JPH06205429A - Video camera equipment - Google Patents

Abstract

PURPOSE:To improve the picture quality and the S/N in the video camera equipment. CONSTITUTION:The camera equipment is provided with an image pickup element 2 applying photoelectric conversion to an optical image obtained through a lens system L, an AGC circuit 22 amplifying an output of the image pickup element and controlled externally, an A/D converter circuit 3 A/D-converting an AGC output, a luminance signal processing circuit 4 and a chrominance signal processing circuit 5 separating and generating a luminance signal and a chrominance signal respectively from an output of the A/D converter circuit and a control means 8 or the like applying a gain control signal to the AGC circuit and changing stepwise a base clip amount of the chrominance signal in the chrominance signal processing circuit, a frequency boost level and a coring amount for contour correction of the luminance signal in the luminance signal processing circuit in both horizontal and vertical directions corresponding to the gain control operation. Then the S/N in the visual sense is improved by increasing the coring amount or the like and decreasing the enhancer frequency boost level when the gain of the AGC is increased to improve the sensitivity under a low illuminance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera device such as a color video movie, and more particularly, by digitizing most of the signal processing circuit of the camera section, the number of parts is reduced, the adjustment process is reduced, and stability is improved. The present invention relates to a video camera device that is improved, has high image quality, and has multiple functions.

[0002]

2. Description of the Related Art The configuration and operation of a conventional signal processing circuit of a camera unit in a camera-integrated recording / reproducing apparatus for a video movie or the like will be described with reference to the circuit block diagram of FIG. Imaging light from a subject (not shown) is supplied to a solid-state imaging device (hereinafter also referred to as “CCD”) 2 via a lens (optical) system including a plurality of lenses, where it is photoelectrically converted and intermittently. It is extracted as an electric signal and is output as a correlated double sampling circuit in the next stage.
ing; hereinafter referred to as "CDS" 21 is converted into a continuous video signal, and an automatic gain control circuit (hereinafter referred to as "AGC circuit")
Is supplied to a gain control amplifier (hereinafter also referred to as “GCA”) 23, which is appropriately amplified or attenuated, and then supplied to a luminance signal processing circuit 4 and a color (chroma) signal processing circuit 5. To be done.

In addition to the GCA 23, the AGC circuit 22 includes an operational amplifier (operational amplifier) 24, a resistor R, a capacitor C,
Equipped with constant voltage power supply (for setting reference level) E, G
The video signal from the CDS 21 is detected by detecting the output level of the CA 23 and supplying a signal according to the difference from the reference level E by the operational amplifier 24 to the GCA 23 as a gain control signal (hereinafter referred to as “CTL signal” etc.). Is automatically controlled to an appropriate level. The output signal of the operational amplifier 24 is
It is also supplied to a luminance signal processing circuit 4 and a color signal processing circuit 5 for separating and outputting a Y (luminance) signal and a C (color) signal from the AGC output, respectively. This is a contour included in the luminance signal processing circuit 4 or the like. This is to control the degree of coring processing, which will be described later, on the color signal and the base clip amount for the luminance signal in the compensation circuit (enhancer; not shown). Note that in FIG. 6, the luminance signal processing circuit 4 and the color signal processing circuit 5 are drawn without being separated for convenience, but this suggests that the output of the operational amplifier 24 is also supplied to the luminance signal processing circuit 4. There is.

As is well known, in order to increase the apparent sharpness of an image, a signal obtained by differentiating an original chroma (color) signal is superimposed on an original chroma signal delayed by a predetermined time, so that an aperture correction (contour Is emphasized). When such contour compensation is performed, noise is also increased (noise is also emphasized and the level increases). Therefore, a small contour signal is regarded as a noise component, and a contour signal below a predetermined level is suppressed. This is called coring processing. It should be noted that a unipolar luminance signal is referred to as a "base clip", but since there is almost no difference in operation principle, it will be described in the present specification without being strictly used properly. As is well known, the video signal for magnetic recording is
Since γ (gamma) correction has been performed, contour compensation makes the SN ratio deteriorate in dark areas and makes it difficult to contour in bright areas. Therefore, in order to perform good contour compensation, the inverse γ
It is also practiced to make a compensation signal by applying a correction.

