JP2000115584A - Horizontal contour correcting circuit and camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horizontal contour correcting circuit capable of providing the video of high sharpness and high picture quality by performing suitable horizontal contour correction while preventing the reduction of picture quality. SOLUTION: In this circuit 100, the horizontal frequency of a main luminance signal line is adjusted by a first low-pass filter(LPF) 110, and a luminance signal for horizontal contour correction is generated by different third and fourth LPF 116 and 118. Corresponding to this luminance signal generated by the third and fourth LPF 116 and 118, the signal of a band with 1/2 and 1/4 sampling frequency fs as a peak frequency is extracted as a horizontal contour correct signal by first and second high-pass filters(HPF) 124 and 128, and this signal is adjusted into prescribed gain respectively by second and third multipliers 126 and 130 and added to the luminance signal by third and fourth adders 132 and 134.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a single plate CC
A horizontal contour correction circuit suitable for application to a D-camera or the like, which prevents deterioration of image quality at the time of horizontal contour correction and obtains a high-definition and high-quality video signal, and a horizontal contour correction circuit as described above. The present invention relates to a camera system that can obtain a high-quality video signal.

[0002]

2. Description of the Related Art CCD (C)
The high resolution, high sensitivity, and miniaturization of the harge coupled device have been remarkable, and in recent years, even a camera system for a broadcasting station or business use a CCD camera. Such CCD color camera imaging methods include a single-panel type in which color information is obtained from one CCD, and a CCD type.
It can be divided into a multi-panel type such as a three-panel type obtained with three CDs, but since a high-resolution color image can be obtained relatively easily, a single-panel camera is widely used mainly for home video cameras and the like. Have been.

In this single-chip color camera, it is necessary to attach a color filter to each pixel of the CCD in order to give color information to a signal output from one CCD image pickup device. Various color filter arrangement methods have been developed and put into practical use.
e), cyan (Cy), magenta (Mg), and green (G) complementary color filters, as shown in FIG.
A complementary color mosaic arrangement in which two horizontal pixels and four vertical pixels are repeatedly arranged is widely used. Also, in general, CCD
In a camera, an outline correction process is often performed in order to obtain a higher quality image. This is a process for obtaining an image with high definition by emphasizing and clarifying the outline of the subject.

FIG. 4 shows the configuration of a conventional circuit for performing contour correction in the horizontal and vertical directions in a CCD camera. In the contour correction circuit 900, the input video signal S ₀ is delayed by one scanning line in each of the first delay circuit 902 and the second delay circuit 904.
The signal S ₂ delayed by two scanning lines is added to the first adder 906
Is added to the original input video signal S ₀ . The added signal is halved by a divider 907, and a subtractor 9
Is subtracted the signal S ₁ one scanning line delay in 08, the contour signal in the vertical direction is calculated. Then, this contour signal is passed through the second LPF 912 to the first multiplier 9.
At 14, a predetermined coefficient α is multiplied and applied to the fourth adder 934 as a vertical contour correction signal to be added to the luminance signal.

[0005] The signal S ₁ generated in the first delay circuit 902 is output to the fourth adder 134 as a luminance signal main line signal via the first LPF 910. Note that the first LPF 910 is a filter composed of four or more taps based on 1 + Z ⁻¹ in order to suppress a decrease in horizontal frequency characteristics.

From the output signal of the first LPF 910, a signal of a predetermined band having a peak at f _s / 2 is extracted from the first BPF 924, and the second multiplier 92
In step 6, a predetermined gain β is multiplied to generate a horizontal contour correction signal having a peak at f _S / 2. Similarly, the first
From the output signal of the LPF 910, a signal of a predetermined band having a peak at f _s / 4 is extracted in the second HPF 928, multiplied by a predetermined gain θ in the third multiplier 930, and peaked at f _s / 4. Is generated.

