KR900001643B1 - Double scanning pictore signal processing circuit for television - Google Patents

Double scanning pictore signal processing circuit for television Download PDF

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KR900001643B1
KR900001643B1 KR1019860006387A KR860006387A KR900001643B1 KR 900001643 B1 KR900001643 B1 KR 900001643B1 KR 1019860006387 A KR1019860006387 A KR 1019860006387A KR 860006387 A KR860006387 A KR 860006387A KR 900001643 B1 KR900001643 B1 KR 900001643B1
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South Korea
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output
multiplexer
memories
adder
memory
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KR1019860006387A
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Korean (ko)
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KR880003519A (en
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우영섭
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주식회사 금성사
구자학
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/30Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines

Abstract

The circuit for improving the image sharpness includes a multiplexer (1) receiving the digital image signal corresponding to vertical scanning line, memories (2,3) storing the output of the multiplexer alternatively by the write pulse (PW), an interpolation memory (4) storing the data from the memories (2,3) alternatively and providing them to an adder (7) adding them in parallel, and a shift register (8) providing the right-shifted and half-divided signal. The contents in the memories (2,3) are read/write alternatively with double speed such that the one vertical scanning signal is interpolated in the interpolation memory (4), then the circuit provides double scanning signal to the CRT.

Description

TV 수상기용 2배 주사화상 처리장치Double scanning image processing device for TV receiver

제1도는 본 발명 장치의 회로도.1 is a circuit diagram of an apparatus of the present invention.

제2a도- 제2h도는 본 발명 장치의 각부 신호 파형도.2A to 2H are signal waveform diagrams of respective parts of the apparatus of the present invention.

제3도는 종래 장치의 회로도.3 is a circuit diagram of a conventional device.

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

1, 5 : 멀티플렉서 2, 3 : 메모리1, 5: multiplexer 2, 3: memory

4 : 보간 메모리 6 : 디멀티 플렉터4: interpolation memory 6: demultiplexer

7 : 가산기 8 : 변위 레지스터7: adder 8: displacement register

9 : 제어펄스 발생기 10 : 출력단자9: control pulse generator 10: output terminal

본 발명은 디지탈 필터에 의한 TV수상기용 고해상도 화상처리 장치에 관한 것으로 특히, 대형 화면을 갖는 TV수상기의 선예도를 증가시키기 위하여 선형 예측보간을 행한 2배 주사 화상 처리장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high resolution image processing apparatus for a TV receiver using a digital filter, and more particularly, to a double scanning image processing apparatus in which linear prediction interpolation is performed to increase the sharpness of a TV receiver having a large screen.

종래에 있어, NTSC방식 TV수상기 장치는 화면의 수직 방향으로 525번 전자비임을 주사 하였으나 화면의 크기가 20인치 이상되는 대형화면을 갖는 TV수상기는 화소 또는 주사선 사이의 간격이 넓혀져서 선예도가 감소되고 동시에 선형 깜박거림 현상이 발생된다. 이러한 종래의 장치로서는 제3도에 도시된 바와같이 멀티플렉서(53, 54)를 주사선 단위 메모리(51, 52)의 입출력에 각각 연결하고 펄스 발생기(55)외 출력으로 멀티플렉서(53, 54)를 제어하도록 구성된 것으로 이는 단순히 동일 주사선을 2번씩 주사하게 되므로 라인사이에 화상의 명도변부가 위치한다던가 하면 라인 깜박거림 현상이 발생될 뿐만 아니라, 선예도가 저하된다. 특히 펄스가 바뀌면 동일 주사선 위치에 영상 변화가 겁치게 되어 선예도가 저하되는 문제점이 있었다.Conventionally, the NTSC TV receiver has scanned an electron beam 525 times in the vertical direction of the screen, but the TV receiver having a large screen with a screen size of 20 inches or more is reduced in sharpness by widening the interval between pixels or scanning lines. At the same time, linear flicker occurs. As such a conventional apparatus, as shown in FIG. 3, the multiplexers 53 and 54 are connected to inputs and outputs of the scanning line unit memories 51 and 52, respectively, and the multiplexers 53 and 54 are controlled by an output other than the pulse generator 55. It is configured to simply scan the same scan line twice, so if the brightness edge of the image is located between the lines, not only line flicker occurs but sharpness is lowered. In particular, when the pulse is changed, there is a problem in that the sharpness is lowered because the image changes at the same scan line position.

