KR960002045B1 - Sampling frequency converting method and circuit therefor - Google Patents
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- KR960002045B1 KR960002045B1 KR1019920011629A KR920011629A KR960002045B1 KR 960002045 B1 KR960002045 B1 KR 960002045B1 KR 1019920011629 A KR1019920011629 A KR 1019920011629A KR 920011629 A KR920011629 A KR 920011629A KR 960002045 B1 KR960002045 B1 KR 960002045B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0102—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving the resampling of the incoming video signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/642—Multi-standard receivers
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Abstract
Description
제1도는 본 발명에 따른 색신호용 샘플링 주파수 변환회로.1 is a sampling frequency conversion circuit for color signals according to the present invention.
제2도는 본 발명에 따른 색신호용 샘플링 주파수 변환원리를 설명하기 위한 설명도.2 is an explanatory diagram for explaining the principle of sampling frequency conversion for color signals according to the present invention.
본 발명은 MUSE(Multiple Sub-Nyquist Sampling Encoding)방식의 영상신호를 기존의 TV로 수신하기 위한 신호 변환 처리에 있어서, 변환 처리된 색신호의 공간 해상도의 열하를 개선하기 위한 색신호용 샘플링 주파수 변환방법 및 회로에 관한 것이다.The present invention provides a signal frequency conversion method for color signals for improving the degradation of the spatial resolution of a color signal subjected to conversion in a signal conversion process for receiving a MUSE (Multiple Sub-Nyquist Sampling Encoding) type video signal to a conventional TV. It is about a circuit.
MUSE방식은 차세대 영상매체인 HDTV(High Definition Television)를 실현하기 위해 일본에서 개발된 신호의 전송방식으로 기존의 TV방식이 주사선수가 525 Line/Frame, 2 : 1 인터레이스, 화면 종횡비가 3 : 4인데 비해 주사선수가 1125 Line/Frame, 2 : 1 인터레이스(interace), 화면 종횡비가 9 : 16로서 현행 TV방식과는 신호규격이 서로 상이하다. 현재 상기 MUSE방식에 의한 HDTV의 실험방송이 일본에서 실시되고 있으나 이러한 MUSE방식의 HDTV방송을 수신하기 위한 수신기의 가격이 매우 높아 본격적인 HDTV방송시대를 시작하는데는 어려움이 있다. 따라서 상기 MUSE방식으로 전송되는 HDTV신호를 기존의 NTSC(National Television System Commitee)방식의 TV를 통해서도 수신할 수 있도록 하기 위한 MUSE/NTSC신호변환에 대한 연구가 진행중인데, 이러한 MUSE/NTSC신호변환의 문제점은 상기 MUSE방식에서는 방송위성 1채널 (channel)을 이용한 위성전송을 위해 휘도신호의 대역을 8.1MHz로 압축하며 적색차신호 R-Y, 청색차신호 B-Y는 각각 1/4로 시간축 압축하여 휘도신호의 수평 블랭킹(blanking)기간에 시간축 다중한 후 전송하고 이러한 방법으로 처리된 신호는 MUSE 디코더(DECODER)에서 송신측 영상처리 장치의 역처리 과정에 의해 고화질의 영상을 복원하게 되나 MUSE방식의 전송된 HDTV 영상신호를 기존의 현행 TV로 수신하고자 할 때는 주사선수 변환 및 주파수 변환처리를 통해 현행 TV방식의 신호규격으로 변환시키므로 수직 및 수평 해상도의 저하를 초래하게 된다는 것이다. 특히 색신호의 처리에 있어서는 주사선수 변환 및 4배의 시간축 신장처리에 의해 사선 방향의 윤곽부에 계단모양으로 색신호 성분이 나타나는 화질 저하의 문제점이 있다.MUSE method is a signal transmission method developed in Japan to realize HDTV (High Definition Television), which is the next generation video medium, and the conventional TV method is 525 Line / Frame, 2: 1 interlace, and screen aspect ratio is 3: 4. Compared to the current TV system, the signal type is different from the current TV system because the injection player has 1125 Line / Frame, 2: 1 interlace, and aspect ratio of 9:16. Currently, the experimental broadcast of the HDTV by the MUSE method is being carried out in Japan, but the price of a receiver for receiving the MUSE-type HDTV broadcast is very high, which makes it difficult to start a full-fledged HDTV era. Therefore, research on MUSE / NTSC signal conversion for receiving HDTV signal transmitted by MUSE method through existing NTSC (National