KR100317353B1 - Method of erasing image - Google Patents

Method of erasing image Download PDF

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Publication number
KR100317353B1
KR100317353B1 KR1019940035104A KR19940035104A KR100317353B1 KR 100317353 B1 KR100317353 B1 KR 100317353B1 KR 1019940035104 A KR1019940035104 A KR 1019940035104A KR 19940035104 A KR19940035104 A KR 19940035104A KR 100317353 B1 KR100317353 B1 KR 100317353B1
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South Korea
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screen
aspect ratio
image
processing unit
unnecessary
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KR1019940035104A
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Korean (ko)
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KR960028383A (en
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한정택
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구자홍
엘지전자주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/24—Blanking circuits
    • 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
    • H04N7/0122—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 the input and the output signals having different aspect ratios

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Graphics (AREA)
  • Television Systems (AREA)
  • Details Of Television Scanning (AREA)

Abstract

PURPOSE: A method of erasing an image is provided to eliminate an unnecessary image portion using a blanking pulse generated from the existing on-screen/character multiplex processor without using an additional blanking pulse generator. CONSTITUTION: RGB signals corresponding to an unnecessary image portion, which are output from a video signal processor due to a variation of aspect ratio, are blocked from being supplied to a CPT using horizontal and vertical blanking pulses generated from an on-screen/character multiplex processor under the control of a controller. A black signal generated from the on-screen/character multiplex processor is provided to the CPT to blackening the unnecessary image portion(ST5). The unnecessary image portion corresponds to a region where jitter generates and an over-scan region.

Description

영상소거방법Image Mute Method

본 발명은 영상소거기술에 관한 것으로, 특히 티브이에서 화면비의 변경으로 화면테두리에서 발생하는 불필요한 영상영역을 없애는데 적당하도록 한 영상소거방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image erasing technology, and more particularly, to an image erasing method suitable for eliminating an unnecessary image area generated on a screen border by changing an aspect ratio of a TV.

일반적으로 화면테두리에서 발생하는 불필요한 영상영역은 티브이의 화면비를 바꾸어 줄 때 발생하며, 이러한 티브이의 화면비를 바꾸어 주는 화면비 변경모드로는, 제 1 도의 (가)와 같이 화면비 16:9를 4:3으로 바꾸어 주는 화면비 변경모드와, 화면비 4:3을 강제로 확장하여 (나)와 같이 16:9로 바꾸어 주는 화면비 변경모드와, (다)와 같이 화면비 4:3의 영상을 16:9로 바꾸어 주는 화면비 변경모드를 대표적으로 들 수 있다.In general, an unnecessary video area that occurs on the screen border is generated when the aspect ratio of the TV is changed. As an aspect ratio changing mode that changes the aspect ratio of the TV, the aspect ratio 16: 9 is 4: 3 as shown in FIG. The aspect ratio change mode to change the aspect ratio to 4: 9, the aspect ratio change mode to forcibly expand to 16: 9 as shown in (b), and the aspect ratio 4: 3 image to 16: 9 as shown at (c). Note is a typical aspect ratio change mode.

이러한 대표적인 화면비 변경모드중에서, 화면비 16:9를 4:3으로 바꾸어 주는 제 1 도 (가)와 같은 화면비 변경모드에서, 화면비 16:9의 화면에 화면비 4:3의 영상신호를 주사할 때 이 영상신호가 수평동기신호에 일정하게 실리지 않아, (가)에 도시된 바와같이, 화면비 4:3의 화면의 좌우테두리영역에 지터(jitter)(불규칙한 영상)발생영역(J1)(J2)이 생긴다.Among such representative aspect ratio changing modes, when scanning an aspect ratio 4: 3 image signal on an aspect ratio 16: 9 screen in the aspect ratio changing mode as shown in FIG. 1A which changes the aspect ratio 16: 9 to 4: 3. Since the video signal is not constantly loaded on the horizontal synchronization signal, as shown in (a), jitter (irregular video) generation areas J1 and J2 are formed in the left and right edge areas of the screen having an aspect ratio of 4: 3. .

