KR970031823A - Contour Correction Device of Image Signal - Google Patents

Contour Correction Device of Image Signal Download PDF

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KR970031823A
KR970031823A KR1019950045762A KR19950045762A KR970031823A KR 970031823 A KR970031823 A KR 970031823A KR 1019950045762 A KR1019950045762 A KR 1019950045762A KR 19950045762 A KR19950045762 A KR 19950045762A KR 970031823 A KR970031823 A KR 970031823A
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contour
signal
video signal
image
horizontal
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KR100228663B1 (en
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황덕원
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김광호
삼성전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/142—Edging; Contouring
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/12—Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

본 발명은 영상의 밝기에 따라 적응적으로 영상신호의 윤곽을 보정하는 윤곽보정장치에 관한 것으로, 수직방향에 대한 수직윤곽신호를 추출하여 윤곽보정하는 수직윤곽보정수단과 프레임단위로 영상신호의 밝기를 검출하는 영상밝기검출수단과 주파수특성이 상이한 필터별로 대응하는 수평윤곽신호를 추출하는 수평윤곽추출수단 및 선택신호에 따라 해당 수평윤곽신호를 출력하는 선택수단과 수직방향에 대해 이미 윤곽보정된 영상신호를 강조하기 위해 추출된 수평윤곽신호를 더하는 합성수단으로 구성된다. 본 발명은 주파수특성이 각기 상이한 필터를 복수개 구비하여 영상신호의 밝기에 따라 수평방향에 대한 윤곽신호를 추출할 수 있어서 윤곽보정을 보다 충실하게 수행할 수 있으며, 특히 저휘도 영상신호를 윤곽보정시 화질의 열화를 방지할 수 있는 효과가 있다.The present invention relates to a contour correction device for adaptively correcting the contour of an image signal in accordance with the brightness of the image, the vertical contour correction means for extracting the contour contour by extracting the vertical contour signal in the vertical direction and the brightness of the image signal in units of frames The image brightness detection means for detecting the signal, the horizontal contour extraction means for extracting the horizontal contour signal corresponding to each filter having different frequency characteristics, the selection means for outputting the horizontal contour signal according to the selection signal, and the image already corrected for the vertical direction. Composed means for adding the extracted horizontal contour signal to emphasize the signal. According to the present invention, a plurality of filters having different frequency characteristics can be provided to extract the contour signal in the horizontal direction according to the brightness of the image signal, so that the contour correction can be more faithfully performed, especially when the low luminance image signal is corrected. There is an effect that can prevent deterioration of image quality.

Description

영상신호의 윤곽보정장치Contour Correction Device of Image Signal

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명에 따른 영상신호의 윤곽보정장치의 구성도.2 is a block diagram of a contour correction apparatus for an image signal according to the present invention.

제3도는 필터의 특성을 나타내는 것으로,3 shows the characteristics of the filter,

(a)는 제1고역통과필터의 특성도,(a) is a characteristic diagram of the first high pass filter,

(b)는 제2고역통과필터의 특성도,(b) is a characteristic diagram of the second high pass filter,

(c)는 대역통과필터의 특성도.(c) is characteristic diagram of band pass filter.

Claims (7)