[0005]

In the above conventional video camera apparatus, the CTL signal from the operational amplifier 24 of the AGC circuit 22 shown in FIG. 6 changes the coring amount of the color (chroma) signal system to change the AGC. The larger the gain in the circuit 22, the larger the amount of coring, and the visual S / N was improved.

In the conventional method, the coring amount of the coring circuit (not shown) included in the luminance signal processing circuit 4 is made variable according to the level characteristic curve of the CTL signal from the AGC circuit 22. To exactly match the CTL (control characteristic) curves of the circuit 22 and the coring circuit,
It is difficult to consider variations in circuit characteristics. Also,
It has been more difficult to control the boost level of the enhancer (contour compensation) in the luminance signal, the amount of coring, etc. in conjunction with the automatic gain control.

[0007]

SUMMARY OF THE INVENTION A video camera device of the present invention comprises an image pickup device for photoelectrically converting an optical image obtained through a lens system, and an externally controllable automatic image pickup device for amplifying an electric signal from the image pickup device. A gain control circuit; an A / D conversion circuit for converting an analog signal from this circuit into a digital signal; a brightness signal processing circuit for separating and generating a brightness signal and a color signal from the output of the A / D conversion circuit; In a video camera device provided with a color signal processing circuit, a control signal is supplied to an automatic gain control circuit, and a coring amount of a color signal in the color signal processing circuit and a brightness processing circuit are provided in correspondence with the gain control operation. The above problem is solved by further providing control means for stepwise changing a frequency boost level and a coring amount for horizontal and vertical contour correction of a luminance signal. A.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the video camera device of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block configuration diagram of a main part of a video camera device 1 of the present invention. In this figure, the same components as those of the conventional device shown in FIG. 6 are designated by the same reference numerals. The output signal from the luminance signal processing circuit 4 is used not only for color signal processing but also for autofocusing as is well known, but the configuration of the autofocusing circuit etc. is outside the scope of the present invention. Illustration and description are omitted.

In FIG. 1, the optical image from the lens system L is incident on the CCD 2 and photoelectrically converted. A complementary color filter is provided on the front side of the CCD 2 to output a signal in which the modulated color signal is multiplexed with the luminance signal, and the CDS 21 in the next stage extracts the intermittent signal as a continuous signal. . After that, the signal passed through the AGC circuit 22 is converted into a digital signal by the A / D conversion circuit 3.

The luminance signal processing circuit 4 carries out a predetermined signal processing described later, and the signal branched therefrom is subjected to a predetermined signal processing described later in the color signal processing circuit 5. The processed signal and the signal from the luminance signal processing circuit 4 are both supplied to the encoder processing circuit 6, where they are subjected to encoder processing such as synchronization described later. The output of the encoder processing circuit 6 is D /
It is converted back to an analog signal by the A conversion circuit 7. Further, each data in the luminance signal processing circuit 4, the color signal processing circuit 5 and the encoder processing circuit 6 is supplied to a microprocessor (hereinafter also referred to as “CPU”) 8 via a data bus 9, and these data are supplied. Is arithmetically processed by the CPU 8 to control each of the above circuits.

A more specific structure of each circuit will be described in detail below with reference to FIG. First, Fig. 2 (A)
FIG. 4 is a specific block diagram of the luminance signal processing circuit 4.
In such a configuration, the output signal from the A / D conversion circuit 3 is supplied from the input terminal In ₁ to the OB clamp circuit 41, where the pedestal portion thereof is clamped to the optical black (OB) level. The clamped digital signal is supplied to the color signal processing circuit 5 and the flicker correction circuit 42, and when the signal contains a flicker component such as a fluorescent light,
This is removed by the flicker correction circuit 42. The flare correction circuit 43 performs flare correction to bring the pedestal level into an appropriate state.

The output signal of the flare correction circuit 43 is gain-controlled by a GCA (gain control amplifier) 44,
The (gamma) correction circuit 45 performs gamma correction. Further, the output of the γ correction circuit 45 is a trap filter (TRAP Fi
lter) 46 to remove the color components, and then the contour correction circuit 47 performs contour correction (compensation for deterioration of high frequency components), and then the encoder processing circuit 6. As shown in the figure, the contour correction circuit 47 is composed of an aperture correction circuit 47a, a coring circuit 47b, and an adder 47c. A specific circuit configuration is shown in FIG. 2B, and its operation will be described with reference to the signal waveform diagram of FIG.