그리고, 화면비 4:3의 영상을 16:9로 바꾸어 주는 (다)의 화면비 변경모드에서는, 과도주사(overscan)가 이루어지며, 이 과도주사로 상하의 과도주사영역(OV1)(OV2)에 영상신호가 실리게 되면 그 과도주사영역(OV1)(OV2)에 빔전하가 주사되므로 영상화질에 나쁜 영향을 줄 뿐만 아니라 씨피티(CPT ; Color Picture Tube)의 수명이 단축되게 된다.In the aspect ratio changing mode in which the aspect ratio 4: 3 is changed to 16: 9, overscan is performed, and the overscan is performed on the upper and lower transient scan areas OV1 and OV2. In this case, beam charges are scanned in the transient scanning areas OV1 and OV2, which not only adversely affects the image quality, but also shorten the life of the CPT (Color Picture Tube).

일반적으로, 위와같은 화면테두리의 지터발생영역(J1)(J2)이나 과도주사영역(OV1)(OV2)과 같은 불필요한 영상영역을 없애기 위해서 그 지터발생영역(J1)(J2)이나 과도주사영역(OV1)(OV2)을 블랙(black)처리(화면의 특정부분에 블랙영상이 나타나게 해 주는 것을 말함)해 준다.In general, in order to eliminate unnecessary image areas such as the jitter generating area J1 (J2) or the transient scanning area OV1 (OV2) of the screen border, the jitter generating area J1 (J2) or the excessive scanning area ( OV1) and OV2 are blacked (that is, the black image appears in a specific part of the screen).

제 2 도는 제1도와 같은 지터발생영역(J1)(J2)이나 과도주사영역(OV1)(OV2)을 블랙처리하는 종래 티브이의 일부구성을 나타낸 것으로, 도면부호 '104'로 나타낸 블랭킹(blanking)펄스발생부에서 이 일을 한다.FIG. 2 shows a part of a conventional TV which black-processes the jitter generating area J1 (J2) or the transient scanning area OV1 (OV2) as shown in FIG. 1, and blanking indicated by the numeral '104'. The pulse generator does this.

즉, 블랭킹펄스발생부(104)는 제 1 도 (가)의 지터발생영역(J1)(J2)을 블랙처리하기 위해, 편향처리부(101)에서 출력되는 수직,수평동기신호(V)(H)를 입력받아서, 제 3 도의 (가)에 나타낸 바와같이, 지터발생영역(J1)(J2)의 부근에서 하이(high)로 에지전이(edge transition)하는 수평블랭킹펄스(PBNK1)를 발생하고, 이 수평블랭킹펄스(PBNK1)로 그 지터발생영역(J1)(J2)을 블랙처리한다.That is, the blanking pulse generator 104 vertically and horizontally synchronizes the output signal V from the deflection processor 101 to blacken the jitter generation regions J1 and J2 of FIG. ), As shown in (a) of FIG. 3, a horizontal blanking pulse P BNK1 is generated, which edge transitions to high in the vicinity of the jitter generating regions J1 and J2. The jitter generation regions J1 and J2 are blackened with this horizontal blanking pulse P BNK1 .

그리고, 제 1 도 (다)의 과도주사영역(OV1)(OV2)을 블랙처리하기 위해, 블랭킹펄스발생부(104)는 편향처리부(101)로부터 수직,수평동기신호(V)(H)를 입력받아서, 제 3 도의 (나)에 나타낸 바와같이, 과도주사영역(OV1)(OV2)의 부근에서 하이로 에지전이하는 수직블랭킹펄스(PBNK2)를 발생하고, 이 수직블랭킹펄스(PBNK2)로 그 과도주사영역(OV1)(OV2)을 블랙처리한다.Then, in order to black process the transient scanning areas OV1 and OV2 of FIG. 1 (c), the blanking pulse generating unit 104 receives the vertical and horizontal synchronization signals V and H from the deflection processing unit 101. FIG. In response to the input, as shown in FIG. 3B, a vertical blanking pulse P BNK2 is generated which edge transitions high in the vicinity of the transient scanning regions OV1 and OV2, and this vertical blanking pulse P BNK2 is generated . The log transient scanning area OV1 (OV2) is blackened.

제 2 도에서 미설명부호 '102'는 복합영상신호(CVBS)를 입력으로 하여 알지비신호(R,G,B)를 발생하는 영상신호처리부이다.In FIG. 2, reference numeral 102 denotes an image signal processor which generates the RG signals R, G, and B by inputting the composite video signal CVBS.