본 발명은 이러한 종래의 문제점을 해결하기 위하여 주사선에 선형보간된 보간 주사선을 주사하도록 하여 선예도를 증가시키고 명도변부에 의한 깜박거림 현상을 해결할 수 있는 TV수상기용 2배 주사회상 처리 장치를 제공하는 것을 목적으로 하는 것으로, 이하 첨부된 도면을 참조하면서 본 발명을 상세히 설명하면 다음과 같다.The present invention is to provide a double main image processing apparatus for a TV receiver that can increase the sharpness and solve the flicker caused by the brightness variation by scanning the interpolated interpolation scan line to the scan line to solve this conventional problem. As an object, the present invention will be described in detail with reference to the accompanying drawings as follows.

제1도에 의하는 바와같이 본 발명 장치는 영상신호 입력을 멀티플렉서(1)를 통하여 메모리(2, 3)에 연결하고 메모리(2, 3)의 출력을 멀티플렉서(5)에 연결하되 제어펄스 발생기(9)의 제어 클록펄스 출력(PW, PR)으로 멀티플렉서(1, 5)를 각각 제어하도록 된 2배 주사선 처리장치에 있어, 메모리(2, 3)의 출력을 디멀티플렉서(6)의 각 입력(x, y)에 연결하고, 멀티플렉서(5)의 출력을 보간 메모리(4)를 통하여 가산기(7)에 인가함과 동시에 디멀티플렉서(6)의 출력을 가산기(7)에 인가하며, 가산기(7)의 출력은 변위 레지스터(8)을 통하여 출력단자(10)에 연결하여된 구성으로서, 미설명 부호 MW는 메모리 데이타 기록용 클록 펄스, MR은 메모리 데이타 해독용 클록 펄스이다.As shown in FIG. 1, the apparatus of the present invention connects a video signal input to the memories 2 and 3 through the multiplexer 1, and the output of the memories 2 and 3 to the multiplexer 5, but with a control pulse generator. In the double scanning line processing apparatus configured to control the multiplexers 1 and 5 respectively with the control clock pulse outputs PW and PR of (9), the outputs of the memories 2 and 3 are inputted to the respective inputs of the demultiplexer 6 ( x, y), the output of the multiplexer 5 is applied to the adder 7 through the interpolation memory 4, and at the same time the output of the demultiplexer 6 is applied to the adder 7, the adder 7 The output of is connected to the output terminal 10 through the displacement register 8, where reference numeral MW denotes a clock pulse for writing memory data, and MR denotes a clock pulse for reading memory data.

이러한 본 발명 장치의 작용효과를 설명하면 다음과 같다. 멀티플렉서(1)로 입력되는 신호는 색부반송파 주파수의 4배 주파수로 샘플링되어 8비트로 처리된 신호로서 15.75KHZ주기로 1수평주사선율 구성하는 디지털 영상정보이다.The operational effects of the device of the present invention will be described as follows. The signal input to the multiplexer 1 is sampled at 4 times the frequency of the color carrier frequency and processed into 8 bits, and is digital image information constituting one horizontal scan rate at 15.75 KHZ cycles.

이 신호는 제어펄스 발생기(9)로 부터 발생되는 기록펄스(PW)의 주클록에 의해 교번적으로 스위칭되는 멀티플렉서(1)로서 메모리(2, 3)에 1수평 주사선단위로 입력되어 진다. 메모리(2, 3)에 기억된 신호는 디멀티플렉서 (6)의 입력 (x, y)에 각각 인가됨과 동시에 멀티플렉서(5)의 3상태 버퍼 스위칭에 의해 보간 메모리(4)에 입력된다.This signal is input to the memories 2 and 3 in units of one horizontal scanning line as the multiplexer 1 which is alternately switched by the main clock of the write pulse PW generated from the control pulse generator 9. The signals stored in the memories 2, 3 are applied to the inputs (x, y) of the demultiplexer 6, respectively, and are input to the interpolation memory 4 by the tri-state buffer switching of the multiplexer 5.

이때 보간 메모리(4)에 입력되는 신호는 제어펄스 발생기(9)로부터 인가된 2배 수평 주파수 출력 펄스의 주 클록신호에 의해 메모리(2, 5)의 신호를 1주사선 주기 (15.75KHZ) 동안에 2번 독출하는 동일한 2개의 주사선 성분이 된다.At this time, the signal input to the interpolation memory 4 receives the signal of the memory 2, 5 by one of the main clock signal of the double horizontal frequency output pulse applied from the control pulse generator 9 during one scan line period (15.75KHZ). The same two scanning line components are read out once.