The aperture correction circuit 47a constituting the contour correction circuit 47 has two delay circuits 48a, 48 having a delay time τ.
b, an adder 47d, a subtractor 47e, and an attenuator (variable resistor) VR ₁ are connected and connected as shown in the figure. Since the attenuator VR ₁ is set to halve the level of the input signal, the output of the trap filter 46 (see FIG. 10).
(A) is represented by f (t), the outputs of the delay circuits 48a, 48b and the adder 47d are f (t-τ), f (t-2τ), f, respectively.
(t) + f (t-2τ), and therefore the coring circuit 47b receives an aperture-corrected signal {f (t-τ)-{f (t) + f (t-2τ)} / 2 { FIG. 10B) is output.

When such aperture correction is performed, FIG.
Since the noise level also increases as shown in (B), the small contour signal is regarded as a noise component, and the signal component below a predetermined level is suppressed by the coring circuit 47b, and the noise is reduced as shown in FIG. 10 (C). A contour correction signal with almost no noise is obtained. afterwards,
The level is adjusted by an attenuator (variable resistor) VR ₂ as appropriate, and is added to the output signal from the delay circuit 48a by the adder 47d to perform contour correction in which noise is inconspicuous.

Here, the delay time τ of the delay circuits 48a and 48b
Is a minute time in consideration of the horizontal frequency, the contour correction is in the horizontal direction, and 1H (1 horizontal scanning period) is the contour correction in the vertical direction. Therefore, if the two types of contour correction circuits 47 with the delay time τ set to these two types are provided, the calculation processing of the contour correction in both the horizontal and vertical directions can be individually performed.

The arithmetic processing method will be described with reference to FIGS. 3 (A) and 3 (B). FIG. 3A is a schematic diagram of pixel data for explaining the method of obtaining the aperture amount in the horizontal direction. In the figure, for columns A _{1 to} A ₃ , A = {A ₂ + ( A ₁ + A ₃ ) / 2} / 2 ………………
...... Performs filtering. The same operation is performed on B _{1 to} B _{3 and} C _{1 to} C ₃ , and D and E are left as they are and A
Obtain data for ~ E. These A to E5 data are multiplied by the horizontal aperture controller coefficients K _1, K _{2 and} K ₃ to obtain the horizontal aperture controller amount represented by the following equation.

AP _h = (D + E) K ₁ + (A + C) K ₂ + B · K ₃ ... Similarly, FIG. 3 (B) is a schematic diagram of pixel data for explaining a method of obtaining the amount of aperture companion in the vertical direction. In the figure, for the rows of A _1, B _1, C ₁ , F = {B ₁ + (A ₁ + C ₁ ) / 2} / 2 ………………
...... is filtered, A _2, B _2, C ₂ columns, A _3, B _3,
It is calculated similarly for C ₃ column, to obtain three data F to H. This data is multiplied by vertical aperture controller coefficients K _{4 and} K ₅ to obtain the vertical aperture capacitor amount represented by the following equation.

AP _v = (F + H) K ₄ + G · K ₅ ………………
…… For these values of AP _{h and} AP _v obtained by the equation,
If necessary, individual coring is performed, and then both values are calculated to obtain the amount of aperture control. At this time, the above formula is used for filtering, and specific values of the coefficients K _{1 to} K ₅ are −0.5, −1, 3, 1, 2, etc., respectively.

Next, a specific configuration of the color signal processing circuit 5 will be described with reference to the block diagram of FIG. The signal from the OB clamp circuit 41 shown in FIG.
₂ to the latch circuits 52 and 53, where they are alternately latched by the timings of the sampling pulses SP ₁ and SP ₂ that are ½ of the pixel repetition frequency and 180 ° out of phase with each other, and then are fed to the LPF 54 and LPF 55. Each is supplied.

Both output signals from the LPFs 54 and 55 are combined by an adder 56a in the color separation circuit 56 and taken out as a narrow band luminance signal (YL). This narrow band luminance signal is supplied to the γ (gamma) correction circuit 58 at the next stage and the automatic signal processing circuit 10 provided in the color signal processing circuit 5. Further, the output of the LPF 55 is multiplied by a predetermined number supplied via the data bus 9 in the multiplication circuit 56b, and the subtraction circuit 56b.
The output of the LPF 54 and the output of the multiplication circuit 56b are subtracted by the subtraction circuit 56c, and the line sequential signals of the R signal and the B signal are taken out. These R and B signals are supplied to the white balance circuit (WB) 57 at the next stage and the auto signal processing circuit 10.

