JPH05130645A - Signal processing circuit - Google Patents

Abstract

PURPOSE:To improve picture quality by allowing image signal processing to correspond to an image display system where a moving image system and a still image system coexist. CONSTITUTION:This signal processing circuit is provided with a common luminance signal processing circuit 8 for applying luminance signal processing and chroma signal processing corresponding to a standard common to a moving image and a still image to an image pickup signal S inputted from a CCD solid state image pickup element 1, a common chroma signal processing circuit 8, a moving image luminance signal processing circuit 9 for executing luminance signal processing only for a moving image and a still image luminance signal processing circuit 10 for executing luminance signal processing only for a still image which are connected to the post stage of the circuit 8, a moving image chroma signal processing circuit 12 for executing chroma signal processing only for a moving image and a still image chroma signal processing circuit 13 for executing chroma signal processing only for a still image which are connected to the post stage of the circuit 11 and constituted so that a luminance signal Y1 from the circuit 9, a chroma signal C1 from the circuit 12, a luminance signal Y2 from the circuit 10, and a chroma signal C2 from the circuit 13 are simultaneously outputted in parallel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving image such as an interlace system (a system for outputting 262.5 scanning lines in one field) or a double speed scanning system (a system for outputting 525 scanning lines in one field). The present invention relates to a signal processing circuit suitable for application to an image display system in which a system and a still image system such as an electronic still camera are mixed.

[0002]

2. Description of the Related Art Currently, as an image display device, a moving image system for a standard such as a general interlaced television (NTSC system) which scans 262.5 lines in one field, and a double speed scanning system, for example, a non-interlaced system. There is a moving image / still image system for the standard of scanning 525 lines in one field, such as a television (ED or HD high-definition television, a monitor for an electronic still camera) or an electronic still camera.

The interlaced moving image system and the double-speed scan still image system will be described below.

Conventionally, a signal processing circuit compatible with these moving image systems and a signal processing circuit compatible with a still image system have been separately configured as completely different circuits. This is because the interlaced moving image system and the double-speed scan still image system are currently being supplied to the market as single units.

[0005]

However, due to various developments of image display systems, currently, a moving image system for a standard such as an interlaced television (NTSC system) which scans 262.5 lines in one field, and a double speed scan are used. 2. Description of the Related Art An image display system, such as an electronic still camera of the type, in which a still image system conforming to the standard of scanning 525 lines in one field is mixed, has been put into practical use.

In order to support the signal processing of this image display system, it is necessary to mount a signal processing circuit for a moving image system and a signal processing circuit for a still image system. However, if these signal processing circuits are simply mounted, the scale of the image display system becomes large and the circuit configuration becomes complicated.

Therefore, conventionally, only the signal processing circuit for the moving image system is mounted on the above-mentioned image display system and is also used as the signal processing circuit for the still image system.

However, since the display object is a color photographic paper, the still image system needs to perform a gamma correction process or the like different from the moving image system. Also, in the aperture compensating process, the interlace system and the double speed scanning are performed. Since the frequency band to be emphasized is different from that of the system, it is necessary to perform the aperture control processing according to that. Therefore, conventionally, the signal processing of the image display system is performed while sacrificing the image quality of the still image system.

The present invention has been made in view of the above problems, and an object thereof is to display an image in which an interlaced moving image system for image signal processing and a double speed scan still image system are mixed. It is an object of the present invention to provide a signal processing circuit which can be adapted to a system and can improve the image quality of the image display system.

[0010]

The present invention relates to an image pickup signal S from a CCD solid-state image pickup device 1 which reads out all pixels independently.
A common luminance signal processing circuit 8 and a common chroma signal processing circuit for performing a luminance signal processing and a chroma signal processing corresponding to the common standard of each image display device in the interlace method and the double speed scanning method for scanning at a double speed with respect to the interlace method. 11, a first individual luminance signal processing circuit 9 for performing luminance signal processing corresponding to individual standards in an interlace type image display apparatus connected to the subsequent stage of the common luminance signal processing circuit 8 and a double speed scanning type image display apparatus. The luminance signal processing corresponding to individual standards in
The individual luminance signal processing circuit 10 and the first individual chroma signal processing circuit 12 for performing chroma signal processing corresponding to individual standards in the interlaced image display device connected to the subsequent stage of the common chroma signal processing circuit 11 and double speed Second individual chroma signal processing circuit 13 for performing chroma signal processing corresponding to individual standards in a scan type image display device
Are provided, the first luminance signal Y1 from the first individual luminance signal processing circuit 9, the first chroma signal C1 from the first individual chroma signal processing circuit 12, and the second luminance signal processing circuit 10 from the second individual luminance signal processing circuit 10 are provided. The second luminance signal Y2 and the second chroma signal C2 from the second individual chroma signal processing circuit 13 are output in parallel and simultaneously.