Television System Commitee) type TV is in progress, which is a problem of MUSE / NTSC signal conversion. In the MUSE method, the bandwidth of the luminance signal is compressed to 8.1 MHz for satellite transmission using one channel of the broadcast satellite, and the red difference signal RY and blue difference signal BY are time-base compressed to 1/4 each, so that the luminance signal is horizontal. Transmitted after time-base multiplexing in the blanking period, and the signal processed in this way is restored by the MUSE decoder (DECODER) by the reverse processing of the transmitting image processing apparatus, but the transmitted HDTV image of the MUSE method When the signal is to be received by the existing TV, it is converted into the signal standard of the current TV system through the scanning player conversion and the frequency conversion processing. It is that it results in a deterioration of the resolution. In particular, in the processing of the color signal, there is a problem of deterioration in image quality in which the color signal components appear in a stepped shape in the oblique direction by the scanning player transformation and the quadruple time-axis stretching process.
따라서 본 발명의 목적은 상기와 같은 문제점을 해결하기 위하여 주변 화소의 색신호 성분을 이용한 샘플링 주파수를 변환시켜 공간해상도를 향상시키기 위한 색신호용 샘플링 주파수 변환방법을 제공하는 것이다.Accordingly, an object of the present invention is to provide a sampling frequency conversion method for color signals for improving spatial resolution by converting sampling frequencies using color signal components of neighboring pixels in order to solve the above problems.
본 발명의 다른 목적은 상기 색신호용 샘플링 주파수 변환방법을 이용하여 효과적으로 색신호용 샘플링 주파수를 변환시키기 위한 색신호용 샘플링 주파수 변환회로를 제공하는 것이다.Another object of the present invention is to provide a sampling frequency conversion circuit for color signals for effectively converting the sampling frequency for color signals using the sampling frequency conversion method for color signals.
상기 목적을 달성하기 위한 본 발명의 색신호용 샘플링 주파수 변환방법은 입력색신호에 따른 각각의 화소와 화소 사이에 새로운 화소를 만들기 위하여 상기 각각의 화소를 나타내는 2개 이상의 색신호를 연산하여 새로운 색신호를 보간하는 것을 특징으로 한다.In order to achieve the above object, a sampling frequency conversion method for a color signal of the present invention interpolates a new color signal by calculating two or more color signals representing each pixel to make a new pixel between each pixel according to an input color signal. It is characterized by.
상기 다른 목적을 달성하기 위한 본 발명의 색신호용 샘플링 주파수 변환회로는 입력단과 연결되어 입력데이타 샘플링, 지연시키기 위한 지연기, 상기 지연기와 연결되어 지연된 샘플링신호를 소정 크기로 증폭하기 위한 승산기 및 상기 승산기에서 증폭된 소정의 신호들을 연산하기 위한 연산기를 구비한 데이타 보간부와 상기 데이타 보간부로부터의 보간된 데이타를 선택하기 위한 선택부와 상기 데이타 보간부 및 선택부를 제어하기 위한 제어부를 구비하여 이루어지는 것을 특징으로 한다.A sampling frequency conversion circuit for a color signal of the present invention for achieving the above another object is a delay unit connected to an input terminal for sampling and delaying input data, a multiplier for amplifying a delayed sampling signal connected to the delay unit to a predetermined size, and the multiplier. And a control unit for controlling the data interpolation unit and the selection unit for selecting interpolated data from the data interpolation unit, and a data interpolation unit having an operator for calculating predetermined signals amplified by the data interpolation unit. It features.
