JPH0846926A - Video signal processing device - Google Patents

Abstract

(57) [Summary] [Object] The present invention performs a vertical edge enhancement process including a non-linear process on a main screen luminance signal by performing a decoding process to reduce a mismatch of frequency characteristics of a main screen luminance signal on an encoding side and a decoding side. It is an object of the present invention to provide a video signal processing device that does not cause image quality deterioration even if the above is performed. A video signal transmitted by a first television system subjected to vertical compression processing and a video signal transmitted by a second television system not subjected to vertical compression processing are selectively input, A video signal processing device that decodes each input video signal separates a luminance signal, a color signal, and a vertical contour component from the input video signal, and determines the television system of the input video signal. Based on the discrimination result of the discriminating means, the emphasis amount of the separated vertical contour component is changed and added to the luminance signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides, for example, a television signal corresponding to a current screen having an aspect ratio of 4: 3 and a television signal corresponding to a horizontally long screen having an aspect ratio of 16: 9. : Input and play back the television signal converted to correspond to the current screen of 3.
The present invention relates to an improvement of a video signal processing device that performs processing so as to selectively display an image on the same screen.

[0002]

As is well known, the aspect ratio is 16: 9.
When a picture is taken on a horizontally long screen and the image pickup signal is displayed on a screen with an aspect ratio of 4: 3 on a current television receiver, the circularity is not maintained and, for example, a circular subject becomes a vertically long ellipse. . Therefore, conventionally, in order to achieve compatibility between the horizontal television system and the current television system, on the transmitting side, the horizontal television signal is vertically compressed to 3/4 times and transmitted, thereby transmitting a perfect circle. Second-generation ED, a new transmission and reception system that maintains the rate
A TV (Extended Definition Television) system has been developed.

In this new transmission / reception system, since a horizontal television signal is subjected to vertical compression processing, on the screen of the current television receiver, the main picture portion is displayed in the central portion of the screen and there is no upper and lower portions of the screen. Since the image part is displayed, it is called the letterbox method. In this letterbox method, in order to reproduce a high-definition image when displaying an image on a horizontally long screen television receiver, the components missing due to the vertical compression process are multiplexed in the non-image parts at the top and bottom of the screen. I have to.

FIG. 5 shows a second generation EDTV system encoding apparatus for converting a landscape television signal into a current television signal. That is, the input terminals 11, 1
2, the aspect ratio is 16: 9, the number of scanning lines is 480, and the luminance signal Y and the color signal C of progressive scanning are supplied to each of them. Of these, the luminance signal Y supplied to the input terminal 11 is supplied to a vertical LPF (low-pass filter) 13 to extract a vertical low-frequency component and a vertical HPF.
It is supplied to the (high-pass filter) 14 to extract the vertical high frequency components.

Here, the vertical low frequency component extracted by the vertical LPF 13 is supplied to the scanning line number conversion circuit 15. The scanning line number conversion circuit 15 generates a main screen luminance signal of interlaced scanning with 360 scanning lines by subjecting the input vertical low frequency component to vertical compression processing of 3/4 times, and The compensation signal VT of the vertical time component of the interlaced scanning is generated with 240 scanning lines, which is generated when the sequential scanning is converted to the interlaced scanning.

The vertical high frequency component extracted by the vertical HPF 14 is a component missing from the original luminance signal Y for vertical compression processing of the luminance signal Y, and is supplied to the scanning line number conversion circuit 16. This scanning line number conversion circuit 16
The input vertical high-frequency component is subjected to a vertical compression process of 1/2 to generate an interlaced scanning compensation signal VH with 240 scanning lines. Then, the compensation signal V output from each of the scanning line number conversion circuits 15 and 16
T and VH are added by the arithmetic circuit 17 to form a compensation signal.

On the other hand, the color signal C supplied to the input terminal 12 is supplied to the scanning line number conversion circuit 18. This scanning line number conversion circuit 18 is 3/3 for the input color signal C.
By performing vertical compression processing four times, a main screen color signal having 360 scanning lines is generated. Then, the main screen color signal output from the scanning line number conversion circuit 18 is the arithmetic circuit 1
9 is multiplexed with the main screen luminance signal output from the scanning line number conversion circuit 15. Therefore, the arithmetic circuit 19 outputs a composite video signal of the current television system, which can be reproduced by the current television receiver.