[0011]

According to the above-described configuration of the present invention, the first luminance signal Y1 and the first luminance signal Y1 output through the first individual luminance signal processing circuit 9 are applied to the moving image system in the interlaced television (NTSC) standard. Using the first chroma signal C1 output through the first individual chroma signal processing circuit 12, for the still image system in the standard of the double speed scan type image display device (such as an electronic still camera), the second individual chroma signal C1 is used. The second luminance signal Y2 output through the luminance signal processing circuit 10 and the second chroma signal C2 output through the second individual chroma signal processing circuit 13 can be used, and depending on the interlace and double speed scan methods. Image signal processing can be performed separately in each system.

Therefore, according to the signal processing circuit of the present invention, the image signal processing can be applied to the image display system in which the interlaced moving image system and the double speed scanning still image system are mixed. The image quality of the display system can be improved.

Further, in the interlaced moving image system and the double speed scan still image system, the common luminance signal processing circuit 8 and the common chroma signal processing circuit 11 can perform a part where the image signal processing can be shared. The entire circuit configuration can be reduced, and the image display system can be efficiently downsized and the power consumption can be reduced.

[0014]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a schematic configuration of the signal processing circuit according to the present embodiment.

Here, the CCD solid-state image pickup device 1 used in the present embodiment adopts an all-pixel reading method in which signal charges relating to all pixels are independently read, and two horizontal registers (not shown) are arranged in parallel. It has an arranged configuration. In this example, one horizontal register is one channel (1ch) and the other one is 2 channels.
It is handled as a channel (2ch).

In the CCD solid-state image pickup device 1, three color filters of green G, yellow Ye and cyan Cy are subjected to checkered coding as shown in FIG. 6A or stripe coding as shown in FIG. 6B. ing.

Then, as shown in FIG. 1, the image pickup signals Sch1 and Sc from the respective channels of the CCD solid-state image pickup device 1 are obtained.
h2 is sequentially supplied to the synchronization processing circuit 2 incorporating a plurality of delay lines, and the image pickup signals Sch1 and S
During ch2, the image pickup signals S regarding a predetermined number of scanning lines are synchronized. The image pickup signals S relating to these synchronized predetermined scanning lines are supplied to the aperture control processing unit 3 and the luminance signal processing unit 4, respectively.
And the chroma signal processing unit 5 in parallel.

The aperture control processing section 3 has a moving image aperture control circuit 6 and a still image aperture control circuit 7. The moving image aperture control circuit 6 has a frequency band (1) corresponding to the standard of the moving image system (for example, NTSC television) of the interlace method (method of outputting 262.5 scanning lines in one field) of the image pickup signal S. ˜2 MHz) signal components are emphasized and output as a moving image aperture control signal AP1. The still image aperture control circuit 7 uses the image pickup signal S
Among them, double speed scanning method (scanning line 52 in one field
The signal component of the frequency band (for example, 3 to 4 MHz) corresponding to the standard of the still image system of (five output) is emphasized and output as the still image aperture control signal AP2.

The luminance signal processing section 4 has a common luminance signal processing circuit 8, a moving image luminance signal processing circuit 9 and a still image luminance signal processing circuit 10. The common luminance signal processing circuit 8 incorporates a common portion of the luminance signal processing in the interlaced moving image system and the luminance signal processing in the double speed scanning still image system. Accordingly, the moving image luminance signal processing circuit 9 and the still image luminance signal processing circuit 10 in the subsequent stage respectively perform the luminance signal processing dedicated to the interlaced moving image system and the luminance signal processing dedicated to the double speed scan still image system.