The white balance adjusted R and B signals are supplied to a γ correction circuit 58, where they are gamma-corrected together with the narrow band luminance signal, and then supplied to a mixing circuit 59 in the next stage. The narrow band luminance signal output from the γ correction circuit 58 is also supplied to the auto signal processing circuit 10. In the mixing circuit 59, the narrow band luminance signal is subtracted from the incoming R and B signals to obtain the RY and B signals.
A line-sequential color difference signal of the -Y signal is generated. The color difference signal gain-controlled by the chroma gain circuit 60 at the next stage is supplied to the automatic signal processing circuit 10 and the interpolation / color signal noise elimination circuit (simultaneous circuit) 61. Here, the color signal noise removal circuit unit is operated in the case of noise removal that emphasizes S / N, and the interpolation circuit unit is operated in the case of emphasis on vertical resolution, thereby reducing noise. Along with
The color difference signals (RY, BY) are synchronized (timing matched).

FIG. 5 is a block diagram showing a more specific configuration of the interpolation / color signal noise elimination circuit (synchronization circuit) 61. If S / N is important, a switch (not shown) is connected to, for example, the H side so that the input terminal In ₄
Switch higher level control pulse (CTL1)
It is supplied to SW1, SW2, and SW3, and each contact piece is connected to the H terminal side as shown in the figure to form a color signal noise elimination circuit. The incoming line-sequential color difference signals (RY, BY) are added by the adder 61a,
1H delay circuit (1HDLY1) 61b and 1H delay circuit (1H
DLY2) 61c is sequentially supplied to the subtracter 61d, is subtracted from the input signal (RY, BY) from the input terminal In ₃ , and is supplied to the mute circuit (MUTE) 61e. At this time, both input signals to the subtractor 61d become signals of the same color line.

The mute circuit 61e extracts a small-amplitude noise component and supplies it to the adder 61a, whereby the noise component in the color signal is removed. That is, the adder 61
The cyclic color signal noise elimination circuit section is formed by the configurations from a to the mute circuit 61e and the switch SW3. The output of the adder 61a and the output of the 1H delay circuit 61b are switched for each line by the switching signal (HG), and the simultaneous color difference signals (RY and B- are output by the switches SW4 and SW5, respectively).
Y) is output in a time division manner.

On the other hand, when importance is attached to the resolution in the vertical direction, the switch is connected to the L side. As a result, the L level control pulse (CTL1) switches SW1, SW2, SW3.
Is supplied to each terminal to connect it to the L side to activate the interpolation circuit section. In this case, the input color difference signals (RY, B-
Y) is an adder through the 1H delay circuits 61b and 61c sequentially
61a. The output of this adder is halved in gain by the 1/2 attenuator 61f and supplied to the switches SW4 and SW5. In this case, the current input color difference signal and the 1H delay circuits 61b and 61c
And a 2H delay signal that has been sequentially transmitted are added to form a comb-type noise reduction circuit.

From the switches SW4 and SW5, as in the case of the color signal noise elimination circuit section, the synchronized color difference signals (R-
Y, B-Y) is output. Then, this color difference signal (R
-Y, BY) are respectively supplied to the color difference matrix circuit 62 of FIG. 4, where the matrix processing by the following calculation is performed, and then the color difference circuit 63 is supplied.

RY = (ry) + K ₁ × (by) BY = (by) + K ₂ × (ry) where -1 <K ₁ <1, -1 < K ₂ <1 On the other hand, the clamp circuit output from the input terminal In ₂ is also supplied to a slice circuit (SLICE) 64, where a predetermined level or more is sliced and supplied to the achromatic circuit 63. This suppresses the high-brightness image signal and the color difference signal in the peripheral portion thereof and prevents the generation of false color signals. Further, the output of the achromatic circuit 63 is supplied to the base clip circuit 65,
Clip the achromatic part of the image signal. Therefore, when the subject is in a low illuminance state, deterioration of the S / N of the image signal can be prevented even if the gain of signal amplification is increased. The output signal of the base clip circuit 65 is supplied to the encoder processing circuit 6.