Further, the main screen luminance signal output from the scanning line number conversion circuit 15 is supplied to the vertical processing circuit 20. The vertical processing circuit 20 extracts a vertical high-frequency component from the input main screen luminance signal, frequency-converts the vertical high-frequency component to a low frequency, and then performs vertical compression processing to 2/3 times to perform scanning. A signal having 240 lines is generated. Then, the output signal of this vertical processing circuit 20 becomes
1 subtracts from the compensation signal output from the arithmetic circuit 17 to generate a compensation signal that does not affect the screen.

That is, the vertical high frequency component of the main screen luminance signal output from the vertical processing circuit 20 is subtracted from the compensation signal output from the arithmetic circuit 17 to reduce the amount of information as an attenuation compensation signal. It is designed to reduce interference with the upper and lower non-image areas when received by a television receiver.

The attenuation compensation signal output from the arithmetic circuit 21 is supplied to the compression processing circuit 22. This compression processing circuit 22 halves the input attenuation compensation signal.
The signal is converted into a signal having 120 scanning lines by performing a double vertical compression process, and 60 signals are distributed to the upper and lower non-image areas. After that, the 60 attenuation compensation signals corresponding to the upper and lower non-picture areas output from the compression processing circuit 22 are multiplexed by the arithmetic circuit 23 with the current television composite video signal output from the arithmetic circuit 19. As a result, the second generation EDTV signal obtained by converting the horizontal television signal into the current television signal is generated and taken out from the output terminal 24.

Next, FIG. 6 shows the above-mentioned second generation EDTV.
The corresponding decoding device is shown. That is, the input terminal 25 is selectively supplied with the second-generation EDTV signal in which the attenuation compensation signal is multiplexed with the composite video signal described above and the current television signal as input signals. The input signal supplied to the input terminal 25 is the Y / C separation circuit 2
6, supplied to the expansion processing circuit 27 and the system discrimination circuit 28, respectively. Of these, the Y / C separation circuit 26 separates the main screen luminance signal and the main screen color signal from the composite video signal included in the input signal and extracts the vertical contour component.

In this case, the vertical contour component is supplied to the vertical contour emphasizing circuit 29 to control the amount of the vertical contour component, and then supplied to the arithmetic circuit 30. This arithmetic circuit 30
A main screen luminance signal output from the Y / C separation circuit 26,
By adding the vertical contour component output from the vertical contour emphasis circuit 29, the vertical contour of the main screen luminance signal is emphasized.

Further, the decompression processing circuit 27 carries out a processing reverse to that of the compression processing circuit 22 used in the encoding apparatus shown in FIG. 5, and doubles the attenuation compensation signal included in the input signal. The number of scanning lines is returned to 240 by performing the vertical extension processing of. Further, the main screen luminance signal output from the arithmetic circuit 30 is the vertical processing circuit 3.
1 is supplied. Similar to the vertical processing circuit 20 shown in FIG. 5, the vertical processing circuit 31 extracts a vertical high frequency component from the input main screen luminance signal and frequency-converts the vertical high frequency component into a low frequency band, A signal of 240 scanning lines is generated by performing vertical compression processing to 2/3 times.

The output signal of the vertical processing circuit 31 is added to the attenuation compensation signal output from the expansion processing circuit 27 by the arithmetic circuit 32, so that the original compensation signal is reproduced. This compensation signal is supplied to the VT demodulation circuit 33 and the compensation signal VT is demodulated.
Is added to the main screen luminance signal output from the arithmetic circuit 30 by the arithmetic circuit 34. After that, the output signal of the arithmetic circuit 34 is supplied to the scanning line number conversion circuit 35. The scanning line number conversion circuit 35 is 4 / for the input signal.
By subjecting the image to vertical expansion processing three times, a main screen luminance signal with 480 scanning lines is generated.

The compensation signal output from the arithmetic circuit 32 is supplied to the VH demodulation circuit 36 to demodulate the compensation signal VH, and the compensation signal VH is supplied to the scanning line number conversion circuit 37. The scanning line number conversion circuit 37 generates a compensation signal VH having 480 scanning lines by subjecting the input compensation signal VH to a vertical expansion process twice.
Then, by the arithmetic circuit 38 adding the compensation signal VH output from the scanning line number conversion circuit 37 to the main screen luminance signal output from the scanning line number conversion circuit 35,
A high-definition luminance signal Y is generated and taken out from the output terminal 39.

