KR960020550A

KR960020550A - Contour Correction Circuit of Digital Image

Info

Publication number: KR960020550A
Application number: KR1019940029867A
Authority: KR
Inventors: 민형석
Original assignee: 김광호; 삼성전자 주식회사
Priority date: 1994-11-15
Filing date: 1994-11-15
Publication date: 1996-06-17
Also published as: KR0176493B1

Abstract

대각선 방향의 화소 성분을 리드하여 윤곽을 검출하고 윤곽으로 검출된 두 개의 화소중에서 다른 하나의 화소보다 밝은 화소는 더욱 밝은 성분의 화소로 보정하고 어두운 화소는 더욱 어둡게 보정하는 디지탈 화상의 윤곽 보정 회로가 개시되는바, 이는 한 화상분의 휘도 데이타가 기록된 메모리로부터 대각선 방향의 두 화소를 리드하기 위하여 상기 메모리에 어드레스를 발생시키는 비교 데이타 리드 제어부와, 상기 비교 데이타 리드 제어부에서 발생되는 어드레스에 저장된 대각선 방향의 두 화소 데이타를 메모리로부터 리드하여 윤곽 부분을 검출하는 윤곽 검출부와, 상기 메모리에서 리드된 대각선 방향의 두 화소가 상기 윤곽 검출부에서 윤곽의 경계면이라고 판별되면 상기 메모리에서 리드된 두 개의 화소 중 어두운 휘도 성분을 가진 화소는 더욱 어둡게 보정하고 밝은 휘도 성분을 가진 화소는 더욱 밝게 보정하여 메모리에 기록하는 윤곽 보정부로 구성되어, 불분명한 디지탈 화상의 윤곽 부분을 간단한 회로 구성과 인간의 시각 특성을 이용하여 더욱 선명하게 나타내면서, 또한, 비교하고자 하는 부분의 수직 성분과 수평 성분을 동시에 비교할 수 있게 된다.A contour correction circuit of a digital image which reads a pixel component in a diagonal direction and detects a contour, and corrects a pixel brighter than the other pixel among the two pixels detected as the contour, and corrects a dark pixel darker. It is disclosed that the comparison data read control section generates an address in the memory for reading two pixels in a diagonal direction from a memory in which luminance data for one image is recorded, and a diagonal line stored at an address generated in the comparison data read control section. A contour detector for detecting contour parts by reading two pixel data in a direction from the memory; and if two pixels in a diagonal direction read from the memory are determined as boundary planes of the contours in the contour detector, a dark one of the two pixels read from the memory is detected. Pixels with luminance components The darker and brighter pixels are composed of a contour correction unit for brighter correction and recording in memory, making the contours of an unclear digital image more vivid using a simple circuit configuration and human visual characteristics. In addition, the vertical component and the horizontal component of the portion to be compared can be compared at the same time.

Description

Contour Correction Circuit of Digital Image

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

제2도는 이 발명에 따른 디지탈 화상의 윤곽 보정 회로를 나타낸 블럭도,2 is a block diagram showing a contour correction circuit of a digital image according to the present invention;

제3도는 상기 제2도의 윤곽 검출부의 상세 블럭도,3 is a detailed block diagram of the contour detection unit of FIG. 2;

제4도는 상기 제2도의 윤곽 보정부의 상세 블럭도.4 is a detailed block diagram of the contour correction unit of FIG. 2;

Claims

Comparison data read control means for generating an address of two pixel data in a diagonal direction in the memory to read two pixels in a diagonal direction from a memory in which luminance data of one image is recorded; Contour detection means for detecting a contour portion by reading two pixel data in a diagonal direction stored at an address; and reading the memory from the memory when two pixels in a diagonal direction read from the memory are identified as the boundary of the contour in the contour detection means. A contour correction circuit of a digital image, comprising: contour correction means for correcting a pixel having a dark luminance component darker among the two pixels, and correcting the pixel having a bright luminance component brighter.

2. The contour detection unit of claim 1, wherein the contour detection unit comprises: an operation unit which performs subtraction of luminance values of two pixels in a diagonal direction read from the memory, and compares an operation value calculated by the operation unit with a predetermined value, A contour correction circuit of a digital image, comprising: an outline limit value comparison section for discriminating two pixels in a diagonal direction, which are read from a memory, as a boundary of an outline, if it is determined to be large.

The method of claim 1, wherein the contour correction means compares the degree of contrast between the two luminance data in the diagonal direction read from the memory when the two luminance data in the diagonal direction read from the contour detection means are determined as the boundary of the contour. A luminance determiner for separating dark and bright pixels, a luminance corrector for correcting darker pixels and brighter brighter pixels among the two diagonal luminance data read from the memory by the output of the luminance determiner; If the two luminance data in the diagonal direction read by the contour detection means are determined as the boundary of the contour, the output of the luminance correction unit is selected, and if it is determined that the two luminance data are not the boundary of the contour, the luminance data of the two pixels read from the memory. An outline correction circuit for a digital image, comprising a selection unit for directly selecting.

4. The outline correction circuit of claim 3, wherein the selector comprises a multiplexer.

※ Note: The disclosure is based on the initial application.