이하 첨부도면을 참조하여 본 발명을 좀 더 상세하게 설명하고자 한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
제1도는 본 발명에 따른 샘플링 주파수 변환회로이다.1 is a sampling frequency conversion circuit according to the present invention.
제1도를 참조하면, 색신호가 회로의 입력단으로 입력되어 제1, 제2 및 제3지연기(1, 2, 3)의 각각의 입출력단에 위치하며 입력된 원래의 색신호를 d, 제1지연기(1)의 색신호를 c, 제2지연기(2)의 색신호를 b, 제3지연기(3)의 색신호를 a라고 하는 경우, 상기신호 c는 제1승산기(17)에서 8배로 증가되어 선택기(4)의 입력단으로 입력된다.(신호 1) 상기신호 a와 c는 제2연산기(10)에서 연산되고 제2승산기(16)에서 2배 승산된 신호 c와 제1연산기(11)에서 더해지며 제4 및 제5승산기(14, 15)에서 4배 승산된 신호 b와 제7연산기(12)에서 최종적으로 더해진 후 선택기(4)로 입력된다.(신호 2) 또한 상기 제3승산기(13)에서 4배 증가된 신호 c는 제4 및 제5승산기(14, 15)에서 4배 증가된 신호와 b와 제6연산기(9)에서 더해진 선택기(4)로 입력된다.(신호 3) 상기 신호 b와 d는 제3연산기(6)에서 더해지고 제4승산기(14)를 통한 2배 증가된 신호 b와 제4연산기(7)에서 다시 더해지며, 제3승산기(13)를 통해 4배 승산된 신호 c와 최종적으로 더해진 후 선택기(4)로 입력된다.(신호 4) 이때 상기 신호들(신호 1, 2, 3, 4)의 각 승산기에서 승산된 계수의 합은 8비트(bit)를 처리하는 하드웨어의 설계를 용이하게 하기 위해 8이 되도록 한다.Referring to FIG. 1, a color signal is input to an input terminal of a circuit and is positioned at each input / output terminal of each of the first, second, and third delay units 1, 2, and 3, and the original color signal is input to d, first. When the color signal of the delay unit 1 is c, the color signal of the second delay unit 2 is b, and the color signal of the third delay unit 3 is a, the signal c is multiplied by 8 times in the first multiplier 17. The signal a and c are calculated by the second operator 10 and multiplied by twice by the second multiplier 16 and the first operator 11 is input to the input terminal of the selector 4. The signal b multiplied by the fourth and fifth multipliers 14 and 15 and finally multiplied by the seventh operator 12 are added to the selector 4 after being added to the selector 4 (signal 2). The signal c increased four times in the multiplier 13 is input to the signal four times increased in the fourth and fifth multipliers 14 and 15 and the selector 4 added in the b and the sixth operators 9. 3) The signals b and d in the third operator 6 The signal b multiplied by the fourth multiplier 14 and added again in the fourth operator 7, and finally added to the signal c multiplied by the fourth multiplier 13 by the third multiplier 13, and then the selector 4. (Signal 4) In this case, the sum of the coefficients multiplied by each multiplier of the signals (signals 1, 2, 3, and 4) is equal to 8 to facilitate the design of hardware that processes 8 bits. Be sure to
상기신호 1, 2, 3, 4를 입력받은 선택기(4)에서는 각각 1, 2, 3, 4를 제어부(5)로부터 입력되는 제어신호에 의해 입력신호의 주파수에 비해 4배 높은 주파수의 신호를 출력시킨다. 선택기(4)에서 출력된 신호는 제6승산기(18)에 의해 1/8배로 되어 출력단자를 통해 출력되어 진다.In the selector 4 receiving the signals 1, 2, 3, and 4, signals 1, 2, 3, and 4 are four times higher than the frequency of the input signal by a control signal input from the controller 5, respectively. Output it. The signal output from the selector 4 is multiplied by 1/8 times by the sixth multiplier 18 and output through the output terminal.
제2도는 본 발명에 따른 주변화소의 색신호성분을 이용한 색신호용 샘플링 주파수 변환원리를 설명하기 위한 설명도이다.2 is an explanatory diagram for explaining a sampling frequency conversion principle for color signals using color signal components of a peripheral pixel according to the present invention.