On the other hand, the main screen color signal separated by the Y / C separation circuit 26 is supplied to a color demodulation circuit 40, subjected to color demodulation processing, and then supplied to a scanning line number conversion circuit 41. The scanning line number conversion circuit 41 generates a color signal C having 480 scanning lines by applying vertical expansion processing to the input color demodulation signal by 4/3 times, and outputs the color signal C to the output terminal 42. ing.

In the VT demodulation circuit 33, the VH demodulation circuit 36, and the scanning line number conversion circuits 35, 41, the second generation EDTV signal is input to the input terminal 2 by the system discrimination circuit 28.
Only when it is determined that the signal is supplied to the No. 5, the above-described demodulation operation and scanning line number conversion operation are performed. That is, when it is determined by the system determination circuit 28 that the current television signal is supplied to the input terminal 25,
The VT demodulation circuit 33 and the VH demodulation circuit 36 are in a non-operating state, and the scanning line number conversion circuits 35 and 41 operate so as to output the input signal as they are.

As described above, the second generation EDTV
In the system, in order to maintain compatibility with current television signals, the encoding device uses a vertical process to reduce the number of scanning lines to four.
In addition to converting from 80 lines to 360 lines, the attenuation compensation signal is generated by utilizing the correlation between the main screen luminance signal and the compensation signal in order to reduce the interference to the upper and lower non-image areas. Therefore, in the decoding device, the compensation signal is reproduced from the main screen luminance signal and the attenuation compensation signal, and the number of scanning lines is converted from 360 to 480 by vertical processing.

As described above, in a system that uses the correlation between the main screen luminance signal and the compensation signal by performing vertical compression and expansion processing, the frequency characteristics of the processing circuits of the encoding device and the decoding device may be the same. Would be desirable. Further, the current television signal decoding device also performs vertical contour enhancement for the purpose of improving image quality.

Next, the vertical contour enhancement will be described. FIG. 7 shows the Y / C separation circuit 26 and the vertical contour enhancement circuit 2 described above.
9 shows the details of 9. In general, a line memory is required to extract the vertical contour component, but it is assumed that the line memory is also used by the Y / C separation circuit 26. That is, the composite video signal supplied to the input terminal 43 is 1H (horizontal scanning period) by the two line memories 44 and 45 connected in series.
It is delayed one by one.

The composite video signal supplied to the input terminal 43, the 1H-delayed composite video signal obtained from the line memory 44, and the 2H-delayed composite video signal obtained from the line memory 45 are supplied to the coefficient multiplication circuit 46, 47,4
8 to supply -1/4 times, 1/2 times and -1 respectively.
After being multiplied by / 4, it is added by the arithmetic circuit 49. The output of the arithmetic circuit 49 is a vertical high frequency component of the composite video signal, and includes a main screen color signal and a vertical contour component.

The vertical high-frequency component of the composite video signal output from the arithmetic circuit 49 is supplied to a horizontal BPF (bandpass filter) 50 so that the main screen color signal is extracted and taken out from the output terminal 51. . In addition, the composite video signal obtained from the line memory 44 is the arithmetic circuit 52.
As a result, the main screen luminance signal is generated by subtracting the main screen color signal output from the horizontal BPF 50, and the Y / C separation processing is realized here.

Next, the vertical high frequency component of the composite video signal output from the arithmetic circuit 49 is supplied to the vertical contour emphasis circuit 29 including the horizontal LPF 53, the non-linear circuit 54 and the gain adjusting circuit 55. First, the horizontal LPF 53 extracts a vertical contour component from the input vertical high frequency component. The extracted vertical contour component is supplied to the non-linear circuit 54 and subjected to non-linear processing such as removal of a small amplitude component which is a noise component of the image and painting of the image.

