.
Connected to B. Variable gain Mij width amplifier 124R11
24G and 124B have their gains independently variable, and are connected to the overall control unit 5 through control lines 5EIR158G and 56B included in the control line 56 from the overall control unit 58.
It can be set from 8. Variable gain amplifier 124R112
4G and 124B amplify the video signal with a respective set gain and output it to the corresponding outputs 54R, 54G and 54B.

The output 54 of the color separation gain adjustment section 50 is connected to the matrix circuit 60.
is connected to the input of In this embodiment, the matrix circuit 60 receives a luminance signal Y and color difference signals R-Y, B from the three prior art RGB input from the color separation gain adjustment section 50.
-Y and outputs them at output 62. The luminance signal Y is generated by combining the incident light components of these three colors according to a predetermined combining rule, for example, combining rule Y=0.11B+0.59G+0
．． Created by combining with 3OR.

Note that the color difference signals R-Y and B-Y are output in scanning line sequential order.

The logarithmic amplifier 42 is an amplifier that logarithmically compresses the output signal from the photodetector 36 and outputs it to its output 64.
4 is connected to the input port of the auto iris (AE) control section 6B. In this embodiment, the AE control unit 68
A processing system, for example a microprocessor, is advantageously used, having an analog-to-digital converter for converting the signal at input 64 into corresponding digital data. A
Output ports 8 and 70 of the E control unit 66 are connected to the aperture drive unit 28 and the shirt tough movement unit 40, respectively.

The AE control unit 86 outputs a signal representing the amount of light measured by the photodetector 3B to the overall control unit 58, and also controls the aperture drive unit according to a signal representing the corrected amount of light sent from the overall control unit 58 as described later. 28 and shutter drive unit 40
This is a control function section that realizes a movement exposure function that controls the exposure of the imaging cell array 24.

Each of these parts of this device is controlled by an overall control section 58. This electronic still camera has 7 shirt release buttons.
2, the output cuff 4 of which is connected to the input port of the overall control section 58. The overall control J [158 includes a storage section 13 that stores data and programs necessary for controlling this device.
0 is connected. The storage unit 130 includes a photodetector 36
The diaphragm drive unit 28 and the shutter drive unit 4
0, variable gain amplifier 124R2124G and 124B
A lookup table 132 is stored for creating signals to control the . In this embodiment, the overall control section 58 and the storage section 130 are also advantageously configured with a processing system such as a microprocessor, and perform AE control in response to a shirt release signal sent from the shirt release button 72 through a control line 74. This is a control mechanism that controls the unit 6B, the color separation gain adjustment unit 50, and the matrix circuit 60, thereby performing photographing, that is, exposing the imaging cell array 24 and reading out video signals from the solid-state imaging device 22.

The color temperature detection section 7B of the overall control section 58 includes a color temperature detection section 7B.
The 0 color temperature detection unit 78 to which the output cuff 6 of 8 is connected is,
As shown in FIG. 3, a color temperature detection section 78 having a color temperature detection section 78 that measures the color temperature of the object and outputs the data to the output cuff 6 is connected to an optical aperture 80 for color temperature measurement. Light incident from the field is detected by photodiodes 142R and 142B, respectively, through an R filter 140R and a B filter 140B. The R filter 140R is an optical filter that throws an R-like light, and a B filter 140B is disposed in parallel to this to divide the optical aperture into two.

B filter 140B.

It is an optical filter that transmits sunlight.

Photodiodes 142R and 142 respond to the incident light that passes through R filter 140R and B filter 140B.
The current flowing through B is the logarithmic amplifier 144R and 144B.
The signals are each logarithmically compressed and input to the differential amplifier 14B. Differential amplifier 146 has both power 148R and 14
An output corresponding to the 8B difference is generated at its output 150, which is input to an analog-to-digital converter (ADC) 152. The analog-to-digital converter 152 converts this into digital data representing the difference between the two color components R and B, and outputs it to the output cuff B as color temperature data of the scene.

FIG. 4 shows the relationship between the output of the color temperature detection unit 78 and the color temperature. As shown in the figure, when the color temperature is high, that is, when the mired (105/color temperature Tc) is small, the color temperature detection unit The output from 78 is large.