이러한 구성과 작용을 가지는 종래기술에서의 문제점은, 지터발생영역과 과도주사영역과 같은 불필요한 영상영역을 없애는 데 별도의 블랭킹펄스발생부를 이용함으로 인해 구성이 복잡해지고, 그리고 화면비 변경모드를 다양하게 할 때에 이에 맞는 새로운 블랭킹펄스를 발생해야 하므로 상기 블랭킹펄스발생부와 같은 블랭킹펄스 발생 관련구성이 매우 복잡해 진다는 것이다.The problem with the prior art having such a configuration and operation is that the configuration is complicated by using a separate blanking pulse generator to eliminate unnecessary image areas such as jitter generation region and overscanning region, and it is possible to vary the aspect ratio changing mode. Since a new blanking pulse has to be generated at this time, a blanking pulse generation related configuration such as the blanking pulse generator becomes very complicated.

본 발명은 이러한 종래 기술에서의 문제점이 감안되어 창안된 것이다.The present invention has been made in view of the above problems in the prior art.

본 발명의 목적은, 별도의 블랭킹 펄스 발생부를 사용하지 않고 기존의 온스크린/문자다중처리부에서 발생되는 블랭킹펄스를 이용하여 불필요한 영상영역을 없앨 수 있는 영상소거방법을 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide an image erasing method capable of eliminating unnecessary image regions by using a blanking pulse generated in an existing on-screen / text multiplexer without using a separate blanking pulse generator.

본 발명의 다른 목적은, 화면비 변경모드를 다양하게 할 때에 제어부에서의 간단한 제어로 필요한 블랭킹펄스를 발생할 수 있는 영상소거방법을 제공하는데 있다.Another object of the present invention is to provide an image erasing method capable of generating the necessary blanking pulses by simple control in the control unit when varying the aspect ratio changing mode.

상기 목적들에 따른 본 발명 영상소거방법은, 온스크린/문자다중처리부에서 제어부의 제어로 발생되는 블랭킹펄스를 이용해서, 화면비 변경으로 영상신호처리부에서 출력되는 불필요한 영상영역에 해당하는 알지비신호가 씨피티에 공급되지 못하도록 그 알지비신호를 차단하는 제1과정과; 상기 제1과정에서 불필요한 영상영역에 해당하는 알지비신호를 차단한 후 상기 온스크린/문자다중처리부에서 발생되는 블랙신호를 상기 씨피티에 공급해서 불필요한 영상영역을 블랙처리하여 없애는 제2과정으로 이루어진다.According to the present invention, the image erasing method uses a blanking pulse generated by the control of the controller in the on-screen / text multi-processing unit, and an Algi ratio signal corresponding to an unnecessary image area outputted from the image signal processing unit is changed by changing the aspect ratio. A first step of blocking the algibi signal from being supplied to the Citi; In the first process, a second process is performed to block an unnecessary image area, and then supply a black signal generated by the on-screen / text multi-processing unit to the Citi for black processing to remove the unnecessary image area.

이와같이 이루어진 본 발명 영상소거방법의 전체적인 작용 및 효과를 일실시예를 나타낸 제 4 도 내지 제 7 도를 참조하여 상세히 설명한다.The overall operation and effect of the image erasing method of the present invention made as described above will be described in detail with reference to FIGS. 4 to 7 showing one embodiment.

제 4 도에 나타낸 바와같이, 본 발명의 구현을 위해, 티브이의 영상신호처리부(202)에서 출력되는 수평,수직동기신호(H)(V)는 편향제어부(201)와 온스크린/문자다중처리부(206)에 공급되고, 알지비신호(R,G,B)는 알지비스위칭부(203)에 입력되며, 상기 온스크린/문자다중처리부(206)에서 출력되는 수평,수직블랭킹펄스(PBNK1,2)와 블랙신호(R1,G1,B1)는 알지비스위칭부(203)에 입력되고, 제어부(205)에서 이들 알지비스위칭부(203)와 영상신호처리부(202)와 편향제어부(301)의 동작을 제어하도록 구성된다.As shown in Figure 4, for the implementation of the present invention, the horizontal, vertical synchronous signal (H) (V) output from the video signal processing unit 202 of the TV is the deflection control unit 201 and on-screen / character multiple processing unit The horizontal and vertical blanking pulses P BNK1 are supplied to the 206, and the Al Zi signals R, G, and B are inputted to the Al Zibis switching unit 203 and output from the on-screen / text multi-processing unit 206. And 2 ) and the black signals R1, G1, and B1 are inputted to the Alzibis switching unit 203, and the control unit 205 transmits the Alzibis switching unit 203, the image signal processing unit 202, and the deflection control unit 301. Control the operation of the < RTI ID = 0.0 >

이러한 구성을 가지고 먼저 화질에 나쁜 영역을 줄 뿐만아니라 씨피티의 수명을 단축시킬 수 있는 과도주사영역을 블랙처리하는 경우를 설명한다.With this configuration, a case of blacking a transient scanning area that can not only give a bad area to image quality but also shorten the life of Citi will be described.