영상신호의 윤곽보정장치에 있어서, 입력되는 영상신호의 수직윤곽을 보정하는 수직윤곽보정수단 ; 상기 영상신호의 밝기를 검출하고, 검출결과 사전 설정된 다수의 선택신호들 중 어느 하나를 출력하는 영상밝기검출수단 ; 소정 주파수대를 통과시키는 적어도 둘 이상의 필터들을 구비하여, 상기 영상신호로부터 각 필터별로 대응하는 수평윤곽신호를 추출하는 수평윤곽추출수단 ; 상기 영상밝기검출수단의 선택신호에 따라 상기 수평윤곽추출수단의 각 필터들 중 어느 하나를 합성수단으로 전환접속하는 선택수단 ; 및 상기 수직윤곽보정수단에 의해 윤곽보정된 영상신호와 상기 수평윤곽추출수단의 수평윤곽신호를 더하는 합성수단을 포함하는 것을 특징으로 하는 영상신호의 윤곽보정장치.A contour correction apparatus for a video signal, comprising: vertical contour correction means for correcting a vertical contour of an input video signal; Image brightness detection means for detecting the brightness of the video signal and outputting any one of a plurality of preset selection signals as a result of the detection; Horizontal contour extracting means having at least two filters passing through a predetermined frequency band and extracting a horizontal contour signal corresponding to each filter from the image signal; Selecting means for switching one of the filters of the horizontal contour extracting means into a combining means in accordance with a selection signal of the image brightness detecting means; And synthesizing means for adding the image signal contour corrected by the vertical contour correction means and the horizontal contour signal of the horizontal contour extracting means. 제1항에 있어서, 상기 영상밝기검출수단은 1프레임단위(또는 1필드단위)로 영상신호의 밝기를 검출하는 것을 특징으로 하는 영상신호의 윤곽보정장치.The contour correction apparatus according to claim 1, wherein the image brightness detecting means detects the brightness of the video signal in units of one frame (or one field). 제1항에 있어서, 상기 수평윤곽추출수단은 차단주파수가 서로 다른 고역통과필터들을 사용하는 것을 특징으로 하는 영상신호의 윤곽보정장치.The contour correction apparatus of claim 1, wherein the horizontal contour extracting means uses high pass filters having different cutoff frequencies. 제1항에 있어서, 상기 수평윤곽추출수단은 통과대역이 서로 다른 대역통과필터를 사용하는 것을 특징으로 하는 영상신호의 윤곽보정장치.The contour correction apparatus according to claim 1, wherein the horizontal contour extracting means uses band pass filters having different pass bands. 제1항에 있어서, 상기 선택수단은 영상신호의 밝기가 낮은 저휘도의 영상신호인 경우 차단주파수가 상대적으로 낮은 고역통과필터를 접속하는 것을 특징으로 하는 영상신호의 윤곽보정장치.2. The contour correction apparatus according to claim 1, wherein the selecting means connects a high pass filter having a relatively low cutoff frequency when the image signal is a low luminance video signal. 제1항에 있어서, 상기 수직윤곽보정수단은 소정기간 지연된 영상신호와 지연되지 않은 영상신호로부터 수직방향에 대한 수직윤곽신호를 추출하고, 추출된 수직윤곽신호를 지연된 영상신호에 부가하여 윤곽보정하는 것을 특징으로 하는 영상신호의 윤곽보정장치.The method of claim 1, wherein the vertical contour correction unit extracts a vertical contour signal in a vertical direction from a video signal that is delayed for a predetermined period and a video signal that is not delayed, and adds the extracted vertical contour signal to the delayed video signal to correct the contour. Contour correction device for a video signal, characterized in that. 제1항에 있어서, 상기 영상밝기검출수단은 소정기간 지연된 영상신호에 대해 각 화소값을 비교하여 소정 기준값 보다 큰 화소들의 개수에 따라 영상신호의 밝기를 검출하고, 검출결과에 따라 선택신호를 출력하는 것을 특징으로 하는 영상신호의 윤곽보정장치.The method of claim 1, wherein the image brightness detecting means compares each pixel value with respect to the video signal delayed for a predetermined period, detects the brightness of the video signal according to the number of pixels larger than a predetermined reference value, and outputs a selection signal according to the detection result. Contour correction device for a video signal, characterized in that. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950045762A 1995-11-30 1995-11-30 Device for correcting contour of an image signals Expired - Fee Related KR100228663B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100464396B1 (en) * 1997-11-27 2005-04-06 삼성전자주식회사 Vertical contour signal generator and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100989719B1 (en) 2008-12-31 2010-10-26 엠텍비젼 주식회사 Recording medium on which the image processing apparatus, the edge enhancement method and the edge enhancement method of the image processing apparatus are recorded

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100464396B1 (en) * 1997-11-27 2005-04-06 삼성전자주식회사 Vertical contour signal generator and method

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