The overall control unit 56 reads out the lookup table 132 from [7i1! As a result, signals for controlling the aperture 14, shutter 18, variable gain amplifiers 124R, 1124G and 124B are created, and signals for controlling the drive of the aperture 14 and shutter 18 are output to the AE control section 86, and at the same time, the variable gain amplifiers 124R, 124G and A signal 58 controlling the gain of 124B is output to variable gain amplifiers 124R, 124G and 124B.

When creating a signal for controlling the driving of the aperture 14 and shutter 18 in the overall control section 5B using the lookup table 132, the signal 64 representing the amount of light obtained from the AE control section 6B is obtained from the color temperature detection section 78. The aperture drive is corrected using the signal 76 representing the corrected color temperature, and the aperture drive is corrected based on the corrected amount of light. 171 section 28 and shutter drive section 40
A signal 68.70 is created to control the . ``This correction of the amount of light is performed using a look-up table consisting of data as shown by the dotted line in FIG. 5, for example. As shown by the solid line in FIG. 5, the solid-state imaging device 22 has low sensitivity to the G component when the color temperature is low. G of COD sensor at
The reduction in signal sensitivity is compensated for, and correction is made to increase the G signal at low color temperatures, that is, to increase the amount of light incident on the solid-state imaging device 22.

Therefore, for example, in the overall control section 58, when the color temperature according to the signal from the color temperature detection section 78 is low, the AE
The data on the amount of light sent from the control section 68 is corrected so as to be smaller. According to the corrected light amount data, a signal is created to control the aperture drive section 28 and shutter drive section 40 to further increase the exposure amount, and the AE control [1118
Output to B. As a result, the aperture 14 and shutter 18
is controlled to further increase the exposure amount, and the amount of light incident on the solid-state imaging device 22 increases. As shown by the χ line in FIG. 5, the solid-state imaging device 22 has low sensitivity to the G component when the color temperature is low, so the output of the G component can be reduced by increasing the amount of incident light. Can be done.

The overall control unit 58 also controls the variable gain amplifier 124R1124G and 124
The B gain is adjusted independently for each of the three colors, so that video signals are output from the outputs 54R, 54G, and 54B at approximately equal integration levels for each of the RGB colors. This adjusts the white balance of the video signal. That is, the curve 170 of the three trees in FIG.
R, 170G and 170B are substantially the same regardless of color temperature, and the color temperature changes are flat &117
The gains of variable gain amplifiers 124R, 1124G and 124B are adjusted so as to obtain zero.

In this case, due to the change in the amount of incident light due to the control of the amount of light 'iA by the aperture 14 and shutter 18, ';
Since the sensitivity changes depending on the color temperature in Figure 5, the gain adjustment of the variable gain amplifiers 124R, 1124G and 124B is as follows:
This is done with this in mind.

In addition, in order to adjust the white balance, the output 54 of each RGB color is
When R, 54G, and 54B are adjusted, the level of the G signal or a luminance signal (described later) will be different from the level adjusted by the aperture 14 and shutter 18, so this error can be eliminated to keep the G signal or luminance signal constant. The data in the lookup table 132 is set so that it can be used. Therefore, the variable gain amplifier 124R11 obtained by the lookup table 132
The signal controlling the gain RGB of 24G and 124B is:
The white balance is adjusted by equalizing the average level of the outputs 54R, 54G, and 54B of each RGB color, and the above-mentioned aperture 14 and shutter 18 are adjusted by adjusting the white balance.
It also corrects errors that appear in the exposure amount, which is kept constant through control.

The color temperature sensitivity of the luminance signal Y created by the matrix circuit 60 based on the output from the solid-state imaging device 22 is shown in FIG. When the exposure is controlled by M, the decrease in sensitivity of the COD sensor (when the color temperature is low) is calculated using the lookup table 132 read out from the section 130, as in the case of the G signal described above. At the same time, the gains RG of the variable gain amplifiers 124R, 124G, and 124B are adjusted as indicated by the dotted lines in the figure.
Control B and adjust its own balance.