제 5 도와 제 6 도를 참조한다.See FIGS. 5 and 6.

제어부(205)에서 화면비 변경여부를 체크하고(ST1), 편향제어부(201)로 편향을 제어하여 화면비 4:3의 영상화면을 16:9의 영상화면으로 바꾼 상태에서(ST2), 제어부(205)에서는 복합영상신호(CVBS)를 입력으로 하는 영상신호처리부(202)가 알지비스위칭부(203)를 통해 제 5 도의 과도주사영역(OV1)(OV2)에 불필요한 알지비신호를 주사하고 있는지 판단한다. 즉, 불필요한 영상영역인 과도주사영역(OV1)(OV2)을 블랙처리할 것인지를 판단한다(ST3).The control unit 205 checks whether the aspect ratio is changed (ST1), and the deflection control unit 201 controls the deflection to change the aspect ratio 4: 3 image screen to the 16: 9 image screen (ST2), and the control unit 205 In this case, it is determined whether the image signal processing unit 202 which inputs the composite image signal CVBS is scanning an unnecessary ALG ratio signal to the transient scanning area OV1 and OV2 of FIG. do. That is, it is determined whether or not to overprocess the excessive scanning area OV1 and OV2 which are unnecessary image areas (ST3).

영상신호처리부(202)에서 출력되는 제 5 도 (나)의 알지비신호(R,G,B)중에서 ①과 ③이 (가)의 과도주사영역(OV1)(OV2)에 주사되는 부분이다.1 and 3 are portions scanned by the transient scanning area OV1 and OV2 of the algi ratio signals R, G, and B of FIG. 5B output from the image signal processing unit 202. FIG.

과도주사영역(OV1)(OV2)에 알지비신호①과 ③이 주사되고 있는 것으로 판단되면, 제어부(205)에서는 온스크린/문자다중처리부(206)를 제어하게 되고, 이 제어로 그 온스크린/문자다중처리부(206)에서 블랙신호(R1,G1,B1)와, 제 5 도 (다)에나타낸 바와같이 (나)의 알지비신호①과 ③부근에서 하이로 에지전이되는 수직블랭킹펄스(PBNK2)가 출력되어 알지비스위칭부(203)에 공급된다(ST4).If it is determined that the ALG signals ① and ③ are being scanned in the transient scanning area OV1 (OV2), the control unit 205 controls the on-screen / text multi-processing unit 206, and this control controls the on-screen / In the character multiplexer 206, the black signals R1, G1, B1, and vertical blanking pulses P which are edge-transmitted high near the Al signal ratios ① and ③ of (B) as shown in FIG. 5 (C). BNK2 ) is output and supplied to the algibis switching unit 203 (ST4).

이와같이, 온스크린/문자다중처리부(206)로부터 수직블랭킹펄스(PBNK2)와 블랙신호(R1,G1,B1)를 입력받은 알지비스위칭부(203)는 그 수직블랭킹펄스(PBNK2)에 따라 영상신호처리부(202)로부터 입력되는 과도주사영역(OV1)(OV2)에 해당하는 알지비신호①,③를 차단하고 온스크린/문자다중처리부(206)의 상기 블랙신호(R1,G1,B1)를 씨피티(207)에 공급하여 과도주사영역(OV1)(OV2)을 블랙처리한다(ST5).In this way, the on-screen / teletext processing unit 206 know who entered a vertical blanking pulse (P BNK2) and black signals (R1, G1, B1) from the non-switching unit 203 in accordance with the vertical blanking pulse (P BNK2) The black signals R1, G1, and B1 of the on-screen / text multi-processing unit 206 are blocked by blocking the ALG signals ① and ③ corresponding to the transient scanning areas OV1 and OV2 input from the image signal processing unit 202. Is supplied to the Citi 207 to black process the transient scanning areas OV1 and OV2 (ST5).

다음에, 지터발생영역을 블랙처리하는 경우를 설명한다.Next, the case of blacking the jitter generation area will be described.