[0007] f generated by these second multipliers 926
_A third adder 932 adds the horizontal contour correction signal having a peak at _S / 2 and the horizontal contour correction signal having a peak at f _S / 4 generated by the third multiplier 930, and corrects the horizontal contour. The signal is output to the fourth adder 934 as a signal. Then, in the fourth adder 934, the vertical contour correction signal and the horizontal contour correction signal are added to the luminance signal main line, and the sum is output as a luminance signal subjected to contour correction.

[0008]

However, in the above-described contour correction circuit, if a large gain is given to the horizontal contour correction signal of f _s / 2 in order to increase the sharpness in the horizontal direction, the horizontal 2 × Under the influence of the vertical four repetition color coding, the level of the luminance signal in the horizontal direction is also gained up at the same time, and there is a problem that the image quality is degraded due to the increase of the luminance signal in the horizontal direction. That is, in the 2 × 4 arrangement of the complementary color mosaic filters as shown in FIG. 3, since the horizontal f _s / 2 has a signal difference due to the difference in sensitivity of the color filters, the first LPF 910 has a higher order. When a filter is used, the transient characteristics of the filter deteriorate and the image quality deteriorates. In addition, since the input signal of the system for obtaining the horizontal contour correction signal is not subjected to the filtering process in the vertical direction, a level difference occurs between the horizontal contour correction signals between the lines near the horizontal edge as shown in FIG. Due to the influence, a cross color which is a flicker from a luminance signal to a color signal is generated in addition to an edge, and there is a problem that image quality is deteriorated.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a horizontal contour correction circuit capable of appropriately performing horizontal contour correction while preventing deterioration in image quality, thereby obtaining a high-definition and high-quality image. Another object of the present invention is to provide a camera system capable of capturing a clear and high-quality image by using such a horizontal contour correction circuit.

[0010]

SUMMARY OF THE INVENTION Accordingly, a horizontal contour correction circuit according to the present invention includes a pixel read out in a field accumulation mode from an image pickup means having an image pickup element for each of a plurality of pixels arranged in a predetermined color coding. A circuit for performing horizontal contour correction on a luminance signal generated based on data, wherein the horizontal frequency of the generated luminance signal is limited to a predetermined range, and the restricted luminance signal of the horizontal frequency is obtained. A first filter circuit having a predetermined order to be output, and a second filter having a lower order than the first filter circuit for generating a luminance signal for a horizontal contour correction signal based on the generated luminance signal. Circuit for extracting a signal in a frequency band having a predetermined peak frequency as a horizontal contour correction signal from a luminance signal generated by the second filter circuit. It has a signal extraction means, and an adding circuit for adding the horizontal contour correction signal the extracted luminance signal output from the first filter circuit.

In the horizontal contour correction circuit having such a configuration, the horizontal frequency of the luminance signal input by the first filter circuit of a predetermined order is limited to a predetermined range.
A luminance signal for a horizontal contour correction signal is generated in advance by a second filter circuit that has a lower order than that of the first filter circuit. Then, from the luminance signal generated by the second filter circuit, the horizontal contour correction signal extracting means extracts a signal in a frequency band having a predetermined peak frequency as a horizontal contour correction signal, and In the addition circuit, by adding to the luminance signal output from the first filter circuit,
A luminance signal subjected to horizontal contour correction is obtained.

Further, the camera system of the present invention has an image pickup device for each of a plurality of pixels arranged in a predetermined color coding, and an image pickup means for outputting the pixel data in a field accumulation mode; A camera system comprising: first signal processing means for generating a luminance signal and a color signal based on data; and contour correction means for performing at least horizontal contour correction on the generated luminance signal. A first filter circuit of a predetermined order for limiting a horizontal frequency of the generated luminance signal to a predetermined range and outputting the restricted luminance signal of the horizontal frequency; A second filter circuit that generates a luminance signal for a horizontal contour correction signal based on the second filter circuit and has a lower order than the first filter circuit; Horizontal contour correction signal extracting means for extracting a signal of a frequency band having a predetermined peak frequency as a horizontal contour correction signal from the luminance signal generated by the filter circuit, and a first filter circuit for extracting the extracted horizontal contour correction signal from the first filter circuit And an adding circuit for adding to the output luminance signal.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In the present embodiment,
The present invention will be described by exemplifying a home camcorder such as an 8 mm video camera. This video camera is a complementary color mosaic single-chip CCD color camera.

