KR960013552B1 - Interpolation circuit of a composite video signal - Google Patents

Interpolation circuit of a composite video signal Download PDF

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KR960013552B1
KR960013552B1 KR1019890001135A KR890001135A KR960013552B1 KR 960013552 B1 KR960013552 B1 KR 960013552B1 KR 1019890001135 A KR1019890001135 A KR 1019890001135A KR 890001135 A KR890001135 A KR 890001135A KR 960013552 B1 KR960013552 B1 KR 960013552B1
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signal
chroma
multiplier
interpolation
output
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KR900012496A (en
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박만호
이호웅
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엘지전자 주식회사
구자홍
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/455—Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals

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Abstract

a frame comb filter(101) separating a chroma signal(CF) through the arithmetic operation of adders(18a,18b) and multipliers(19a,19b); a line comb filter(102) separating a chroma signal(CH) through the arithmetic operation of an adder(31) and a multiplier(32) after passing a line memory(30); a luminance signal outputting part(103) outputting a luminance signal(Yout) through adders(20a,22,24) and a multiplier(23); a color signal outputting part(105) outputting a color signal(Cout) by being switched through a dip switch(29) after passing each broad band pass filter(26a,26b,28a,28b) and chroma gain controller(27a,27b); and a signal interpolating part(104) outputting a luminance interpolation signal(YI) and a color interpolation signal(CI).

Description

복합영상신호의 세부보간회로Detailed interpolation circuit of composite video signal

제1도는 종래 복합영상신호의 보간회로도.1 is an interpolation circuit diagram of a conventional composite video signal.

제2도는 본 발명 복합영상신호의 보간회로도.2 is an interpolation circuit diagram of a composite video signal of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1,102 : 라인콤필터 2,101 : 프레임콤필터1,102: Linecom Filter 2,101: Framecom Filter

3,4,13,14,19a,19b,23,32,36a,36b : 승산기 5 : 움직임검출부3, 4, 13, 14, 19a, 19b, 23, 32, 36a, 36b: Multiplier 5: Motion detector

8 : 지연기8: delay

6,9,12,15,18a,18b,20a,20b,22,24,31,34a,35a,37a,34b,35b,37b : 가산기6,9,12,15,18a, 18b, 20a, 20b, 22,24,31,34a, 35a, 37a, 34b, 35b, 37b

7,26a,26b,28a,28b : 대역통과필터(BPF)7,26a, 26b, 28a, 28b: Bandpass Filter (BPF)

10,16,17 : 필드메모리 11,30 : 라인메모리10,16,17: field memory 11,30: line memory

21a,21b : 저역통과필터(LPF) 25 : 롬21a, 21b: Low pass filter (LPF) 25: ROM

27a,27b : 크로마게인조절부(CCG)27a, 27b: Chroma Gain Control Unit (CCG)

29 : 디프스위치29: deep switch

33a,33b,33c : 크로마제거용 필터33a, 33b, 33c: chroma removal filter

38a,38b,38c : 루마제거용 필터 103 : 휘도신호출력부38a, 38b, 38c: luma removal filter 103: luminance signal output unit

104 : 신호보간부 105 : 색신호출력부104: signal interpolation unit 105: color signal output unit

본 발명은 복합영상신호의 성분분리 및 보간에 관한 것으로, 특히 성분분리과정에서 감쇄되는 부분에 대해 세부적인 면까지 보상하고, 루마(Luma)에 대해서도 보간 가능하도록 한 복합영상신호의 세부보간회로에 관한 것이다.The present invention relates to component separation and interpolation of a composite video signal. Particularly, the present invention relates to a detailed interpolation circuit of a composite video signal that compensates for details of attenuated parts in a component separation process and makes interpolation possible for luma. It is about.