제2도를 참조하면, 색신호용 샘플링 주파수 변환회로의 입력단자에 인가되는 화소를 나타내기 위한 색신호와 상기 각각의 색신호 사이의 3개의 화소신호가 보간된 출력을 볼 수 있다.Referring to FIG. 2, a color signal for representing a pixel applied to an input terminal of a sampling frequency conversion circuit for color signals and an output interpolated with three pixel signals between the respective color signals can be seen.
즉 4개의 화소를 나타내는 입력신호를 Sn-1, Sn, Sn+1, Sn+2(제1도에서는 a, b, c, d)라하면 이중 상기 제1도의 각 승산기의 승산계수를 다르게 하여 상기 색신호 Sn-1을 1배, Sn을 4배, Sn+1을 3배로 승산한 후 가산하고 이 가산된 신호를 다시 1/8배하여 제1신호를 형성하고, 상기 색신호 Sn과 Sn+1을 각각 4배로 승산한 후 가산하고 이 가산된 신호를 다시 1/8배하여 제2신호를 형성하며, 상기 색신호 Sn을 3배, Sn+1을 4배, Sn+1을 1배로 승산한 후 가산하고 이 가산한 신호를 다시 1/8배하여 제3신호를 형성함으로써 상기 Sn과 Sn+1사이에 3개의 색신호를 형성한다. 이때 상기 승산계수의 크기는 상기 색신호성분과의 상관관계 즉 화소의 거리에 따라 거리가 가까울수록 크다.In other words, if an input signal representing four pixels is S n-1 , S n , S n + 1 , S n + 2 (a, b, c, d in FIG. 1), the multipliers of the multipliers of FIG. By multiplying the color signal S n-1 by 1 times, S n by 4 times, and S n + 1 by 3 times with different coefficients, the sum is added and the summed signal is increased by 1/8 times to form a first signal. The color signals S n and S n + 1 are multiplied by 4 times, respectively, and then added, and the added signals are further increased by 1/8 times to form a second signal. The color signals S n are tripled and S n + 1 is 4 times. By multiplying Sn + 1 by a factor of 1, the sum is added and the summed signal is then multiplied by 1/8 to form a third signal, thereby forming three color signals between S n and S n + 1 . At this time, the magnitude of the multiplication factor is larger as the distance gets closer to the correlation with the color signal component, that is, the distance of the pixel.
따라서 본 발명에 따른 색신호용 샘플링 주파수 변환회로는, 주변 화소의 색신호성분을 이용하여 주사선수변환 및 4배의 시간축 신장처리에 의해 복원된 영상의 사선 윤곽부에 나타나는 색신호 비직선성에 의한 화질열화 요인을 제거함으로써 색신호의 공간해상도를 향상시켜 MUSE(Multiple Sub-Nyquist Sampling Encoding)방식의 영상신호를 화질의 열화 없이 기존의 TV로 수신할 수 있다.Therefore, in the color signal sampling frequency converting circuit according to the present invention, image quality deterioration factors due to color signal nonlinearity appearing in the diagonal contour portion of the image reconstructed by scanning bow transformation and quadruple time-axis stretching using the color signal components of the surrounding pixels. The spatial resolution of the color signal can be improved to remove the MUSE (Multiple Sub-Nyquist Sampling Encoding) video signal from the existing TV without deterioration of image quality.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019920011629A KR960002045B1 (en) | 1992-06-30 | 1992-06-30 | Sampling frequency converting method and circuit therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019920011629A KR960002045B1 (en) | 1992-06-30 | 1992-06-30 | Sampling frequency converting method and circuit therefor |
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| KR940001743A KR940001743A (en) | 1994-01-11 |
| KR960002045B1 true KR960002045B1 (en) | 1996-02-09 |
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| KR1019920011629A KR960002045B1 (en) | 1992-06-30 | 1992-06-30 | Sampling frequency converting method and circuit therefor |
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