제 6 도와 제 7 도를 참조한다.See FIGS. 6 and 7.

제어부(205)에서 화면비 변경여부를 체크하고 편향제어부(201)로 편향을 제어하여 화면비 16:9의 영상화면을 4:3의 영상화면으로 바꾼 상태에서(ST1)(ST2), 영상신호처리부(202)의 알지비신호(R,G,B) 공급으로, 제 7 도 (가)에 나타낸 바와같이, 지터발생영역(J1)(J2)이 생기는지를 판단한다(ST3).The control unit 205 checks whether the aspect ratio is changed and controls the deflection with the deflection control unit 201 so that the video screen with the aspect ratio 16: 9 is changed to the 4: 3 video screen (ST1) (ST2), and the video signal processing unit ( By supplying the algi ratio signals R, G, and B of 202, it is judged whether jitter generation regions J1 and J2 occur as shown in Fig. 7A (ST3).

제 7 도 (나)의 알지비신호(R,G,B)중에서 ①과 ③이 지터발생영역(J1)(J2)을 야기시키는 부분이다.In the algi ratio signals R, G, and B of FIG. 7B,? And? Are the portions causing jitter generating regions J1 and J2.

지터발생영역(J1)(J2)이 생긴 것으로 판단되면, 제어부(205)에서는 온스크린/문자다중처리부(206)를 제어하게 되고, 이 제어로 그 온스크린/문자다중처리부(206)에서 블랙신호(R1,G1,B1)와, 제 7 도 (다)에 나타낸 바와같이 (나)의 영상신호처리부(202)의 알지비신호(R,G,B) 파형중에서 ①과 ③부분에서 하이로 에지전이되는 수평블랭킹펄스(PBNK1)가 출력되어 알지비스위칭부(203)에 공급된다(ST4).If it is determined that the jitter generation area J1 or J2 has occurred, the control unit 205 controls the on-screen / text multi-processing unit 206, and the on-screen / text multi-processing unit 206 controls the black signal. (R1, G1, B1) and the high edges at (1) and (3) of the RG signal (R, G, B) waveforms of the video signal processing unit 202 of (B) as shown in FIG. The horizontal blanking pulse P BNK1 to be transferred is output and supplied to the algibis switching unit 203 (ST4).

알지비스위칭부(203)는 온스크린/문자다중처리부(206)의 수평블랭킹펄스(PBNK1)에 따라 영상신호처리부(202)로부터 입력되는 지터발생영역(J1)(J2)에 해당하는 알지비신호를 차단하고, 온스크린/문자다중처리부(206)의 블랙신호(R1,G1,B1)를 씨피티(207)에 공급하여 지터발생영역(J1)(J2)을 블랙처리한다(ST5).The algibis switching unit 203 corresponds to an jitter generation area J1 (J2) input from the image signal processing unit 202 according to the horizontal blanking pulse P BNK1 of the on-screen / text multiplexing unit 206. The signal is cut off, and the black signals R1, G1, and B1 of the on-screen / text multi-processing unit 206 are supplied to the Citi 207 to black process the jitter generating regions J1 and J2 (ST5).

이와같이, 본 발명에서는 별도의 블랭킹펄스발생부없이 기존의 온스크린/문자다중처리부(206)를 이용하여 간단히 효율적으로 불필요한 영상영역을 없앨 수 있으며, 화면비를 다양하게 하기 위해 새로운 화면비 변경모드가 추가되면 블랭킹펄스발생부의 구성추가없이 제어부(205)에 의한 온스크린/문자다중처리부(206)의 제어를 통해 그 새로운 화면비 변경모드에 맞는 블랭킹펄스를 발생할 수 있다.As described above, in the present invention, the unnecessary on-screen / text multi-processing unit 206 can easily remove unnecessary image areas without a separate blanking pulse generating unit, and when a new aspect ratio changing mode is added to vary the aspect ratio, The blanking pulse for the new aspect ratio changing mode can be generated through the control of the on-screen / text multi-processing unit 206 by the control unit 205 without adding the blanking pulse generator.