Then, the moving image aperture control signal AP1 output from the moving image aperture control circuit 6 of the aperture control processing unit 3 and the luminance signal Si output from the moving image luminance signal processing circuit 9 of the luminance signal processing unit 4 are combined. The luminance signal Y1 for a moving image is obtained from the output terminal φy1. At the same time, the 1ch still image aperture control signal AP21 output from the still image aperture control circuit 7 of the aperture control processing unit 3 and the 1ch luminance signal Sn1 output from the still image luminance signal processing circuit 10 of the luminance signal processing unit 4 are output. The 1ch still image luminance signal Y21 is obtained by synthesizing, and the still image aperture control circuit 7 of the aperture control processing unit 3 is obtained.
The 2ch still image aperture control signal AP22 output from the 2ch still image luminance signal processing circuit 10 and the 2ch luminance signal Sn2 output from the still image luminance signal processing circuit 10 are combined to obtain the 2ch still image luminance signal Y22. The 1ch still picture luminance signal Y21 and the 2ch still picture luminance signal Y22 are combined to obtain a still picture luminance signal Y2 corresponding to the information of 525 fields per field from the output terminal φy2.

On the other hand, the chroma signal processing section 5 has a common chroma signal processing circuit 11, a moving picture chroma signal processing circuit 12 and a still picture chroma signal processing circuit 13. The common chroma signal processing circuit 11 incorporates a common part of the chroma signal processing in the interlaced moving picture system and the chroma signal processing in the double speed scan still image system.

Therefore, the moving picture chroma signal processing circuit 12 and the still picture chroma signal processing circuit 13 in the subsequent stage respectively perform the chroma signal processing for the interlace type moving picture system and the chroma signal processing for the double speed scan type still picture system. Then, the moving picture chroma signal C1 and the still picture chroma signal C2 are obtained from the output terminals φc1 and φc2.

Video luminance signal Y1 and video chroma signal C from the output terminals φy1, φc1, φy2 and φc2.
1, still image luminance signal Y2 and still image chroma signal C2
Are output simultaneously and in parallel.

Next, a specific example of the signal processing circuit according to this example will be described with reference to FIGS. 2 is a block diagram showing Y-system signal processing, and FIG. 3 is a block diagram showing chroma-system signal processing.

In FIG. 2, reference numerals 21 and 22 surrounded by a chain line indicate a 1ch synchronization processing circuit and a 2ch synchronization processing circuit, respectively. In this example, the image pickup signal Sch1 relating to the even-numbered scanning lines is input from 1ch, and the image pickup signal Sch2 relating to the odd-numbered scanning lines is input from 2ch.

Two delay lines are incorporated in the 1ch synchronization processing circuit 21, and three even-numbered (6n + 2, 6n + 4, 6n + 6; n = 0,
The image pickup signals S2, S4, and S6 related to 1, 2, ...) Are respectively synchronized and output. In addition, three delay lines are incorporated in the 2ch synchronization processing circuit 22, and four odd-numbered (8n + 1, 8n +) from each output terminal.
3, 8n + 5, 8n + 7; n = 0, 1, 2, ...), and the image pickup signals S1, S3, S5, and S7 are respectively synchronized and output.

First, the Y-system signal processing will be described with reference to FIG. 2. Of the seven image pickup signals S1 to S7 from the 1ch synchronization processing circuit 21 and the 2ch synchronization processing circuit 22,
The image pickup signals S3 and S4 relating to (8n + 3) and (6n + 4) are supplied as the Y main line 23 to the moving image mixing circuit 24 and the first still image mixing circuit 25 in the subsequent stage, and are branched from the Y main line 23. The two image pickup signals S3 and S4 are input to the first horizontal aperture compensation processing circuit 26 for contour correction, and the contour correction signal APh
Is supplied to the moving picture mixing circuit 24 and the first still picture mixing circuit 25 in the subsequent stage.

Of the seven image pickup signals S1 to S7 from the respective synchronization processing circuits 21 and 22, the six image pickup signals S1 to S6 excluding the signal related to (8n + 7) are the same as the first Y _L processing circuit 27. And the first 1/4 V aperture control processing circuit 28 are respectively input in parallel to each of the processing circuits 27 and 2
The low-frequency luminance signal Y _L and the 1/4 V aperture control signal AP1 are output from the respective 8 and the moving image mixing circuit 24 in the subsequent stage is output.
And to the first still image mixing circuit 25.
At the same time, the image pickup signals S3, S4, and S5 are input to the first 1 / 2V aperture control circuit 29, and the 1 / 2V aperture control signal AP2 is output from the aperture control circuit 29 to output the first still image mixing circuit in the subsequent stage. 25.