즉, 메모리(2)가 멀티플렉서(1)에 의해 기록입력되는 동안에 메모리(3)가 멀티플렉서(5)에 의해 선택되어져서 메모리(3)에 기억된 정보를 수평 주파수의 2배의 속도 (31.5KHZ)로 독출하여 보간 메모리(4)에 저장하고 보간 메모리(4)는 이와같이 입력된 연속되는 2개의 주사선 신호들을 1/2 H기간(여기서 H는 주사선 기간임) 동안 지연시켜 가산기(7)에 인가시킨다. 가산기(7)에서는 보간 메모리(4)에 의해 지연된 신호와 멀티플렉서 (5)와 동기되어 구동되는 디멀티플렉서(6)에 의해 선택되는 메모리(2, 3)의 신호를 병렬 가산 처리하여 그 출력을 변위레지스터(8)에 인가하며, 1비트 우측 변위로 1/2로 분할된 신호를 출력시킨다.That is, while the memory 2 is recorded and inputted by the multiplexer 1, the memory 3 is selected by the multiplexer 5 so that the information stored in the memory 3 is stored at a speed twice the horizontal frequency (31.5 KHZ). The interpolation memory 4 delays the two consecutive scanning line signals thus input for the 1/2 H period (where H is the scanning line period) and applies them to the adder 7. Let's do it. In the adder 7, the signals delayed by the interpolation memory 4 and the signals of the memories 2 and 3 selected by the demultiplexer 6 driven in synchronization with the multiplexer 5 are processed in parallel, and the output thereof is displaced. It applies to (8) and outputs the signal divided into 1/2 by 1 bit right displacement.

이와같이 출력된 신호는 통상적인 디지탈-아날로그(D/A) 변환기에 입력되어 영상처리 된다. 이와같은 디지탈 필터를 이용하여 종래의 단순한 2배주사 장치로 부터 출력되는 신호와 이를 1/2주사선 기간 동안 지연시킨 출력 신호와를 가산함으로써, 단순히 종래에 두배 주사함에 따라 더욱커진 인접 주사선 간의 명도변부위를 줄여줄 수 있다.The signal thus output is input to a conventional digital-to-analog (D / A) converter and image processed. By using such a digital filter, the signal output from a conventional simple double scanning device and the output signal delayed for a half scan line period are added, and thus the brightness change between the adjacent adjacent scan lines becomes larger as it is conventionally doubled. It can reduce the area.

이상에서 설명한 바와같이 본 발명에 의하면 단순히 2배 주사에 따른 명도변부에 의한 라인 깜박거림 현상을 제거할 수 있을 뿐만 바니라, 선예도를 증가시킬 수가 있는 것이다.As described above, according to the present invention, not only the line flicker caused by the brightness change part due to the double scan can be eliminated, but also the sharpness can be increased.

Claims (1)

영상신호 입력을 멀티플렉서(1)를 통하여 메모리(2, 3)에 연결하고, 메모리(2, 3)의 출력을 멀티플렉서(5)에 연결하되 제어펄스 발생기(9)의 제어클록 펄스 출력(PW, PR)으로 멀티플렉서(1, 5)를 각각 제어하도록된 2배 주사선 처리장치에 있어서, 메모리 (2, 3)의 출력을 디멀티플렉서(6)의 입력 (x, y)에 연결하고, 멀티플렉서 (5)의 출력을 보간 메모리(4)를 통하여 가산기(7)에 인가함과 동시에 디멀티플렉서 (6)의 출력을 가산기(7)에 인가하며, 가산기(7)의 출력은 변위 레지스터(8)를 통하여 출력단자(10)에 연결하여된 TV수상기용 2배 주사화상처리 장치.The video signal input is connected to the memories 2 and 3 through the multiplexer 1, and the outputs of the memories 2 and 3 are connected to the multiplexer 5, but the control clock pulse outputs PW, In the double scanning line processing apparatus configured to control the multiplexers 1, 5 respectively with a PR), the output of the memory 2, 3 is connected to the inputs (x, y) of the demultiplexer 6, and the multiplexer 5 The output of the adder 7 is applied to the adder 7 through the interpolation memory 4, and the output of the demultiplexer 6 is applied to the adder 7, and the output of the adder 7 is output through the displacement register 8. A double scanning image processing apparatus for a TV receiver connected to (10).
KR1019860006387A 1986-08-02 1986-08-02 Double scanning pictore signal processing circuit for television KR900001643B1 (en)

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KR1019860006387A KR900001643B1 (en) 1986-08-02 1986-08-02 Double scanning pictore signal processing circuit for television

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Application Number Priority Date Filing Date Title
KR1019860006387A KR900001643B1 (en) 1986-08-02 1986-08-02 Double scanning pictore signal processing circuit for television

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KR880003519A KR880003519A (en) 1988-05-17
KR900001643B1 true KR900001643B1 (en) 1990-03-17

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