FIG. 1 is a block diagram showing the configuration of the video camera. The video camera 10 includes a CCD unit 11,
CDS (correlated double sampling) unit 12, AGC unit 1
3. ADC (analog-digital converter) 14, color separation unit 15, luminance signal processing unit 16, first DAC (digital-analog converter) 17, color signal processing unit 18, and second
(Digital-analog converter) 19.
First, the configuration of each unit will be described. The CCD unit 11
It has one CCD (Charge Coupled Device) and converts the captured video into an electric signal and outputs it to the CDS unit 12.
This CCD has, for example, about 250,000 to 400,000 pixels in a pixel area of about 1/4 to 1/6, and a color filter is already provided for each pixel in a photoresist process. On-chip color filter (OCC
F) CCD. The arrangement of the color filters is a complementary color mosaic arrangement as shown in FIG.

A CDS (Correlated Double Sampling) unit 12 performs a sample / hold (S
/ H) is a circuit having a circuit that shapes a signal input from the CCD unit 11 and removes random noise included in the input signal. Further, defect correction is also performed by holding the value before stopping the sampling pulse of the S / H circuit. The signal shaped by the CDS unit 12 is output to the AGC unit 13.

AGC (Automatic Gain Control) section 13
Amplifies the signal input from the CDS unit 12 by feedback-controlling the amplification gain so that the amplitude of the signal is always constant even if the magnitude of the output signal from the CCD unit 11 changes. The obtained signal is output to the ADC 14.

An ADC (Analog-Digital Converter) 14 converts the signal input from the AGC unit 13 into a digital signal by A / D conversion with, for example, 8 to 16 bits, and converts the signal into a digital signal. Output to

The color separation section 15 separates the signal input from the ADC 14 into a luminance signal and two kinds of color difference signals, and outputs the signals to a luminance signal processing section 16 and a color signal processing section 18, respectively. The luminance signal is obtained by converting the DC component of the signal input from the AGC unit 13 into an LPF (Low Pass Filter).
, And each color difference signal is obtained by converting a fundamental wave component of the signal input from the AGC unit 13 into a BPF (Band
Each signal is detected by separation by a Pass Filter.

The luminance signal processing unit 16 performs signal processing such as gamma correction, addition of a contour correction signal, and addition of a motive signal to the luminance signal input from the color separation unit 15, and converts the obtained signal into a fourth signal. 1 to the DAC 17. The process of adding the contour correction signal according to the present invention, that is, the contour correction process performed by the luminance signal processing unit 16 is as follows.
Details will be described later.

A first DAC (Digital-Analog Converter:
The digital-analog converter 17 is a part of the luminance signal processing unit 1.
The luminance signal input from 6 is converted into an analog signal by D / A conversion and output as a luminance signal Y of a television signal of a predetermined system such as NTSC.

The color signal processing unit 18 performs signal processing such as primary color separation, white balance, gamma correction, formation of a color difference signal, and modulation processing on the color difference signal input from the color separation unit 15 to perform two color difference signals. The signals RY and BY are generated and output to the second DAC 19.

A second DAC (Digital-Analog Converter:
Digital-analog converter) 19 is a color signal processing unit 18
The input color difference signals are D / A converted into analog signals, and output as color difference signals RY and GY of a television signal of a predetermined system such as NTSC.