일반적으로 NTSC 복합영상신호가 휘도신호와 색도신호로 분리됨에 있어서, 3차원공간 스펙트럼 공간에서는 휘도신호와 색도신호가 서로 분리되어 있으나, 전송할 경우에는 1차원적으로 전송됨으로 인하여 휘도신호와 색도신호가 동일한 주파수대역에서 서로 중첩되어 완전히 분리되지 못함에 따라 상호간섭현상이 발생되었다.In general, NTSC composite video signals are separated into luminance signals and chromatic signals. In three-dimensional spatial spectral space, luminance signals and chromaticity signals are separated from each other. Interference phenomena occurred because they overlap each other in the same frequency band and could not be completely separated.

따라서 이와같은 간섭현상을 제거하기 위한 종래의 분리회로는 제1도에 도시한 바와같이, 라인콤필터(1), 프레임콤필터(2)를 통고한 복합영상신호가 승산기(3)(4), 가산기(6)를 통과함에 따라 Co(n)=K·V(n)+(1-K)·T(n)으로 되는 색도신호가 대역통과필터(7)를 통해 출력되며, 이때 지연기(8)를 통과한 복합영상신호가 상기 색도신호와 합성된 후 필드메모리(10), 라인메모리(11), 승산기(13),(14), 가산기(15)를 통해 연산기능을 수행함에 따라 휘도신호가 분리된다.Therefore, in the conventional separation circuit for removing such interference, the composite video signal transmitted through the line comb filter 1 and the frame comb filter 2 is multiplied by the multiplier 3 and 4, as shown in FIG. As the pass through the adder 6, a chroma signal of Co (n) = K · V (n) + (1-K) · T (n) is outputted through the band pass filter 7, where the delay unit After the composite video signal passing through (8) is combined with the chroma signal, the calculation function is performed through the field memory 10, the line memory 11, the multipliers 13, 14, and the adder 15. The luminance signal is separated.

여기서 프레임콤필터(2)의 출력(T(n))이 움직임검출부(5)를 통과함에 따라 상기 승산기(4)(13)(14)의 보간승산율(K)(1-K)이 결정된다.Here, as the output T (n) of the frame comb filter 2 passes through the motion detection unit 5, the interpolation multiplication ratio K (1-K) of the multipliers 4, 13 and 14 is determined. do.

그런데 상기와 같은 보간회로에 있어서는 성분분리와 보간회로가 각각 분리되므로 메모리가 많이 쓰이게 되며, 많은 승산기의 사용으로 인하여 경제적 손실이 커지게 되는 결함이 있었다.However, in the interpolation circuit as described above, since the component separation and the interpolation circuit are separated from each other, a lot of memory is used, and there is a defect that the economic loss increases due to the use of many multipliers.

또한 성분분리를 하는 과정에서 감쇄되는 효과가 매우 커지지만 보상을 해줄 수 있는 회로가 없었다.In addition, the effect of the attenuation is greatly increased during the separation process, but there was no circuit to compensate.

본 발명은 이와같은 종래의 결함을 감안하여 감쇄되는 부분에 대한 세부면까지 보상하면서 크로마신호, 루마신호를 보간함으로써 정확한 움직임, 정지화면을 검출함은 물론 적은 승산기 및 메모리의 사용으로 회로의 경제성을 상승하도록 한 복합영상신호의 세부보간회로를 창안한 것으로, 이를 첨부한 도면에 의해 상세히 설명하면 다음과 같다.In view of the conventional defects, the present invention compensates the details of the attenuated portion while interpolating chroma signals and luma signals to detect accurate motion and still images, as well as economical circuits by using fewer multipliers and memories. The detailed interpolation circuit of the composite video signal to be raised is created, which will be described in detail with reference to the accompanying drawings.