Here, the first 1 / 2V aperture control processing circuit 29 is a signal processing circuit for boosting the frequency near 525 vertical lines by gain control based on the input of the image quality adjustment voltage, and the first 1 / 4V. The aperture control processing circuit 28 is
By controlling the gain based on the input of the image quality adjustment voltage, the vertical 2
It is a signal processing circuit that boosts frequencies around 63 lines.

That is, the vertical array pitch of the color filters shown in FIG. 6 is Py and the horizontal array pitch is Px, and in FIG. 4, the vertical axis represents the vertical frequency and the horizontal axis represents the horizontal frequency. In this case, the first 1 / 4V aperture control circuit 28 boosts the frequency around 1 / (2Py) (the hatched area in FIG. 4A) (FIG. 4B).
reference). In addition, the first 1/2 V aperture control processing circuit 2
9 is in the vicinity of 1 / Py (hatched area in FIG. 4C)
Boost the frequency (see FIG. 4D).

In the still image system of the double speed scanning system, vertical resolution is required up to 525 lines. Therefore, the aperture control signal AP2 from the first 1 / 2V aperture control processing circuit 29 and the first 1/4 aperture control process are processed. The aperture control signal AP1 from the circuit 28 is synthesized by the first still picture mixing circuit 25 in the next stage, and the signal component of the frequency band (for example, 3 to 4 MHz) corresponding to the standard of the double speed scan still picture system is emphasized. ..

On the other hand, in the interlaced moving image system, since it is sufficient to obtain vertical resolution of about 263 lines, only the aperture control signal AP1 from the first 1 / 4V aperture control processing circuit 28 is supplied to the moving image mixing circuit 24. Then, an interlaced video system (for example, N
A signal component in a frequency band (1 to 2 MHz) corresponding to the TSC system television standard is emphasized.

On the other hand, the 1ch synchronization processing circuits 21 and 2
Seven imaging signals S1 to S1 from the ch synchronization processing circuit 22
The image pickup signals S4 and S5 relating to (6n + 4) and (8n + 5) of S7 are supplied to the second still image mixing circuit 31 as the Y main line 30, and the Y main line 30 is also supplied.
The two image pickup signals S4 and S5 branched from are input to the second horizontal aperture control processing circuit 32 for contour correction, and the contour correction signal APh is supplied to the second still image mixing circuit 31 in the subsequent stage. Supplied.

Of the seven image pickup signals S1 to S7 from the respective synchronization processing circuits 21 and 22, the six image pickup signals S2 to S7 excluding the signal relating to (8n + 1) are the same as the second Y _L processing circuit 33. And the second 1 / 4V aperture control processing circuit 34 are input in parallel, and the processing circuits 33 and 3 are input.
The low frequency luminance signal Y _L and the 1/4 V aperture control signal AP1 are output from the respective 4 and are supplied to the second still image mixing circuit 31 in the subsequent stage. At the same time, the image pickup signal S4
S5 and S6 are input to the second 1 / 2V aperture control circuit 35, and the 1 / 2V aperture control signal AP2 is output from the aperture control circuit 35 and supplied to the second still image mixing circuit 31 in the subsequent stage.

The second 1 / 4V aperture control processing circuit 34.
The second ½ aperture controller processing circuit 35 has the same configuration as the first ¼ V aperture controller processing circuit 28 and the first ½ aperture controller processing circuit 29. Therefore, the second
1/4 output from the 1/4 V aperture control processing circuit 34
By combining the aperture control signal AP1 and the 1/2 aperture control signal AP2 output from the second 1/2 V aperture control processing circuit 35 in the second still image mixing circuit 31 in the subsequent stage, a double-speed scan still image is obtained. A signal component in a frequency band (for example, 3 to 4 MHz) corresponding to the system standard is emphasized.

The high-band luminance signal Y _H from the moving picture mixing circuit 24 is input to the moving picture gamma correction circuit 36 in the next stage. In this gamma correction circuit 36,
Performing gamma correction corresponding to the color picture tube in the moving system interlaced with respect to the luminance signal Y _H. Luminance signal Y _H, which is gamma-corrected by the video gamma correction circuit 36, blanking processing at the subsequent stage of the moving image processing circuit 37, the setup (DC component reproduction) processing, white clip processing and synchronous addition processing, etc. Is performed, and is output as the moving image luminance signal Y1 from the output terminal φy1.