Next, the video camera 10 having such a configuration will be described.
The operation of is described together. A video signal obtained by photographing in the CCD unit 11 is input to the CDS unit 12 and subjected to processing such as waveform shaping, removal of random noise and correction of defects, and the AGC unit 13 adjusts the gain so as to have a predetermined amplitude. Then, the signal is converted into a digital signal in the ADC 14. The video signal converted into the digital signal is separated by the color separation unit 15 into a luminance signal and two color difference signals.

The separated luminance signal is supplied to a luminance signal processing unit 1.
In 6, processing such as gamma correction and contour correction is performed, a synchronizing signal is added, and the first DAC 17 returns to an analog signal and outputs it as a luminance signal Y.
On the other hand, the separated color signal processing unit 18
8, the primary colors are separated and converted into R, G, B signals,
Processing such as white balance and gamma correction is performed, the matrix circuit returns the color difference signal again, the subcarrier is modulated by the modulation processing, and finally the second DAC 1
The signal is converted back to an analog signal by 9 and output as color difference signals RY and BY.

Next, an outline correction circuit according to the present invention, which is included in the luminance signal processing section 16 of the video camera 10, will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the contour correction circuit 100.
The contour correction circuit 100 includes a first delay circuit 102 (1HD
L1), a second delay circuit 104 (1HDL2), a first adder 106, a divider 107, a subtractor 108, a first L
PF110 (LPF1), second LPF112 (LPF
2), a first multiplier 114, and a third LPF 116 (LP
F3), a fourth LPF 118 (LPF4), a second adder 120, a slice circuit 122 (SLICE), a first BPF 124 (BPF1), a second multiplier 126, a second
BPF 128 (BPF2), a third multiplier 130, a third adder 132, and a fourth adder 134.

First, the function of each component will be described.
The first delay circuit 102 generates a signal S ₁ delayed by one scanning line from the input video signal S ₀ . The second delay circuit 104 further delays the signal S ₁ generated in the first delay circuit 102 by one scanning line,
Generating a signal S ₂ obtained by the scanning line two pins delaying the video signal S _0.

The first adder 106 adds the input video signal S _0, and a signal S ₂ where the video signal S ₀ generated by the second delay circuit 104 to the scanning line 2 duty delay .
The divider 107 reduces the amplitude of the signal added by the first adder 106 to １ ／, and obtains a signal (S ₀ + S ₂ ) / 2 in the same range as the original video signal. The subtractor 108
The signal (S ₀ + S ₂ ) / (S ₀ + S ₂ ) obtained in the divider 107 from the signal S ₁ generated in the first delay circuit 102
Vertical aperture control that subtracts 2 and extracts only the vertical contour
(Aperture Control) Signal A is calculated.

The first LPF 110 includes a first delay circuit 1
Predetermined high-frequency component of the signal S ₁ generated cut at 02, to generate a luminance signal of the main line of the contour correction signal is added. The first LPF 110 is a filter based on 1 + Z ⁻¹ and having four or more taps to suppress a decrease in horizontal frequency characteristics. Second LPF 112
Is a horizontal LPF for a vertical contour correction signal, and the first L
This is a filter having a band narrower than that of the PF 110. The second adder 120 cuts a predetermined high-frequency component of the vertical aperture control signal A calculated by the subtractor 108, and
4 is output. The first multiplier 114 is a second adder 1
20 to the vertical aperture control signal A input from the
To generate a vertical contour correction signal to be added to the luminance signal. The generated vertical contour correction signal is supplied to a fourth adder 1
34.

The third LPF 116 is a first delay circuit 1
This is a pre-filter for generating a signal for generating a horizontal contour correction signal having a peak at f _S / 4 from the signal S ₁ generated in 02. The third LPF 116 is 1+
It has the property of Z ^-1 The fourth LPF 118 includes a divider 1
07 (S ₀ + S ₂ ) / 2, f _s /
This is an LPF for generating a luminance signal for generating a horizontal contour correction signal having a peak at 2. Fourth LPF1
18 also has the characteristic of 1 + Z ⁻¹ like the third LPF 116. Therefore, the video signal input to the contour correction circuit 100 is subjected to (1 + Z ⁻² ) / 2 + Z ⁻¹ filter processing. Second adder 120
Is the signal generated by the third LPF 116 and the fourth LF
The signals generated by the PF 118 are added to generate a signal for generating a horizontal contour correction signal having a peak at f _S / 2. The slice circuit 122 suppresses the level of the signal generated by the second adder 120 in the negative direction at a predetermined level.