The output signal of the non-linear circuit 54 is generally supplied to a gain adjusting circuit 55, which allows the user to change the gain according to his or her preference, and the level is adjusted. As a result, the amount of vertical contour enhancement is controlled. It After that, the output signal of the gain adjusting circuit 55 is changed to the arithmetic circuit 30.
As a result, it is added to the main screen luminance signal output from the arithmetic circuit 52 and taken out from the output terminal 56, where the vertical contour enhancement processing for the main screen luminance signal is realized. Thus, in the vertical contour enhancement circuit 29, the nonlinear circuit 54
The gain adjusting circuit 55 and the like perform a process of changing the frequency characteristic of the main screen luminance signal.

However, the second generation ED as described above
In a conventional decoding device compatible with TV signals, when decoding a composite video signal generated by a main screen luminance signal and a main screen color signal and a compensation signal multiplexed in upper and lower non-image parts,
Since the vertical contour enhancement processing including the non-linear processing is performed, the frequency characteristics of the main screen luminance signal reproduced by the decoding device and the main screen luminance signal generated by the encoding device do not match. Therefore, when the compensation signal is reproduced from the main screen luminance signal with the vertical contour enhancement and the attenuation compensation signal, there arises a problem that the image quality is deteriorated.

[0026]

As described above, in the conventional decoding device, since the main screen luminance signal is subjected to the vertical contour enhancement processing including the non-linear processing, the reproduced main screen luminance signal and the encoding side are If the frequency characteristics of the generated main screen luminance signal do not match and the compensation signal is reproduced from the vertical contour emphasized main screen luminance signal and the attenuation compensation signal, there is a problem that image quality is deteriorated.

Therefore, the present invention has been made in consideration of the above circumstances, and performs a decoding process for reducing the mismatch of the frequency characteristics of the main screen luminance signal on the encoding side and the decoding side, and performs a nonlinear process on the main screen luminance signal. It is an object of the present invention to provide a very good video signal processing device that does not cause image quality deterioration even if vertical contour enhancement processing including is performed.

[0028]

A video signal processing device according to the present invention provides a composite video signal subjected to vertical compression processing,
A video signal transmitted by the first television system in which a compensation signal corresponding to a component missing by the vertical compression processing is multiplexed, and a composite video signal not subjected to the vertical compression processing are transmitted by the second video signal.
The video signal transmitted by the television system is selectively input, and a decoding process is applied to each input video signal. Then, a separating means for separating a luminance signal, a color signal and a vertical contour component from the input video signal, a determining means for determining the television system of the input video signal, and a determination result of this determining means, A control means for varying the emphasis amount of the vertical contour component separated by the separation means and adding it to the luminance signal is provided.

The video signal processing apparatus according to the present invention multiplexes the composite video signal subjected to the vertical compression processing with the attenuation compensation signal corresponding to the compensation signal for compensating the component missing by the vertical compression processing. The video signal transmitted by the first television system and the composite video signal not subjected to the vertical compression process by the second television system are selectively input, and the respective input signals are input. It is intended for those that perform decoding processing on the generated video signal.

Then, a separation means for separating the luminance signal and the chrominance signal from the inputted video signal, and a compensation signal for generating a compensation signal from the luminance signal and the attenuation compensation signal contained in the video signal separated by this separation means. Generating means, and a luminance signal generating means for generating an original luminance signal by subjecting the compensation signal generated by the compensation signal generating means and the luminance signal separated by the separating means to vertical expansion processing and adding respectively. A vertical contour enhancing means for subjecting the luminance signal output from the luminance signal generating means to a vertical contour enhancing process is provided.

Further, in the video signal processing apparatus according to the present invention, in the above object, a separating means for separating the luminance signal and the chrominance signal from the inputted video signal, and the luminance signal and the video signal separated by this separating means. A compensating signal generating means for generating a compensating signal from the attenuation compensating signal included in the first compensating signal, a first vertical decompressing means for vertically compensating the compensating signal generated by the compensating signal generating means, and a separating means Second vertical extension means for performing vertical extension processing on the generated luminance signal, vertical contour enhancement means for performing vertical edge enhancement processing on the luminance signal output from the second vertical extension means, and this vertical The luminance signal output from the contour emphasizing means and the compensation signal output from the first vertical expansion means are added to obtain an original luminance signal.

[0032]

According to the above construction, when the input video signal is the first television system, the vertical contour component is prevented from being added to the luminance signal based on the discrimination result of the system discrimination means. Thus, it is possible to control so that the vertical contour enhancement process, which is a non-linear process, is not performed, so that the frequency characteristic of the luminance signal can be matched with the frequency characteristic of the luminance signal generated on the encoding side. Therefore, since a faithful compensation signal can be obtained, a high-definition image without image quality deterioration can be obtained.