On the other hand, the first still image mixing circuit 25
The high-band luminance signal Y _H a from is input to the first still image gamma correction circuit 38 in the next stage. In the gamma correction circuit 38 performs gamma correction corresponding to the color photographic paper in the still picture system speed scan method with respect to the luminance signal Y _H a. The first still picture luminance signal Y _H a that is gamma corrected by the gamma correction circuit 38, blanking processing at the subsequent stage of the first still picture image processing circuit 39,
Setup (reproduction of DC component) processing, white clip processing, synchronous addition processing, and the like are performed and output as the first still image luminance signal Y2a.

The second still picture mixing circuit 31 is also provided.
The high-band luminance signal Y _H b from is input to the second still image gamma correction circuit 40 at the next stage. In the gamma correction circuit 40, as in the case of the first still image gamma correction circuit 38, the gamma correction corresponding to the color photographic paper in the double speed scan still image system is performed on the luminance signal Y _H b. To do. The luminance signal Y _H b gamma-corrected by the second still image gamma correction circuit 40 is subjected to blanking processing and setup (reproduction of direct current) processing by the second still image processing circuit 41 in the subsequent stage. , White clip processing, synchronous addition processing, and the like are performed, and the second still image luminance signal Y2b is output.

The first and second still image luminance signals Y2a and Y2b from the first and second image processing circuits 39 and 41 are combined in the frame mixing circuit 42 in the next stage, and the output terminal φy2 is output. Is taken out as a still image luminance signal Y2.

The moving image luminance signal Y1 and the still image luminance signal Y2 are output simultaneously and in parallel from the corresponding output terminals φy1 and φy2.

The moving image gamma correction circuit 36 and the first and second still image gamma correction circuits 38 and 40 will now be described.

[0042] First, video gamma correction circuit 36 (indicated by the curve) of the luminance signal Y _H from the moving image mixing circuit 24, as shown in FIG. 5A, the gamma correction curve based on electro-optic conversion characteristics of a color picture tube Is converted to a value corresponding to and output. For example, the value Vo1 on the gamma correction curve at the input value Vi is output as a gamma correction value, and as indicated by the proportional straight line, the luminance signal Y from the moving picture mixing circuit 24 is output.
_Make the amplitude of _H and the emission intensity (brightness) of the color picture tube proportional.

Next, the first and second still image gamma correction circuits 38 and 40 show the luminance signals Y _H a and Y _H b from the respective still image mixing circuits 25 and 31 as shown in FIG. 5B. In addition, it is converted into a value corresponding to a gamma correction curve (shown by a curve) based on the electro-optical conversion characteristics of color photographic paper and output. For example, the value Vo2 on the gamma correction curve at the input value Vi is output as a gamma correction value, and as shown by the proportional straight line, the amplitudes of the luminance signals Y _H a and Y _H b from the still image mixing circuits 25 and 31 are shown. And make the brightness of color photographic paper proportional.

Therefore, if the moving picture gamma correction circuit 36 is connected to the color picture tube side of the moving picture system, the color picture tube has the amplitude of the image pickup signal from the CCD solid-state image pickup device 1 and the emission intensity (brightness) of the color picture tube. Is supplied in proportion to the luminance signal, the intermediate luminance can be raised without changing the white and black signals, and the image quality of the image displayed on the color picture tube is improved.

On the other hand, if the first and second still image gamma correction circuits 38 and 40 are connected to, for example, the electronic still camera side, the electronic still camera has an amplitude and color of the image pickup signal from the CCD solid-state image pickup device 1. A brightness signal proportional to the brightness of the photographic paper is supplied, the intermediate brightness can be raised without changing the white and black signals, and the image quality of the image displayed on the color photographic paper is improved.

Incidentally, here, the Y main line 23, the first horizontal line
Apacon processing circuit 26 and first Y _LUp to processing circuit 27
Corresponds to the common luminance signal processing circuit 8 of FIG.
Kixing circuit 24, video gamma correction circuit 36, and video
The image processing circuit 37 for video is the luminance signal processing circuit 9 for moving picture in FIG.
Corresponding to. In addition, the first 1/4 V aperture control processing circuit 2
8 corresponds to the moving image aperture control circuit 6 of FIG.
2 1/4 V aperture control processing circuits 28 and 29 and the first
And the second 1/2 V aperture control processing circuits 34 and 35 are shown in FIG.
1 corresponds to the still image aperture control circuit 7.

