KR970025097A - Aspect ratio switching device and method of video signal - Google Patents

Aspect ratio switching device and method of video signal Download PDF

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Publication number
KR970025097A
KR970025097A KR1019950034439A KR19950034439A KR970025097A KR 970025097 A KR970025097 A KR 970025097A KR 1019950034439 A KR1019950034439 A KR 1019950034439A KR 19950034439 A KR19950034439 A KR 19950034439A KR 970025097 A KR970025097 A KR 970025097A
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South Korea
Prior art keywords
aspect ratio
signal
video signal
composite video
determining
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KR1019950034439A
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Korean (ko)
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KR0185929B1 (en
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이경훈
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김광호
삼성전자 주식회사
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/01Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H04N7/0117Conversion 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
    • H04N7/0122Conversion 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/04Synchronising
    • H04N5/08Separation of synchronising signals from picture signals

Abstract

영상신호의 화면비 전환방법 및 장치는 복합영상신호의 화면비를 자동으로 검출하여 적절한 화면비전환모드를 선택할 수 있도록 함으로써, 복합영상신호의 화면비를 스크린의 종횡 규격에 맞도록 자동으로 조정할 수 있도록 하기 위한 것이다. 본 발명의 화면비 전환방법은 일정한 화면비로 부호화 되어 있는 복합영상신호로부터 휘도신호의 밝기레벨에 따른 디지탈데이타를 입력받는 단계와, 복합영상신호로부터 분리한 수직, 수평동기신호에 동기하여 복합영상신호의 일정 수의 프레임에 대하여 각 프레임 필드의 모든 수평라인 구간에 신호가 있는지를 검사하는 단계와, 전술한 신호유무 판단에 근거하여 각 프레임의 시작라인 및 끝라인을 결정하는 단계와 각 프레임에 대하여 결정된 시작라인 및 끝라인을 비교하여 상기 복합영상신호의 화면비를 결정하는 단계 및 결정된 화면비를 이용하여 복합영상신호의 화면비를 조정하는 단계로 구성된다. 따라서, 본 발명은 입력되는 영상 프로그램의 화면비에 관계없이 사용자가 스크린의 종횡 규격에 맞는 화면을 시청할 수 있도록 함과 동시에, 사용자의 별도의 조정없이 화면비를 전환하므로 조작상의 편리함을 제공하는 효과가 있다.The aspect ratio switching method and apparatus of an image signal are to automatically adjust the aspect ratio of the composite image signal to the aspect ratio of the screen by automatically detecting the aspect ratio of the composite image signal and selecting an appropriate aspect ratio switching mode. . The aspect ratio switching method of the present invention comprises receiving digital data according to the brightness level of a luminance signal from a composite video signal encoded at a constant aspect ratio, and synchronizing the vertical and horizontal synchronous signals separated from the composite video signal. Checking whether there is a signal in every horizontal line section of each frame field for a predetermined number of frames, and determining start and end lines of each frame based on the above-described signal presence determination and determining for each frame Comparing the start line and the end line to determine the aspect ratio of the composite video signal, and adjusting the aspect ratio of the composite video signal using the determined aspect ratio. Accordingly, the present invention enables the user to watch a screen conforming to the vertical and horizontal standards of the screen regardless of the aspect ratio of the input image program, and at the same time, switching the aspect ratio without the user's separate adjustment has the effect of providing convenience in operation. .

Description

영상신호의 화면비 전환장치 및 방법Aspect ratio switching device and method of video signal

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 본 발명의 바람직한 실시예에 따른 영상신호의 화면비 전환장치를 나타내는 블록도.1 is a block diagram showing an aspect ratio switching apparatus of a video signal according to a preferred embodiment of the present invention.

Claims (7)