Further, the original luminance signal is obtained by subjecting the generated compensation signal generated by the compensation signal generating means and the separated luminance signal separated by the separating means to vertical expansion processing and adding them respectively. Since the vertical contour enhancement processing is performed on the generated luminance signal, the inconsistency of the frequency characteristics of the luminance signal on the encoding side and the decoding side is eliminated, and a high-definition image without image quality deterioration is generated. You will be able to get it.

Further, the compensating signal generated by the compensating signal generating means is subjected to vertical expansion processing, and the luminance signal separated by the separating means is also subjected to vertical expansion processing. After the vertical contour enhancement processing was performed on the above, the original luminance signal was obtained by adding the compensation signal subjected to the vertical expansion processing. Therefore, again, the frequency characteristics of the luminance signal on the encoding side and the decoding side do not match. It becomes possible to obtain a high-definition image without deterioration of image quality.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1, the same parts as those in FIG. 6 are designated by the same reference numerals, and a second generation EDTV signal or a current television signal is selectively supplied as an input signal to the input terminal 25. The input signal supplied to the input terminal 25 is supplied to the Y / C separation circuit 26, the expansion processing circuit 27, and the method discrimination circuit 28, respectively.

Of these, the Y / C separation circuit 26 separates the main screen luminance signal and the main screen color signal from the composite video signal included in the input signal and extracts the vertical contour component. Further, the expansion processing circuit 27 restores the number of scanning lines to 240 by performing twice the vertical expansion processing on the attenuation compensation signal included in the input signal. Further, the system discriminating circuit 28 discriminates whether the input signal is the second generation EDTV system or the current television system, and the VT demodulating circuit 33, the VH demodulating circuit 36 and the scanning line number converting circuit 35, depending on the discriminating result. 41 is controlled.

First, when the input signal supplied to the input terminal 25 is the second-generation EDTV signal, the signals of the upper and lower non-picture portions are attenuation compensation signals and are supplied to the expansion processing circuit 27.
Also, in the main screen section, the input signal is a composite video signal,
By being supplied to the Y / C separation circuit 26, the main screen luminance signal and the main screen color signal are separated, and the vertical contour component is extracted. This vertical contour component is supplied to the vertical contour enhancement circuit 29.

Here, FIG. 2 shows the Y / C separation circuit 26.
2 shows the details of the vertical contour emphasizing circuit 29, and the same parts as those in FIG. 7 are denoted by the same reference numerals. That is, the output of the arithmetic circuit 49 is a vertical high frequency component of the composite video signal and includes the main screen color signal and the vertical contour component. The vertical high frequency component of the composite video signal output from the arithmetic circuit 49 is supplied to the vertical contour emphasis circuit 29 including the horizontal LPF 53, the non-linear circuit 54, and the gain adjusting circuit 55.

First, the horizontal LPF 53 extracts vertical contour components from the input vertical high frequency components. The extracted vertical contour component is supplied to the non-linear circuit 54 and subjected to non-linear processing such as removal of a small amplitude component which is a noise component of the image and painting of the image. Then, the vertical contour component subjected to the non-linear processing by the non-linear circuit 54 is supplied to the gain adjusting circuit 55 and the level thereof is adjusted to control the emphasis amount of the contour correction.

In this case, the system adjustment signal output from the system determination circuit 28 is supplied to the gain adjustment circuit 55 via the input terminal 57, and the gain adjustment circuit 55 is supplied.
Can control the emphasis amount of the contour correction for the vertical contour component also by this system discrimination signal. Then, the contour correction enhancement signal output from the vertical contour enhancement circuit 29 is added to the main screen luminance signal supplied to the arithmetic circuit 30 and output from the Y / C separation circuit 26.

By the way, in the above description, since it is assumed that the input signal supplied to the input terminal 25 is the second generation EDTV signal, the gain adjusting circuit 55 outputs the first signal output from the system discriminating circuit 28. The system discrimination signal indicating that the signal is a second generation EDTV signal is supplied through the input terminal 57. At this time, the gain adjustment circuit 55
The amount of enhancement is set to "0" and control is performed so that contour enhancement is not performed. Therefore, the main circuit luminance signal output from the Y / C separation circuit 26 is output from the arithmetic circuit 30 as it is.