Further, the Y main line 30, the second horizontal aperture control processing circuit 32, the second Y _L processing circuit 33, the first and second still image mixing circuits 25 and 31, and the first and second still images. The gamma correction circuits 38 and 40, the first and second still image processing circuits 39 and 41, and the frame mixing circuit 42 are the still image luminance signal processing circuit 10 of FIG.
Corresponding to.

Next, the chroma signal processing will be described with reference to FIG.

1ch synchronization processing circuit 21 (see FIG. 2)
3 even numbers from (6n + 2,6n + 4,6n +
The image pickup signals S2, S4, and S6 regarding 6) are supplied to the color separation circuit 53 of the next stage through the low-pass filter 51 in the vertical direction and the low-pass filter 52 in the horizontal direction. At the same time, among the four image pickup signals from the 2ch synchronization processing circuit 22 (see FIG. 2), three odd-numbered (8n +
1,8n + 3,8n + 5) image pickup signals S1 and S3
And S5 are supplied to the color separation circuit 53 of the next stage through the vertical low pass filter 54 and the horizontal low pass filter 55.

The color separation circuit 53 separates the supplied line-sequential multiplexed signals S1 to S6 into G, R and B signals, respectively.
Then, the G, R, and B signals are subjected to white balance for color temperature correction. And the color separation circuit 5
The G, R, and B signals from 3 are added to the gamma correction circuit 56 in the subsequent stage
Then, the normal gamma correction (gamma correction corresponding to the color picture tube) is performed in step S4, and the result is supplied to the matrix circuit 57. In the matrix circuit 57, the G, R and B signals are converted into R-
A G signal and a B-G signal are created, and two color difference signals (R-Y signal and B-Y signal) are created from these signals.

Thereafter, on the moving image side, the matrix circuit 57
The two color difference signals (R-Y signal and BY signal) are supplied to the encoder 59 via the moving image low-pass filter 58, and the moving image chroma signal C1 is obtained from the output terminal φc1. On the other hand, on the still image side, 2 from the matrix circuit 57
The two color difference signals (RY signal and BY signal) are directly supplied to the encoder 60, and the still image chroma signal C2 is obtained from the output terminal φc2. The moving image chroma signal C1 and the still image chroma signal C2 are output simultaneously and in parallel from the corresponding output terminals φc1 and φc2.

Here, the low-pass filters 51 and 54 in the vertical direction to the matrix circuit 57 correspond to the common chroma signal processing circuit 11 of FIG. 1, and the moving-image low-pass filter 58 and the encoder 59 include the moving-image chroma signal of FIG. The encoder 60 corresponds to the signal processing circuit 12, and the encoder 60 corresponds to the still image chroma signal processing circuit 13 of FIG.

As described above, according to this example, for the moving image in which the image pickup signal S from the CCD solid-state image pickup device 1 which is read out independently of all the pixels is subjected to the aperture control signal processing corresponding to the standard of the moving image system of the interlace system. An aperture control circuit 6 and a still image aperture control circuit 7 for performing aperture control signal processing corresponding to the standard of a double-speed scan still image system are provided, and a luminance signal processing corresponding to a common standard in the moving image system and the still image system, and A common luminance signal processing circuit 8 and a common chroma signal processing circuit 11 that perform chroma signal processing are provided, and a luminance signal processing for moving images that performs luminance signal processing corresponding to the standard for the moving image system is provided at a stage subsequent to the common luminance signal processing circuit 8. The circuit 9 and the still image luminance signal processing circuit 10 for performing the luminance signal processing corresponding to the standard for the still image system are connected. And, the moving image for the aperture control circuit 6
And the interlaced luminance signal Si from the moving image luminance signal processing circuit 9 are combined to output the moving image luminance signal Y1 from the output terminal φy1 and the still image from the still image aperture control circuit 7 is output. The aperture control signals AP21 and AP22 for use with the luminance signals Sn1 and Sn2 from the still image luminance signal processing circuit 10 are respectively synthesized to output the still image luminance signal Y2 from the output terminal φy2, and further, the common chroma signal processing is performed. A video chroma signal processing circuit 12 for performing a chroma signal processing corresponding to the standard for the video system in the latter stage of the circuit 11 and outputting a video chroma signal C1 from the output terminal φc1 and the standard for the still image system. Chroma signal processing for still images that performs the above-described chroma signal processing and outputs the chroma signal C2 for still images from the output terminal φc2. Connect the circuit 13, the output terminals φc1, φc1, φy2 and for moving from φc2 luminance signal Y1, moving image chroma signal C1, still picture luminance signal Y
2 and the chroma signal C2 for still images are configured to be output in parallel and at the same time. Therefore, for a moving image system in the interlaced television (for example, NTSC) standard, output is performed through output terminals φy1 and φc1. Using the motion picture luminance signal Y1 and the motion picture chroma signal C1 that have been generated, a still picture brightness signal Y2 from the output terminals φy2 and φc2 and a still picture system in a standard of a double speed scan system such as an electronic still camera are used. The still image chroma signal C2 can be used, and image signal processing can be separately performed in each system according to each method of interlace and double speed scanning.