Note that FIG. 1 does not show the recording function part of the electronic still camera realized as an embodiment of the present invention, that is, the unit β that records the video signal of the output 62 on a video signal recording medium such as a video floppy. This is not directly related to the understanding of the present invention and has been omitted to avoid complicating the diagram and explanation, but in order to fully function as a camera, the llt and 7m parts are also necessary in the wooden embodiment. Needless to say, it has

The shirt release button 72 operates in two strokes. First, when the first step is pressed, the overall control section 58 activates the AEM1gi section 6G in response to this, performs TTL photometry by the photodetection element 38, color temperature detection by the color temperature detection section 78, and aperture drive section. The AE control section 66 controls the aperture 14 by the shutter drive section 28 and the shutter 18 by the shutter drive section 40, that is, as described above.
The amount of light incident from the subject through the lens 12 is measured by the photodetecting element 36, and the photometric value is sent to the overall control unit 5.
Output to 8. Further, the color temperature detection unit 78 detects the color temperature of the incident light that enters through the aperture 80 and outputs the detected value to the overall control unit 58. As described above, the overall control unit 58 stores 81113 in accordance with the light amount signal from the AE control FBH and the color temperature signal from the color temperature detection unit 78.
According to the lookup table data read from 0,
the extent of the aperture of the aperture 14, or the aperture width, the opening time or exposure time of the shutter 18, and the variable gain amplifier 12;
Determine the gains of 4R1124G and 124B.

When the shirt release button 72 is pressed to the second stage, in response, the overall control section 58 controls the aperture drive section 28 and shutter drive section 401, respectively, according to the determined aperture and exposure conditions, and Imaging device 22
In the solid-state imaging device 22 that performs photography, charges corresponding to the subject image exposed to the imaging cell array 24 by opening the shutter 18 are accumulated, and in response to the drive clock from the drive input 44, charges are accumulated in the solid-state imaging device 22. A color video signal is output at output 48.

The color video signal read out from the solid-state imaging device 22 is amplified by the color separation gain adjustment section 50, and is
It is decomposed into At this time, the overall control section 58 sends the color separation gain adjustment section 50 according to the color temperature data obtained from the color temperature detection section 78 and the photometric value obtained from the photodetection element 3B.
Signal 5 that adjusts the gain of each color independently for each of the three colors.
BR, 56G, and 56B are output. As a result, the output 54 of the color separation gain adjustment section 50 outputs the three previous symbols RGB whose own balance has been adjusted.

The three color signals RGB outputted from the color separation gain adjustment section 50 are input to a matrix circuit 60, and the circuit 60 generates a luminance signal Y according to a predetermined composition rule. Matrix circuit 6
0 also forms the color difference signals R-Y and B-Y, outputs the luminance signal Y at output 62, and outputs the color difference signal R-Y
and B-Y are output to output 62 in scan line sequential order.

As described above, in this embodiment, the aperture of the diaphragm 14 is determined based on the lookup table data according to the amount of incident light detected by the photodetector 36 and the color temperature of the incident light detected by the color temperature detection section 78. degree, the opening time of the shutter 18, and the variable gain amplifier 124R1124G,
124B gain is determined, thereby obtaining a constant output and adjusting the white balance.

Therefore, it is possible to compensate for the difference in sensitivity between the solid-state imaging device 22 and the photodetecting element 36 due to color temperature, and to obtain a constant G signal output or Y signal output from the solid-state imaging device 22 regardless of changes in color temperature. At the same time,
Accurately adjust the white balance according to the exposure amount and color temperature of the incident light, which are adjusted to keep the G signal output or Y signal output constant. J can be adjusted.

Furthermore, the exposure amount of the incident light is controlled to adjust the peak edge of the G signal or the Y signal and the white balance, and the gain of the variable gain amplifiers 124R, 124G, and 124B is as follows:
The A adjustment is performed by independently controlling the aperture 14, shutter 18, and variable gain amplifiers 124R, 124G, and 124B using a lookup table 132 that includes four of them. Therefore, if one of the G signal or Y signal output and self-balance adjustment is adjusted and then the other is adjusted, no error will appear in the 3Jffi-completed signal.