일정한 화면비로 부호화 되어있는 복합영상신호의 화면비를 전환하는 방법에 있어서, 입력되는 복합영상신호로부터 휘도신호의 밝기레벨에 따른 디지탈데이타를 입력받는 단계; 상기 복합영상신호로부터 분리한 수직, 수평동기신호에 동기하여 상기 복합영상신호의 일정 수의 프레임에 대하여 각 프레임의 모든 수평라인 구간에 상기 디지탈데이타가 있는지를 검사하는 신호검출단계;상기 신호검출단계의 신호유무 판단에 근거하여 각 프레임에서 상기 디지탈데이타가 처음 검출된 시작라인 및 상기 디지탈데이타가 마지막으로 검출된 끝라인을 결정하는 단계; 각 프레임에 대하여 결정된 상기 시작라인 및 끝라인을 비교하여 상기 복합영상신호의 화면비를 결정하는 화면비 판단단계; 및 상기 결정된 화면비를 이용하여 상기 복합영상신호의 화면비를 조정하는 단계를 포함하는 영상신호의 화면비 전환방법.A method of switching the aspect ratio of a composite video signal encoded at a constant aspect ratio, the method comprising: receiving digital data according to a brightness level of a luminance signal from an input composite video signal; A signal detecting step of checking whether there is the digital data in every horizontal line section of each frame for a predetermined number of frames of the composite video signal in synchronization with the vertical and horizontal synchronization signals separated from the composite video signal; Determining a start line at which the digital data was first detected and an end line at which the digital data was last detected in each frame based on the signal presence determination of the signal; An aspect ratio determination step of determining an aspect ratio of the composite video signal by comparing the start line and the end line determined for each frame; And adjusting the aspect ratio of the composite video signal using the determined aspect ratio. 제1항에 있어서, 상기 신호검출단계는 프레임 단위로 입력되는 복합영상신호의 수직동기신호를 인가받는 단계; 상기 수직동기신호에 따른 필드내의 수평동기신호를 인가받고, 상기 수평동기신호에 따른 수평라인상의 임의의 시점에서 상기 디지탈데이타를 일정 횟수로 샘플링하는 단계; 및 상기 샘플링의 결과에 근거하여 해당 수평라인의 신호유무를 판단하는 단계로 이루어진 것을 특징으로 하는 영상신호의 화면비 전환방법.The method of claim 1, wherein the detecting of the signal comprises: receiving a vertical synchronization signal of a composite video signal input in units of frames; Receiving a horizontal synchronization signal in a field according to the vertical synchronization signal, and sampling the digital data a predetermined number of times at any point on a horizontal line according to the horizontal synchronization signal; And determining the presence or absence of a signal of a corresponding horizontal line based on a result of the sampling. 제2항에 있어서, 상기 신호유무 판단은 상기 샘플링의 결과, 하나 이상의 샘플링 점에서 상기 디지털데이타가 검출된 수평라인에 대하여는 신호가 있는것으로 판단하고, 모든 샘플링점에 대하여 상기 디지털데이타가검출되지 않은 수평라인에 대하여는 신호가 없는 것으로 판단하는 것을 특징으로 하는 영상신호의 화면비 전환방법.3. The method of claim 2, wherein the determination of the presence or absence of the signal determines that there is a signal for the horizontal line where the digital data is detected at one or more sampling points as a result of the sampling, and the digital data is not detected for all sampling points. The aspect ratio switching method of a video signal, characterized in that it is determined that there is no signal for the horizontal line. 제3항에 있어서, 상기 화면비 판단단계는 상기 결정단계를 통해 결정된 일정 수의 프레임에 대한 시작라인 및 끝라인을 프레임단위로 저장하는 단계; 상기 프레임단위로 저장된 시작라인 및 끝라인을 비교하는 단계; 상기 비교결과에 근거하여 상기 복합영상신호의 화면비를 결정하는 단계; 및 결정된 화면비에 따라 기설정된 화면비 전환모드들중 적절한 전환모드를 선택하는 단계를 포함하는 영상신호의 화면비 전환방법.The method of claim 3, wherein the determining of the aspect ratio comprises: storing the start line and the end line for a predetermined number of frames determined by the determining step in units of frames; Comparing the start line and the end line stored in the frame unit; Determining an aspect ratio of the composite video signal based on the comparison result; And selecting an appropriate switching mode among preset aspect ratio switching modes according to the determined aspect ratio. 제4항에 있어서, 상기 화면비를 결정하는 단계는 일정 수의 프레임에 대하여 저장된 상기 시작라인 및 끝라인의 중간값을 상기 복합영상신호에 대한 시작라인 및 끝라인으로 결정하고 상기 시작라인 및 끝라인의 위치를 분석하여 상기 복합영상신호의 화면비를 결정하는 것을 특징으로 하는 영상신호의 화면비 전환방법.The method of claim 4, wherein the determining of the aspect ratio comprises determining a median value of the start line and the end line stored for a predetermined number of frames as a start line and an end line for the composite video signal. And determining the aspect ratio of the composite video signal by analyzing the position of the image signal. 일정한 화면비로 부호화 되어 있는 복합영상신호를 디코딩하여 화면상에 디스플레이하는 장치에 있어서, 복합영상신호의 휘도신호를 밝기 레벨에 따른 일정비트의 디지탈데이타로 변환하는 A/D변환기; 복합영상신호로부터 분리한 수평, 수직동기신호와 상기 디지탈데이타를 인가받아 복합영상신호의 화면비를 검출하고, 검출한 화면비에 따른 화면비전환모드를 선택하여 화면비조정부로 인가하는 화면비검출부; 및 상기 화면비전환모드에 따른 선택신호를 인가받아 상기 복합영상신호의 화면비를 전환하는 화면비조정부를 포함하는 영상신호의 화면비 전환장치.An apparatus for decoding a composite video signal encoded at a constant aspect ratio and displaying the same on a screen, the apparatus comprising: an A / D converter for converting a luminance signal of the composite video signal into digital data having a predetermined bit according to a brightness level; An aspect ratio detection unit for detecting the aspect ratio of the composite image signal by applying the horizontal and vertical synchronization signals separated from the composite image signal and selecting the aspect ratio switching mode according to the detected aspect ratio; And an aspect ratio adjusting unit configured to switch the aspect ratio of the composite video signal by receiving a selection signal according to the aspect ratio switching mode. 제6항에 있어서, 상기 화면지조정부는 상기 선택신호에 따라 복합영상신호를 가로방향, 또는 세로방향으로 이동, 확장하여 스크린 규격에 적당한 화면을 현시할수 있도록 하는것을 특징으로 하는 영상신호의 화면비 전환장치.7. The aspect ratio switch of claim 6, wherein the screen adjustment controller is configured to display a screen suitable for a screen standard by moving and expanding a composite video signal in a horizontal or vertical direction according to the selection signal. Device.
KR1019950034439A 1995-10-07 1995-10-07 Aspect ratios transformation apparatus and method of image signal KR0185929B1 (en)

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