The encoder processing circuit 6 has a built-in modulation circuit. In this modulation circuit, the RY and BY color difference signals are balanced-modulated and a burst signal is added. Has a carrier frequency of 3.58 MHz F
It is an M-modulated color signal. Then, the modulated color signal is converted back into an analog signal by the D / A conversion circuit 7, and is supplied to a signal processing circuit (recording amplifier for magnetic recording, etc .; not shown) in the subsequent stage together with the luminance signal. It

A ROM (not shown) is provided at the connection point of the data bus 9 to each circuit.
A fixed value (default value) is set in advance in M.
For example, when the power is turned on (closed), it takes time for each circuit to rise, which may cause a missed image capture scene. In such a case, if the standard value is set in advance in the ROM of each circuit so that each circuit can operate quickly and in a normal state, the above-mentioned drawback can be prevented. Therefore, a switch (not shown) is provided and this is turned on.
By setting the state, the connection between each circuit and the data bus 9 is cut off, and by directly connecting each ROM, the standard operating state set in advance is established. Further, these set values are also used when searching for a faulty part of the CPU or the like by checking with the set values when the operating state of the device is bad.

Next, the operation of the automatic gain control and the coring (base clip) in the device of the present invention will be described with reference to FIG. 1, FIG. 2, FIG. 4 and FIG. FIG. 7 shows the AGC circuit 2 for the luminance signal level (Y level).
2 gain and coring circuit 47b in the contour correction circuit 47
6 is a control characteristic diagram of the amount of coring in FIG. Depending on the Y level of the output of the trap filter 46, the value of 16 steps of hexadecimal (hexadecimal system) instruction is stepwise changed to C as shown in the figure.
The GCA gain and the amount of coring (base clip) are controlled by designating from PU8.

As is clear from FIG. 7, the Y level is
If 60 _H (H indicates that 60 etc. is hexadecimal), coring is not performed and the GCA gain is 0 dB.
When the level is 20 _H or less, the GCA gain is 20 dB,
Coring is a constant value of 10 _H (13%). Thus, coring characteristics, as shown in FIG. 8, an increase in input level, between F0 _H to 10 _H is the output level becomes zero. The coring amount is calculated with 7F _H being 100% as shown in FIG. 8 (in the case of the base clip, the characteristic of only the upper right portion of FIG. 8).

As a concrete operation, first, from the auto signal processing circuit 10 (see FIG. 4) in the color signal processing circuit 5,
The screen division data of the level of the narrow band luminance signal Y _L and the average value (one screen integrated value) are supplied to the CPU 8. At this time, Y
_When it is determined that the _L level (same as the luminance signal level) is lower than the predetermined level, the gain CTL (gain control) signal (eg, DC voltage value) is supplied to the AGC circuit 22 according to the CTL curve of FIG. _The gain is changed so that the _L level is kept constant. In accordance with this operation, the contour correction circuit 47
The data bus to the internal coring circuit 47b (and the base clip amount of the base clip circuit 65 in the color signal processing circuit 5) is controlled to prevent the deterioration of image quality when the gain is increased.

Here, an example of the amplitude characteristic of the horizontal aperture compensation (horizontal contour correction) in the aperture correction circuit 47a is shown in FIG. In this figure, the sampling clock frequency for sampling is set to 14.3 MHz (= 4f _sc ) of the NTSC system.
In addition, frequency boost is performed around 3.5MHz, 7.16MH
A trap is inserted at z (by trap filter 46). As shown in the figure, the boost level is about 16 dB when the gain of the AGC circuit 22 is minimum and about 10 dB when it is maximum, and the difference 6
It is in dB.

As a concrete realization method thereof, the above-mentioned,
When the values of the coefficients K _{1 to} K _{5 in} the equation are Gain min (minimum gain), for example, K ₁ = -0.5, K ₂ = -1, K ₃ =, respectively.
3, K ₄ = -0.5, K ₅ = 1 and Gain max (maximum gain)
At times, K ₁ = -0.25, K ₂ = -0.5, K ₃ = 1.5, K _{4 respectively.}
= −0.25, K ₅ = 0.5, the boost amount is 6 dB as shown in FIG. Between this minimum gain and maximum gain,
Corresponding to the gain control signal, each coefficient is designated step by step from the CPU 8 to the luminance signal processing circuit 4 and controlled. Further, the contour correction characteristic in the vertical direction also has a curve substantially similar to that in FIG.