The main screen luminance signal output from the arithmetic circuit 30 is supplied to the vertical processing circuit 31. The vertical processing circuit 31 corresponds to the vertical processing circuit 20 shown in FIG.
Similarly, the vertical high frequency component is extracted from the input main screen luminance signal, the vertical high frequency component is frequency-converted to the low frequency range, and then the vertical compression process is performed to 2/3 times to obtain 24 scanning lines.
0 signals are generated.

The output signal of the vertical processing circuit 31 is added to the attenuation compensation signal output from the expansion processing circuit 27 by the arithmetic circuit 32, so that the original compensation signal is reproduced. This compensation signal is supplied to the VT demodulation circuit 33 and the compensation signal VT is demodulated.
Is added to the main screen luminance signal output from the arithmetic circuit 30 by the arithmetic circuit 34. After that, the output signal of the arithmetic circuit 34 is supplied to the scanning line number conversion circuit 35. The scanning line number conversion circuit 35 is 4 / for the input signal.
By subjecting the image to vertical expansion processing three times, a main screen luminance signal with 480 scanning lines is generated.

The compensation signal output from the arithmetic circuit 32 is supplied to the VH demodulation circuit 36 to demodulate the compensation signal VH, and the compensation signal VH is supplied to the scanning line number conversion circuit 37. The scanning line number conversion circuit 37 generates a compensation signal VH having 480 scanning lines by subjecting the input compensation signal VH to a vertical expansion process twice.
Then, by the arithmetic circuit 38 adding the compensation signal VH output from the scanning line number conversion circuit 37 to the main screen luminance signal output from the scanning line number conversion circuit 35,
A high-definition luminance signal Y is generated and taken out from the output terminal 39.

On the other hand, the main screen color signal separated by the Y / C separation circuit 26 is supplied to the color demodulation circuit 40, subjected to color demodulation processing, and then supplied to the scanning line number conversion circuit 41. The scanning line number conversion circuit 41 generates a color signal C having 480 scanning lines by applying vertical expansion processing to the input color demodulation signal by 4/3 times, and outputs the color signal C to the output terminal 42. ing.

As described above, when the input signal supplied to the input terminal 25 is the second generation EDTV signal, the vertical contour enhancement processing, which is a non-linear processing, is performed based on the system discrimination signal output from the system discrimination circuit 28. The frequency characteristic of the main screen luminance signal output from the arithmetic circuit 30 can be matched with the frequency characteristic of the main screen luminance signal generated on the encoding side. For this reason,
Since a faithful compensation signal can be obtained from the arithmetic circuit 32, a high-definition image without image quality deterioration can be obtained.

Next, when the input signal supplied to the input terminal 25 is the current television signal, there is no distinction between the upper and lower non-picture areas and the main picture area, and all are treated as the main screen. That is, when the system discrimination signal indicating the current television signal is output from the system discrimination circuit 28, the scanning line number conversion circuits 35 and 41 operate so as to output the input signal as it is. Further, the VT demodulation circuit 33 enters a non-operating state in which no demodulation operation is performed, and the output becomes "0". Therefore, from the arithmetic circuit 34, the arithmetic circuit 30
The main-screen luminance signal output from is output as it is.

Further, the VH demodulation circuit 36 is also in the non-operation state in which the demodulation operation is not performed, and the output becomes "0". Therefore, the output of the scanning line number conversion circuit 37 also becomes “0”, and the brightness signal output from the scanning line number conversion circuit 35 is directly output from the arithmetic circuit 38.

Further, to the gain adjusting circuit 55 of the vertical contour emphasizing circuit 29, a system discrimination signal indicating that it is the current television signal output from the system discrimination circuit 28 is supplied via the input terminal 57. . At this time, the gain adjustment circuit 55 executes the contour enhancement operation on the input vertical contour component, and the output contour correction enhancement signal is the main screen luminance signal output from the Y / C separation circuit 26 by the arithmetic circuit 30. Is added to perform vertical contour enhancement processing.