The first BPF 124 includes the slice circuit 12
2, a signal in a predetermined band having a peak at f _s / 2 is detected as a horizontal contour signal, and is output to the second multiplier 126. The second multiplier 126 multiplies the horizontal contour signal having a peak at f _s / 2 detected by the first BPF 124 by a predetermined gain β to generate a horizontal contour correction signal having a peak at f _s / 2. I do. Second BPF 12
8, from the third signal generated by the LPF116 of, f _S
A signal in a predetermined band having a peak at / 4 is extracted as a horizontal contour signal and output to the third multiplier 130. The third multiplier 130, f _S detected by the second BPF128
The horizontal contour signal having a peak at / 4 is multiplied by a predetermined gain θ to generate a horizontal contour correction signal having a peak at f _S / 4.

The third adder 132 is connected to the second multiplier 12
A horizontal contour correction signal having a peak at f _S / 2 generated in 6, the f _S / 4 generated by the third multiplier 130 adds the horizontal contour correction signal having a peak, a horizontal aperture compensation signal Generate and output to the fourth adder 134. The fourth adder 134 adds the vertical aperture control signal output from the first multiplier 114 and the horizontal aperture control signal output from the third adder 132 to the luminance signal main line output from the first LPF 110. Then, it is output as a luminance signal subjected to contour correction.

Next, the contour correction circuit 10 having such a configuration will be described.
The operation of 0 will be described. Input video signal S
_0, is one scanning line delay in the first delay circuit 102 is a video signal S _1, it is the first LPF110 the luminance signal main line. On the other hand, the video signal S ₁ is further delayed by one scanning line in the second delay circuit 104 to be a video signal S _2, and is added to the original input video signal S ₀ in the first adder 106, After being halved by the divider 107, the difference from the video signal S ₁ is obtained by the subtracter 108, thereby calculating a vertical aperture control signal A which is a vertical contour signal. This vertical aperture control signal A is
The signal is multiplied by a predetermined coefficient α in the first multiplier 114 via the second LPF 112 and applied to the fourth adder 134 as a vertical contour correction signal to be added to the luminance signal.

The signal S ₁ generated in the first delay circuit 102 is converted to a third LP signal having a characteristic of 1 + Z ^−1.
F116 as a pre-filter and a third LPF
From the signal obtained from 116, a signal of a predetermined band having a peak at f _S / 4 is extracted in the second BPF 128, and further multiplied by a predetermined gain θ in the third multiplier 130, and f _S / 4 is multiplied by Generate a horizontal contour correction signal having a peak.

The signal (S ₀ + S ₂ ) / 2 output from the divider 107 is passed through the fourth LPF 118 having the characteristic of 1 + Z ⁻¹ , so that the input video signal S
_{For 0} , a signal is generated which has been subjected to a vertical interpolation filter process that traps 1/2 of the sampling frequency of (1 + Z ⁻² ) / 2 + Z ⁻¹ . This signal and the third L
A signal obtained by adding the signal generated by the third LPF 116 by the PF 116 is generated by the second adder 120, the level in the minus direction is suppressed to a predetermined level in the slice circuit 122, and then the signal is generated by the first BPF 124. , F _s / 2
, A signal of a predetermined band having a peak is extracted, and a second multiplier 126 multiplies the signal by a predetermined gain β to generate a horizontal contour signal having a peak at f _s / 2.