In the example of FIGS. 7 and 8, the gain is 0 dB to 20 dB.
The amount of coring (base clip) is controlled from 0% to 13% accordingly. Further, the enhancer (contour correction) is, as shown in FIG.
It is changing by 6 dB. By increasing the coring amount and decreasing the enhancer frequency boost level in this way, visual S / N improvement can be realized, and by gradually controlling the gain control, a natural image quality can be achieved. It has the excellent feature that changes can be made smoothly.

[0035]

Since the video camera device of the present invention is constructed as described above, the AGC is used for increasing the sensitivity under low illuminance.
When the gain of the circuit 22 is increased, the coring amount is increased and the enhancer frequency boost level is decreased, so that the S / N can be visually improved. Further, the image quality can be changed naturally and smoothly by performing the stepwise control corresponding to the gain control. Furthermore, the matching of the control curves of each control, which is a problem of the analog control {accurately matching the control characteristic curve of the automatic gain control and the base clip}, is also C
By controlling the data bus in the PU, it has an excellent effect that it can be easily realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a video camera device of the present invention.

FIG. 2A is a block diagram of a luminance signal processing circuit which constitutes the device of the present invention. (B) is a block diagram of a contour correction circuit that constitutes a luminance signal processing circuit.

FIG. 3A is a schematic diagram of pixel data for explaining a method of obtaining an aperture amount in the horizontal direction. (B) is a schematic diagram of pixel data for explaining a method of obtaining an aperture amount in the vertical direction.

FIG. 4 is a block diagram of a color signal processing circuit which constitutes the device of the present invention.

FIG. 5 is a block diagram of an interpolation / color signal noise removal circuit (synchronization circuit).

FIG. 6 is a block diagram showing a typical example of a conventional video camera device.

FIG. 7 is a control characteristic diagram of the gain and the amount of coring (base clip) of the gain control amplifier with respect to the luminance signal level in the device of the present invention.

FIG. 8 is a characteristic diagram of a core ring (base clip) in the device of the present invention.

FIG. 9 is a characteristic diagram of the horizontal aperture converter in the device of the present invention.

FIG. 10 is a signal waveform diagram for explaining the operation of the contour correction circuit.

[Explanation of symbols]

1 ... Video camera device, 2 ... CCD, 3 ... A / D conversion circuit, 4 ... Luminance signal processing circuit, 5 ... Color signal processing circuit, 6 ...
Encoder processing circuit, 7 ... D / A conversion circuit, 8 ... CP
U, 9 ... Data bus, 10 ... Auto signal processing circuit, 22
... Automatic gain control (AGC) circuit, 23 ... GCA, 41 ...
OB clamp circuit, 45, 58 ... γ correction circuit, 46 ... Trap filter, 47 ... Contour correction circuit, 47a ... Aperture correction circuit, 47b ... Coring circuit, 47c, 47d ... Adder, 47e ... Subtractor, 48a, 48b … Delay circuit, 65… Base clip circuit, L… Lens system, VR _1, VR ₂ … Attenuator.

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[Procedure amendment]

[Submission date] December 24, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 10]

[Figure 3]

[Figure 5]

[Figure 6]

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[Figure 4]

[Figure 8]

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Claims (1)

[Claims] 1. An image pickup device for photoelectrically converting an optical image obtained through a lens system, an externally controllable automatic gain control circuit for amplifying an electric signal from the image pickup device, and an automatic gain control circuit for amplifying an electric signal from the image pickup device. A to convert analog signals to digital signals
A video camera device including an A / D conversion circuit, and a luminance signal processing circuit and a color signal processing circuit that separate and generate a luminance signal and a color signal from the output of the A / D conversion circuit, wherein the automatic gain control circuit And a frequency of contour correction in the horizontal and / or vertical direction of the luminance signal in the luminance processing circuit and a coring amount of the color signal in the color signal processing circuit, in response to the gain control operation. A video camera device provided with a control means for gradually changing the boost level and the amount of coring.