As described above, when the input signal supplied to the input terminal 25 is the current television signal, based on the system discriminating signal output from the system discriminating circuit 28, the V
The decoding process for the second generation EDTV signal by the T demodulation circuit 33, the VH demodulation circuit 36, and the scanning line number conversion circuits 35, 41 is stopped, and the vertical contour enhancement process is applied to the main screen luminance signal to improve the image quality. Will be done.

Next, FIG. 3 shows a second embodiment of the present invention. When the same parts as those in FIG. It is arranged to control the operation of the scanning line number converting circuit 37 based on the system discriminating signal output from the system discriminating circuit 28. In this case, the scanning line number conversion circuit 37 executes the above-described scanning line number conversion processing when the system discrimination signal indicating the second generation EDTV signal is supplied, and indicates that it is the current television signal. When the system discrimination signal is supplied, switching control is performed so that the input signal is output as it is.

That is, in the case of the second embodiment, the line memory used for the vertical contour emphasis circuit 29 is set to Y /
Second generation ED, not shared with C separation circuit 26
A line memory is newly provided after the TV signal decoding process to execute the vertical contour enhancement process.
Therefore, since the compensation signal can be reproduced faithfully without changing the frequency characteristic of the main screen luminance signal in the decoding process of the second generation EDTV signal, the number of scanning lines is 48.
It becomes possible to perform vertical contour enhancement processing on a high-definition image made up of zero lines, regardless of whether the input signal supplied to the input terminal 25 is the second generation EDTV signal or the current television signal. , Vertical contour enhancement processing can be performed.

Next, FIG. 4 shows a third embodiment of the present invention. When the same parts as those in FIG. 1 are designated by the same reference numerals, the vertical contour emphasizing circuit 29 and the scanning line number converting circuit 35 will be described. And the arithmetic circuit 38.
Therefore, the frequency characteristic of the main screen luminance signal input to the vertical processing circuit 31 becomes the same as that on the encoding side, and the original compensation signal can be faithfully obtained from the arithmetic circuit 32.

Further, the compensation signal VH output from the VH demodulation circuit 36 is a vertical high frequency component which is missing when the encoding side vertically compresses the number of scanning lines of the main screen luminance signal from 480 to 360. is there. Therefore, the VH demodulation circuit 36 can perform the vertical high frequency compensation by adjusting the gain when performing the demodulation process of the compensation signal VH, and the same effect as the vertical contour enhancement process described above can be obtained.

Further, the vertical contour enhancement circuit 29 carries out vertical contour correction on the main screen luminance signal which is the output signal of the scanning line number conversion circuit 35. Therefore, it is possible to combine the vertical contour enhancement characteristics of the VH demodulation circuit 36 and the vertical contour enhancement circuit 29. If the vertical contour emphasizing circuit 29 does not perform the non-linear processing, the vertical contour emphasizing processing can be performed by convolving the coefficient of the vertical contour correction with the coefficient of the vertical filter used in the scanning line number converting circuit 35. This means that the arithmetic circuit 3
This is the same as performing vertical contour enhancement processing on the main screen luminance signal having 360 scanning lines output from No. 4.
The present invention is not limited to the above-described embodiments, but can be variously modified and implemented without departing from the scope of the invention.

[0056]

As described above in detail, according to the present invention,
Decoding processing is performed to reduce the mismatch of the frequency characteristics of the main screen luminance signal between the encoding side and the decoding side, and even if vertical contour enhancement processing including non-linear processing is performed on the main screen luminance signal, it does not cause image quality deterioration. It is possible to provide a video signal processing device.

[Brief description of drawings]

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

FIG. 2 is a block configuration diagram showing details of a Y / C separation circuit and a vertical contour emphasis circuit in the embodiment.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a block configuration diagram showing a third embodiment of the present invention.

FIG. 5 is a block configuration diagram showing a second generation EDTV system encoding device.

FIG. 6 is a block configuration diagram showing a conventional decoding device compatible with the second generation EDTV system.

FIG. 7 is a block configuration diagram showing details of a Y / C separation circuit and a vertical contour emphasis circuit in the conventional apparatus.