제2도는 본 발명 복합영상신호의 보간회로도로서 이에 도시한 바와같이, 입력되는 복합영상신호가 필드메모리(16)(17)를 통과하고, 가산기(18a)(18b), 승산기(19a)(19b)를 통해 크로마신호(CF)로 분리되게 한 프레임콤필터(101)와, 상기 입력되는 복합영상신호가 라인메모리(30)를 통과하고, 가산기(31), 승산기(32)의 연산기능을 통해 크로마신호(CH)로 분리되게 한 라인콤필터(102)와, 상기 프레임콤필터(101)이 크로마신호(CF)가 저역통과필터(21a)를 통과한 후 롬(25)에 저장되어 변화율(K)(M)을 출력하고, 가산기(18a), 가산기(20a)를 통해 승산기(19a)를 통과한 상기 복합영상신호의 합성되어 루마신호(YF)를 출력하며, 상기 라인콤필터(102)의 크로마신호(CH)가 저역통과필터(21b)를 통과한 후 상기 가산기(20b)를 통해 상기 라인메모리(30)의 출력과 가산되어 루마신호(YH)를 출력하고, 가산기(22)(24), 승산기(23)의 연산기능을 통해 휘도신호(Yout)를 출력하게 한 휘도신호출력부(103)와, 상기 프레임콤필터(101), 라인콤필터(102)의 크로마신호(CF)(CH)가 각각의 대역통과필터(26a)(26b)(28a)(28b), 크로마게인조절부(27a)(27b)를 통과한 후 디스프위치(29)를 통해 색도신호(Cout)를 출력하게 한 색신호출력부(105)와, 상기 복합영상신호, 상기 필드메모리(16), 라인메모리(30)의 출력이 각각의 크로마제거용 필터(33a-33c), 루마제거용 필터(38a-38c)를 통과한 후 가산기(34a)(35a)(37a), 승산기(36a)를 통해 휘도보간신호(Y1)를 출력하고, 가산기(34b)(35b)(37b), 승산기(36b)를 통해 색보간신호(C1)를 출력하게 한 신호보간부(104)로 구성한다.2 is an interpolation circuit diagram of the composite video signal of the present invention, as shown therein, the input composite video signal passes through the field memories 16, 17, and adders 18a, 18b, multipliers 19a, 19b. The frame comb filter 101, which is separated into the chroma signal C F , and the input composite video signal pass through the line memory 30 to perform the calculation functions of the adder 31 and the multiplier 32. The line comb filter 102, which is separated into the chroma signal C H , and the frame comb filter 101 is stored in the ROM 25 after the chroma signal C F passes through the low pass filter 21a. is the rate of change (K) (M) output, and an adder (18a), an adder (20a) is a composite of the composite video signal passes through the multiplier (19a) through the outputs of the luma signal (Y F), the line comb chroma signal (C H) is output and is added to the luma signal (Y H) of the low-pass filters the line memory 30 through the adder (20b) after passing through the (21b) of the filter (102) And a luminance signal output unit 103 for outputting the luminance signal Yout through the calculation functions of the adders 22, 24 and the multiplier 23, the frame comb filter 101, and the line comb filter ( The chroma signal C F (C H ) of the 102 passes through each of the band pass filters 26a, 26b, 28a and 28b and the chroma gain adjusting unit 27a and 27b, and then the dispensing position 29, the color signal output unit 105 which outputs the chroma signal Cout through the output of the complex video signal, the field memory 16, and the line memory 30 is respectively subjected to the chroma removal filter 33a-. 33c), after passing through the luma removal filters 38a to 38c, the luminance interpolation signal Y 1 is output through the adders 34a, 35a and 37a and the multiplier 36a, and the adders 34b and 35b. 37b and the signal interpolator 104 which outputs the color interpolation signal C1 through the multiplier 36b.

이와같이 구성된 본 발명의 작용효과를 설명하면 다음과 같다.Referring to the effects of the present invention configured as described above are as follows.

복합영상신호(Y-C)가 입력되면 필드메모리(16)(17)를 통해 프레임지연신호(Y+C)를 출력하고, 가산기(18a)(19a), 승산기(19a)(19b)를 통해 YF=(Y-C)+(Y+C)=2Y=2Y×1/2=YF와 같이 됨에 따라 루마신호(YF)가 출렴됨과 동시에 CF=(Y-C)+(Y+C)=-2C×1/2=-CF와 같이되어 크로마신호(CF)가 출력된다.When the composite video signal YC is input, the frame delay signal Y + C is output through the field memories 16 and 17, and Y F is added through the adders 18a and 19a and the multipliers 19a and 19b. = (YC) + (Y + C) = 2Y = 2Y × 1/2 = Y F As the luma signal (Y F ) converges, C F = (YC) + (Y + C) =-2C The chroma signal CF is output in the same manner as x 1/2 = -C F.