The horizontal contour correction signal having a peak at f _s / 2 generated by the second multiplier 126 and the horizontal contour having a peak at f _s / 4 generated by the third multiplier 130 The correction signal and the correction signal are added in a third adder 132 to generate a horizontal aperture control signal. In a fourth adder 134, the vertical aperture control signal output from the first multiplier 114 and the third The horizontal aperture control signal output from the adder 132 is added and output as a luminance signal subjected to contour correction.

As described above, according to the contour correction circuit 100 of the present embodiment, the LPF (first
LPF 110) and the LPF for the horizontal contour correction signal (the third LPF 116 and the fourth LPF 118) are separated, so that the characteristic of 1 + Z ⁻¹ can be used for the horizontal contour correction signal. And the characteristics are improved. Further, among the horizontal contour correction signals, a signal having a characteristic of f _s / 2 in which a problem of a cross color occurs occurs.
Since the vertical filter processing of (1 + Z ⁻² ) / 2 + Z ⁻¹ is performed, no cross color is generated near the edge even when the horizontal contour is emphasized, so that the deterioration of the image quality can be suppressed.
Further, among the horizontal contour correction signals, a signal having a characteristic of f _s / 2 in which the characteristic of the horizontal edge greatly affects the image quality is subjected to the slicing processing for the minus component, so that the signal in the horizontal direction is processed. Even if a large gain is given to the horizontal contour correction signal of f _s / 2 in order to increase the sharpness, it is possible to suppress an increase in the false horizontal luminance signal and improve the image quality.

The present invention is not limited to the present embodiment, and various suitable modifications are possible. For example, the configuration of the video camera 10 other than the contour correction circuit 100 may be arbitrarily changed. For example, the signal processing other than the contour correction performed by the luminance signal processing unit 16 does not have to include all the above-described processing, and may include other processing. The same applies to the processing performed in the color signal processing unit 18. The video camera 10 described above is configured to perform signal processing using digital signals, but may be configured to perform similar processing in the state of analog signals.

Further, the present invention is not limited to the 8 mm video camera as described above, but can be applied to any camera device. For example, it may be a multi-plate CCD camera such as a three-plate CCD camera, or may be a broadcast station or business camera. In addition, a camera having an arbitrary color filter array including a primary color array other than the complementary color mosaic array or a black and white video camera may be used. In addition, other than the NTSC system, for example, PAL and SECAM
A video camera that outputs a video signal of such a system may be used.

[0039]

As described above, according to the present invention, it is possible to provide a horizontal contour correction circuit capable of appropriately performing horizontal contour correction while preventing deterioration in image quality, thereby obtaining a high-definition and high-quality image. Can be. Further, by using such a horizontal contour correction circuit, a camera system capable of capturing a clear and high-quality image can be provided.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a configuration of a contour correction circuit according to the present invention included in a luminance signal processing unit of the video camera shown in FIG. 1;

FIG. 3 is a diagram for explaining color coding using a complementary color mosaic array.

FIG. 4 is a block diagram showing a configuration of a conventional contour correction circuit.

FIG. 5 is a diagram for explaining a level difference in a horizontal contour correction signal between lines near a horizontal edge.

[Explanation of symbols]

10 video camera, 11 CCD unit, 12 CDS
Section, 13 AGC section, 14 ADC, 15 ... color separation section,
Reference numeral 16: luminance signal processing unit, 17: first DAC, 18: color signal processing unit, 19: second DAC, 100: contour correction circuit, 102: first delay circuit, 104: second delay circuit, 106 ... first adder, 107 ... divider, 108 ...
Subtractor, 110: first LPF, 112: second LPF
F, 114 ... first multiplier, 116 ... third LPF, 1
18 Fourth LPF, 120 Second adder, 122
Slice circuit, 124 first HPF, 126 second multiplier, 128 second HPF, 130 third multiplier, 132 third adder, 134 fourth adder

Claims (9)