이상에서 상세히 설명한 바와같이, 본 발명은 온스크린/문자다중처리부에서 출력되는 수평,수직블랭킹펄스를 이용하여 화면의 지터발생영역이나 과도주사영역과 같은 불필요한 영상영역을 없앰으로써 구성이 간단해지고, 화면비 변경모드 추가시 별도구성없이 제어부에서의 온스크린/문자다중처리부 제어를 통해 간단히 그리고 효율적으로 불필요한 영상영역을 블랙처리할 수 있다는 효과를 갖는다.As described in detail above, the present invention simplifies the configuration by eliminating unnecessary image areas such as jitter generation areas or overscan areas by using horizontal and vertical blanking pulses output from the on-screen / text multi-processing unit. When the change mode is added, it is possible to black process unnecessary image areas simply and efficiently by controlling the on-screen / text multi-processing unit in the controller without additional configuration.

제 1 도는 일반적인 화면비 변경모드에서의 화면비 구성도.1 is an aspect ratio configuration diagram in a general aspect ratio change mode.

제 2 도는 종래 영상소거방법이 적용된 티브이 블럭도.2 is a TV block diagram to which a conventional image muting method is applied.

제 3 도는 제2도에서의 불필요한 영상영역 소거관련도.3 is an unnecessary image region erasing relation in FIG.

제 4 도는 본 발명 영상소거방법이 적용된 티브이 블럭도.4 is a TV block diagram to which the image muting method of the present invention is applied.

제 5 도는 제4도에서의 과도주사영역 소거관련도.Fig. 5 is a diagram showing the overscan area erasing in Fig. 4;

제 6 도는 제4도의 동작흐름도.6 is a flow chart of FIG.

제 7 도는 제4도에서의 지터발생영역 소거관련도.7 is a diagram illustrating jitter generation area erasing in FIG. 4;

**** 도면의 주요영역에 대한 부호의 설명 ******** Explanation of symbols for main areas of the drawing ****

201 : 편향제어부 202 : 영상신호처리부201: deflection control unit 202: image signal processing unit

203 : 알지비스위칭부 205 : 제어부203: Algibis switching unit 205: control unit

206 : 온스크린/문자다중처리부 207 : 씨피티206: on-screen / text multi-processing unit 207: Citi

Claims (3)

제어부의 제어로 온스크린/문자다중처리부에서 발생되는 수평,수직블랭킹펄스를 이용해서, 화면비 변경으로 영상신호처리부에서 출력되는 불필요한 영상영역에 해당하는 알지비신호가 씨피티에 공급되지 않도록 그 알지비신호를 차단하는 제1과정과; 상기 제1과정에서 불필요한 영상영역에 해당하는 알지비신호를 차단한 후 상기 온스크린/문자다중처리부에서 발생되는 블랙신호를 상기 씨피티에 공급해서 불필요한 영상영역을 블랙처리하여 없애는 제2과정으로 이루어진 것을 특징으로 하는 영상소거방법.By using the horizontal and vertical blanking pulses generated by the on-screen / text multi-processing unit under the control of the control unit, the ALG-B signal is not supplied to the Cititi corresponding to the unnecessary video area output from the image signal processing unit by changing the aspect ratio. A first process of blocking; And a second process of cutting off the ALGBI signal corresponding to the unnecessary image region in the first process and then supplying the black signal generated by the on-screen / text multi-processing unit to the Citi for removing the unnecessary image region by black processing. Image erasing method characterized in that. 제1항에 있어서, 불필요한 영상영역은 지터발생영역과 과도주사영역인 것을 특징으로 하는 영상소거방법.2. The method according to claim 1, wherein the unnecessary image area is a jitter generation area and a transient scanning area. 제1항에 있어서, 화면비 변경모드를 다양하게 할 때에 상기 제어부에서 상기 온스크린/문자다중처리부를 제어하여 필요한 수평,수직블랭킹펄스를 얻는 것을 특징으로 하는 영상소거방법.The image erasing method according to claim 1, wherein when the aspect ratio changing mode is varied, the control unit controls the on-screen / text multiplexing unit to obtain necessary horizontal and vertical blanking pulses.
KR1019940035104A 1994-12-19 1994-12-19 Method of erasing image KR100317353B1 (en)

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JPH06133237A (en) * 1992-10-20 1994-05-13 Mitsubishi Electric Corp Television receiver
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JPH04124983A (en) * 1990-09-17 1992-04-24 Pioneer Electron Corp Picture display system
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JPH06133237A (en) * 1992-10-20 1994-05-13 Mitsubishi Electric Corp Television receiver
KR950005022A (en) * 1993-07-31 1995-02-18 김광호 Blanking level adjusting method and device

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