이때 상기 크로마신호(CF)가 저역필터(21)를 통해 보상된 후 메모리(25)에 저장되어 화상의 변화됨에 따라 선형적으로 변화되며, 상기 대역통과필터(CF)가 대역통과필터(26a)(28a), 크로마게인조절부(27a)를 통해 출력된다.At this time, the chroma signal C F is compensated through the low pass filter 21 and then stored in the memory 25 and linearly changed as the image is changed. The band pass filter C F is a band pass filter ( 26a) and 28a, and are output through the chroma gain control unit 27a.

이와 동시에 입력영상신호(Y-C)가 라인메모리(30)를 통해 신호(Y+C)로 지연되고, 상기와 같이 가산기(20b)(31), 승산기(32)를 통해 연삼됨에 따라루마신호(YF), 크로마신호(CH)가 출력되며, 이의 신호가 대역통과필터(26b)(28b), 크로마게인조절부(27b)를 통해 출력된다.At the same time, the input video signal YC is delayed to the signal Y + C through the line memory 30, and the luma signal Y as it is passed through the adders 20b and 31 and the multiplier 32 as described above. F ), a chroma signal (C H ) is output, and the signal thereof is output through band pass filters 26b and 28b and chroma gain control unit 27b.

여기서 정지화상인 경우에는 루마신호(YF)가 선택되고, 동화상인 경우에는 루마신호(YH)가 선택되어 가산기(22)(24), 승산기(23)를 통해 K(YH-YF)+YF=0와 같이됨에 따라 휘도신호(Yout)가 출력된다.In this case, the luma signal Y F is selected in the case of a still picture, and the luma signal Y H is selected in the case of a moving picture, and K (Y H -Y F ) is added through the adders 22 and 24 and the multiplier 23. As + Y F = 0, the luminance signal Yout is output.

또한 정지화상인 경우에는 디프스위치(29)의 선택으로 인하여 크로마신호(CF)가 색신호(Cout)로 출력되고, 통화상인 경우에는 라인콤필터(102)의 출력인 크로마신호(CH)가 색신호(Cout)로 출력된다.In the case of a still picture, the chroma signal C F is output as the color signal Cout due to the selection of the dip switch 29, and in the case of a call image, the chroma signal C H , which is the output of the line comb filter 102, is output. It is output as the color signal Cout.

즉 화면의 변화에 따라 프레임콤필터(101)의 출력인 크로마신호(CF) 및 라인콤필터(102)의 출력(CH)이 디스프스위치(29)를 통해 절환되어 색신호(Yunt)로 출력된다.That is, according to the change of the screen, the chroma signal C F , which is the output of the frame comb filter 101, and the output C H , which is the output of the line comb filter 102, are switched through the disp switch 29 to a color signal Yunt. Is output.

같은 방법으로 크로성분, 루마성분을 보간하기 위해서는 입력복합영상신호, 필드메모리(16)의 출력이 크로마제거용 필터(33a-33c), 루마제거용 필터(38a-38c)를 통해 각각의 크로마, 루마성분을 제게된 후 가산기(34a)(35a)(37a), 승산기(36a)를 통해 연산됨에 따라 보간휘도신호(YI)가 출력되고, 가산기(34b)(35b)(37b), 승산기(36b)를 통해 연산됨에 따라 보간색신호(CI)가 출력된다.In order to interpolate the chroma and luma components in the same way, the output of the input composite video signal and the field memory 16 are respectively separated through the chroma removal filters 33a to 33c and the luma removal filters 38a to 38c. After removing the luma component, the interpolation luminance signal Y I is output as it is calculated through the adders 34a, 35a, 37a, and multiplier 36a, and the adders 34b, 35b, 37b, and multiplier ( As calculated through 36b), the interpolation color signal CI is output.