Therefore, even if there is a difference in the amount of light or color temperature that enters the imaging device 22 through the imaging lens 12 from the subject,
The level of the G signal of the video signal output from the solid-state imaging device 22 or the luminance signal Y synthesized from the video signal can be adjusted to one level, and the white balance can be adjusted appropriately, and a good image can be produced from the output 62. A video signal representing the image can be obtained.

Effect As described above, in the present invention, the color temperature between the image sensor and the photometric element is adjusted so that the brightness signal synthesized from the G signal or output signal of the solid-state image sensor signal according to a predetermined synthesis rule is constant. Differences in sensitivity of color signals due to color temperature are compensated for and self-balance is adjusted.

Therefore, even if there is a change in the color temperature of light incident on the solid-state imaging device/chair from the subject, the level and white balance of the video signal output from the solid-state imaging device can be adjusted appropriately.

Therefore, a video signal representing a good image can be obtained, and exposure errors and white balance errors that occur in conventional electronic still cameras are minimized.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing an embodiment of the output control device of an electronic still camera according to the present invention, FIG. Em2 is a functional block diagram showing the color separation error gain adjustment section of FIG. 1, and FIG. FIG. 4 is a block diagram showing an example of the color temperature detection section shown in FIG. 1. FIG. 4 is a graph showing the output characteristics of the color temperature detection section shown in FIG. 3. FIGS. 3 is a graph showing a change in sensitivity depending on the color temperature of a CCrJ sensor when the output of is one foot. Explanation of the main parts in issue 14...Aperture 18,...Shutter 22,...Solid-state imaging device 28,...Aperture drive section 38,...Photodetector element 40,...Shutter drive section 42,... Logarithmic kg! @ Device 58, ..., Overall control section eo, ..., Matrix circuit 8B, ..., AE control section 78, ..., Color temperature detection section 90.92, Logarithmic amplifier 94, ..., Differential #! J width unit 130, , Storage unit Patent applicant Fuji Photo Film Co., Ltd. Agent Takao Katori Takao Maruyama! ('!cICD, ゞゞ迿〇---
〇 〇 〇 〇compromise'':, Buttoya truth NOQ:! ψ Bas ~ 〇−
--〇 〇 〇 〇October 17, 1986

Claims (1)

[Claims] 1. In an output control device for controlling the output signal level and white balance of an electronic still camera that images a subject using a solid-state imaging device and forms a color video signal representing an image of the subject. , the apparatus comprises: an exposure control means for controlling the exposure amount of the electronic still camera; amplifying each separated color signal of the color video signal;
variable amplification means whose amplification gain can be adjusted for each of the separated color signals; a light detection means that receives incident light from the object field and outputs a first signal according to the amount of the incident light; a color temperature detection means for measuring a color temperature of a subject and outputting a second signal according to the color temperature;
control means for controlling the exposure control means and the variable amplification means according to a signal from the light detection means, and the control means controls the sensitivity of the solid-state imaging device to the light detection means depending on the amount of incident light and the color temperature of the solid-state imaging device. An output control device for an electronic still camera, characterized in that the output of the electronic still camera is kept constant and the white balance is adjusted so as to compensate for differences and changes in white balance. 2. The device according to claim 1, wherein the control means, in response to the first and second signals,
An output control device characterized by controlling the output level of the G signal among the separated color signals to be constant. 3. The apparatus according to claim 1, wherein the electronic still camera includes matrix circuit means for forming a luminance signal from the color video signal according to a predetermined synthesis rule, and the control means is configured to control the first and in response to the second signal,
An output control device characterized in that the output control device performs control so that the luminance signal output from the matrix circuit is constant. 4. The device according to any one of claims 1 to 3, wherein the control means corrects the first signal using the second signal, and the corrected first signal An output control device characterized in that the exposure control means and the variable amplification means are controlled by the corrected first signal and the second signal. 5. An output control device according to any one of claims 1 to 4, wherein the exposure control means controls an aperture and a shutter of the electronic still camera. 6. In the apparatus according to claim 5, the control means controls each of the aperture amount of the aperture, the exposure time of the shutter, and the color video signal using the values of the first and second signals as parameters. comprising a storage means storing table data for deriving the respective gains to be adjusted of the variable amplification means for the separated color signals, and referring to the table data according to the first and second signals, An output control device that controls the aperture, shutter, and variable amplification means.