[Explanation of symbols]

11, 12 ... Input terminal, 13 ... Vertical LPF, 14 ... Vertical HPF, 15, 16 ... Scan line number conversion circuit, 17 ... Operation circuit, 18 ... Scan line number conversion circuit, 19 ... Operation circuit, 20 ...
Vertical processing circuit, 21 ... Arithmetic circuit, 22 ... Compression processing circuit,
23 ... Arithmetic circuit, 24 ... Output terminal, 25 ... Input terminal, 2
6 ... Y / C separation circuit, 27 ... Decompression processing circuit, 28 ... System discrimination circuit, 29 ... Vertical contour emphasis circuit, 30 ... Arithmetic circuit,
31 ... Vertical processing circuit, 32 ... Operation circuit, 33 ... VT demodulation circuit, 34 ... Operation circuit, 35 ... Scan line number conversion circuit, 36
... VH demodulation circuit, 37 ... Scan line number conversion circuit, 38 ... Arithmetic circuit, 39 ... Output terminal, 40 ... Color demodulation circuit, 41 ... Scan line number conversion circuit, 42 ... Output terminal, 43 ... Input terminal, 4
4, 45 ... Line memory, 46-48 ... Coefficient multiplication circuit,
49 ... Arithmetic circuit, 50 ... Horizontal BPF, 51 ... Output terminal,
52 ... Arithmetic circuit, 53 ... Horizontal LPF, 54 ... Non-linear circuit, 55 ... Gain adjusting circuit, 56 ... Output terminal, 57 ... Input terminal.

Claims (5)

[Claims] 1. A video signal transmitted according to a first television system, wherein a composite video signal subjected to vertical compression processing is multiplexed with a compensation signal corresponding to a component missing due to the vertical compression processing; In a video signal processing device, to which a composite video signal not subjected to vertical compression processing and a video signal transmitted by a second television system are selectively input, and decoding processing is applied to each input video signal. A separating means for separating a luminance signal, a color signal and a vertical contour component from an input video signal, a determining means for determining a television system of the input video signal, and a determination result of the determining means, A video signal processing device, comprising: a control means for varying the enhancement amount of the vertical contour component separated by the separation means and adding it to the luminance signal. 2. The control means controls the vertical contour component so as not to be added to the luminance signal when the determination means determines that the television system is the first television system. The video signal processing device according to claim 1. 3. The control means controls the enhancement amount of the vertical contour component to be minimum when the determination means determines that the television system is the first television system. The video signal processing device according to claim 1. 4. A first television system wherein a composite video signal subjected to vertical compression processing is multiplexed with an attenuation compensation signal corresponding to a compensation signal for compensating for a component missing by the vertical compression processing. A video signal to be transmitted and a video signal obtained by transmitting the composite video signal that has not been subjected to the vertical compression processing by the second television system are selectively input, and the input video signal is decoded. In a video signal processing device for processing, a separating means for separating a luminance signal and a chrominance signal from an inputted video signal, and the luminance signal and the attenuation compensation signal included in the video signal separated by the separating means are used. Compensation signal generation means for generating the compensation signal, and vertical extension for the compensation signal generated by the compensation signal generation means and the luminance signal separated by the separation means, respectively. A luminance signal generating means for generating an original luminance signal by performing the tension processing and adding; and a vertical contour enhancing means for subjecting the luminance signal output from the luminance signal generating means to a vertical contour enhancing processing. A video signal processing device characterized in that 5. A first television system in which a composite video signal subjected to vertical compression processing is multiplexed with an attenuation compensation signal corresponding to a compensation signal for compensating for a component missing by the vertical compression processing. A video signal to be transmitted and a video signal obtained by transmitting the composite video signal that has not been subjected to the vertical compression processing by the second television system are selectively input, and the input video signal is decoded. In a video signal processing device for processing, a separating means for separating a luminance signal and a chrominance signal from an inputted video signal, and the luminance signal and the attenuation compensation signal included in the video signal separated by the separating means are used. Compensation signal generation means for generating the compensation signal, first vertical extension means for subjecting the compensation signal generated by the compensation signal generation means to vertical extension processing, and the separation means. Second vertical expansion means for performing vertical expansion processing on the separated luminance signal;
Vertical contour enhancing means for performing vertical contour enhancing processing on the luminance signal output from the vertical extending means, the luminance signal output from the vertical contour enhancing means, and the compensation output from the first vertical extending means. An image signal processing apparatus comprising: an addition unit that adds the signal to obtain an original luminance signal.