즉 (CH-CF)K+CF=0과 같이 보간됨에 따라 정지화면인 경우에는 필드간 출력신호(CF)에 의해 구동되고, 동화면인 경우에는 라인간출력신호(CF)에 의해 동작된다.That is the (C H -C F) K + C F = 0 and as the interpolation as if the still image is being driven by the output signal (CF) from field to field, if such a screen is called a human output signal (C F) Is operated.

이상에서 상세히 설명한 바와같이 본 발명은 성분분리를 함으로써 야기되는 감쇄효과에 대해 세부적인 면까지 보상이 가능하며, 루마 및 크로마성분까지도 보상이 가능한 효과가 있다.As described in detail above, the present invention can compensate for the attenuation effect caused by the separation of the components in detail, and the luma and chroma components can be compensated.

또한 성분분리와 보간이 동시에 병행되어 메모리, 승산기의 수가 감소되므로 제품의 경제성을 향상할 수 있는 효과가 있다.In addition, since component separation and interpolation are performed simultaneously, the number of memory and multipliers is reduced, thereby improving the economics of the product.

Claims (1)

복합영상신호가 필드메모리(16)(17)를 통과하고, 가산기(18a)(18b), 승산기(19a)(19b)의 연산기능을 통해 크로마신호(CF)를 분리하는 프레임콤필터(101)와, 라인메모리(30)를 통과한 후 가산기(31), 승산기(32)의 연산기능을 통해 크로마신호(CH)를 분리하는 라인콤필터(102)와, 상기 프레임콤필터(101), 라인콤필터(102)의 출력이 저역통과필터(21a)(21b)를 통해 롬(25)에 저장함과 아울러 가산기(20a)(22)(24), 승산기(23)를 통해 휘도신호(Yout)를 출력하는 휘도신호출력부(103)와, 각각의 대역통과필터(26a)(26b)(28a)(28b), 크로마게인조절부(27a)(27b)를 통과한 후 디프스위치(29)를 통해 절환되어 색신호(Cout)로 출력되는 색신호출력부(105)와, 크로마제거용 필터(33a-33c), 루마제거용 필터(38a-38c)를 통과한 후 가산기(34a)(35a)(37a), 승산기(36a)를 통해 휘도보간신호(YI)를 출력하고, 가산기(34b)(35b)(37b), 승산기(36b)를 통해 색보간신호(CI)로 출력하는 신호보간부(104)로 구성하여 된 것을 특으로 하는 복합영상신호의 세부보간회로.The composite video signal passes through the field memories 16 and 17, and separates the chroma signal C F through the arithmetic functions of the adders 18a and 18b and the multipliers 19a and 19b. And the line comb filter 102 for separating the chroma signal C H through the arithmetic function of the adder 31 and the multiplier 32 after passing through the line memory 30, and the frame comb filter 101. In addition, the output of the line comb filter 102 is stored in the ROM 25 through the low pass filters 21a and 21b, and the luminance signal Yout through the adders 20a, 22, 24 and the multiplier 23. ) Is passed through the luminance signal output unit 103, the band pass filters 26a, 26b, 28a and 28b, and chroma gain control units 27a and 27b, respectively. After passing through the color signal output unit 105, the chroma removal filters 33a-33c, and the luma removal filters 38a-38c that are switched through and output as a color signal Cout (adder 34a, 35a) ( 37a), outputs the luminance interpolation signal Y I through multiplier 36a, and adder 34b. A detailed interpolation circuit for a composite video signal, characterized in that it comprises a signal interpolation unit (104) for outputting the color interpolation signal (C I ) through the (35b) (37b) and the multiplier (36b).
KR1019890001135A 1989-01-31 1989-01-31 Interpolation circuit of a composite video signal KR960013552B1 (en)

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KR1019890001135A KR960013552B1 (en) 1989-01-31 1989-01-31 Interpolation circuit of a composite video signal

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Application Number Priority Date Filing Date Title
KR1019890001135A KR960013552B1 (en) 1989-01-31 1989-01-31 Interpolation circuit of a composite video signal

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KR900012496A KR900012496A (en) 1990-08-04
KR960013552B1 true KR960013552B1 (en) 1996-10-07

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