[Claims] 1. A luminance signal generated based on pixel data read in a field accumulation mode by an image pickup means having an image pickup element for each of a plurality of pixels arranged by a predetermined color coding. A circuit for performing correction, comprising: a first filter circuit of a predetermined order that limits a horizontal frequency of the generated luminance signal to a predetermined range and outputs a luminance signal with the horizontal frequency restricted; A second filter circuit having a lower order than the first filter circuit for generating a luminance signal for a horizontal contour correction signal based on the obtained luminance signal; and a luminance signal generated by the second filter circuit. A horizontal contour correction signal extracting means for extracting a signal in a frequency band having a predetermined peak frequency as a horizontal contour correction signal; and A correction circuit for adding to the luminance signal output from the first filter circuit. 2. A method according to claim 1, wherein the plurality of second filters perform different filter operations.
And a plurality of the horizontal contour correction signal extracting means provided corresponding to the second filter circuit and extracting signals in frequency bands having different predetermined peak frequencies, respectively. 2. The horizontal contour correction circuit according to claim 1, wherein a plurality of horizontal contour correction signals extracted by said plurality of horizontal contour correction signal extracting means are added to a luminance signal output from said first filter circuit. 3. The plurality of horizontal contour correction signal extracting means,
A horizontal contour correction signal extracting means for extracting a signal in a frequency band having a frequency equal to a half of the sampling frequency f _S as a peak frequency; and a second signal generating a luminance signal processed by the horizontal contour correction signal extracting means. filter circuit, a horizontal contour correction circuit according to claim 2 having a vertical interpolation filter circuit so as to trap the half of the frequency of the sampling frequency f _S. 4. A slicing circuit for slicing a minus component of a signal generated by a second filter circuit having the interpolation filter circuit, wherein a horizontal contour correction signal extraction corresponding to the second filter circuit is performed. 4. The horizontal contour correction circuit according to claim 3, wherein the means extracts the horizontal contour correction signal from the luminance signal sliced by the slice circuit. 5. The apparatus according to claim 1, further comprising gain control means for controlling each of the horizontal contour correction signals extracted by said plurality of horizontal contour correction signal extraction means to a predetermined gain. 5. The horizontal contour correction circuit according to claim 4, wherein the plurality of horizontal contour correction signals are added to a luminance signal output from the first filter circuit. 6. The first filter circuit has a basic characteristic of 1 + Z ⁻¹ and has a plurality of taps, and the second filter circuit has a characteristic of 1 + Z ^−1. The horizontal contour correction circuit according to claim 1. 7. An image pickup device having an image pickup device for each of a plurality of pixels arranged in a predetermined color coding and outputting the pixel data in a field accumulation mode; and a luminance signal and a luminance signal based on the output pixel data. A camera system comprising: a first signal processing unit that generates a color signal; and a contour correction unit that performs at least a horizontal contour correction on the generated luminance signal. A first filter circuit of a predetermined order for limiting the horizontal frequency of the generated luminance signal to a predetermined range and outputting the restricted luminance signal of the horizontal frequency; and a horizontal contour correction based on the generated luminance signal. A second filter circuit that generates a luminance signal for the signal, the second filter circuit having a lower order than the first filter circuit; and a luminosity generated by the second filter circuit. Horizontal contour correction signal extracting means for extracting a signal in a frequency band having a predetermined peak frequency as a horizontal contour correction signal from the signal, and converting the extracted horizontal contour correction signal into a luminance signal output from the first filter circuit. A camera system having an addition circuit for adding. 8. The contour correcting means includes: first delay means for delaying the generated luminance signal by one scanning line period; and further delaying the luminance signal delayed by one scanning line period by one scanning line period. A second delay unit for generating a vertical contour signal based on the generated luminance signal, the luminance signal delayed by the first delay unit, and the luminance signal delayed by the second delay unit. The camera system according to claim 7, further comprising: a vertical contour signal generating unit; and a vertical contour correcting unit configured to correct a vertical contour of the generated luminance signal based on the generated vertical contour signal. 9. The camera system according to claim 8, wherein said imaging means is a single CCD.