Therefore, according to the signal processing circuit of this embodiment, the image signal processing can be applied to the image display system in which the interlaced moving image system and the double speed scan still image system are mixed. The image quality of the image display system can be improved.

Further, in the interlaced moving picture system and the double speed scan still picture system, the common luminance signal processing circuit 8 and the common chroma signal processing circuit 11 can perform a part where the image signal processing can be shared. The entire circuit configuration can be reduced, and the image display system can be efficiently downsized and the power consumption can be reduced.

[0056]

According to the signal processing circuit of the present invention, the output of the information signal corresponding to the standard of the interlace type image display device and the output of the information signal corresponding to the standard of the double speed scan type image display device are simultaneously performed. Therefore, the image signal processing can be applied to an image display system in which an interlaced moving image system and a double-speed scan still image system are mixed, and the image quality of the image display system can be improved. You can

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a signal processing circuit according to an embodiment.

FIG. 2 is a block diagram showing Y-system signal processing of the signal processing circuit according to the present embodiment.

FIG. 3 is a block diagram showing chroma signal processing of the signal processing circuit according to the present embodiment.

FIG. 4 is an explanatory diagram showing vertical aperture control processing according to the present embodiment.

FIG. 5A is a characteristic diagram showing a gamma correction characteristic corresponding to a moving image system. B is a characteristic diagram showing a gamma correction characteristic corresponding to a still image system.

FIG. 6 is an explanatory diagram showing an arrangement of color filters in a CCD solid-state image sensor used in this embodiment.

[Explanation of symbols]

 1 CCD solid-state image sensor 2 Simultaneous processing circuit 3 Apacon processing unit 4 Luminance signal processing unit 5 Chroma signal processing unit 6 Apacon circuit for moving images 7 Apacon circuit for still images 8 Common luminance signal processing circuit 9 Luminance signal processing circuit for moving images 10 Stillness Luminance signal processing circuit for image 11 Common chroma signal processing circuit 12 Chroma signal processing circuit for moving image 10 Chroma signal processing circuit for still image

Claims (1)

[Claims] 1. A common standard for each image display device in an interlace system and a double speed scan system in which scanning is performed at double speed for an image pickup signal from a CCD solid-state image pickup device which reads out all pixels independently. Common luminance signal processing circuit and common chroma signal processing circuit for performing the luminance signal processing and the chroma signal processing described above, and the luminance signal corresponding to the individual standard in the interlaced image display device connected to the subsequent stage of the common luminance signal processing circuit. The first individual luminance signal processing circuit for performing the processing and the second individual luminance signal processing circuit for performing the luminance signal processing corresponding to the individual standard in the image display device of the double speed scan system, and the common chroma signal processing circuit after the common chroma signal processing circuit. Performs chroma signal processing corresponding to individual standards in the connected interlaced image display device One individual chroma signal processing circuit and a second individual chroma signal processing circuit for performing chroma signal processing corresponding to individual standards in a double-speed scan type image display device are provided. From a first luminance signal and a first chroma signal from the first individual chroma signal processing circuit, and a second luminance signal from the second individual luminance signal processing circuit and from the second individual chroma signal processing circuit Signal processing circuit, wherein the second chroma signal of is output in parallel and simultaneously.