KR960036800A

KR960036800A - Median filter with various window sizes

Info

Publication number: KR960036800A
Application number: KR1019950005800A
Authority: KR
Inventors: 정해묵
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1995-03-20
Filing date: 1995-03-20
Publication date: 1996-10-28
Also published as: KR100192777B1

Abstract

본 발명은 입력 영상을 프레임 단위로 저장하는 프레임 메모리(10)와; 프레임 메모리(10)에 저장된 영상 신호를 입력한 후, 3×3 윈도우 사이즈로 영역화하는 제1 영역화부(40); 프레임 메모리(10)에 저장된 영상신호를 입력한 후, 5×5 윈도우 사이즈로 영역화하는 제2 영역화부(60); 제1 영역화부(40)의 출력을 입력한 후 중앙값으로 필터링하는 제1 메디안 필터링부(50); 제2 영역부(60)의 출력을 입력한 후 중앙값으로 필터링하는 제2 메디안 필터링부(70); 프레임 메모리(10)로부터 입력된 영상신호의 국부분산값을 계산하는 국부분산값 계산부(2); 국부분산값 계산부(20)의 출력을 기준치와 비교하여 메디안 필터 선택신호를 출력하는 비교기(30); 비교기(30)의 메디안 필터 선택신호에 따라 제1 메디안 필터링부(50)의 출력이나 제2 메디안 필터링부(60)의 출력 중 하나를 선택하여 출력하는 선택기(80)로 구성되어 입력영상의 국부분산값에 따라 다양한 윈도우 사이즈로 필터링된 값중 하나를 선택할 수 있으므로 전체적으로 화질을 개선하면서 처리속도를 향상시킬 수 있는 효과가 있다.The present invention provides a frame memory for storing an input image on a frame basis; A first regioner 40 for inputting an image signal stored in the frame memory 10 and then segmenting the image signal into a 3 × 3 window size; A second regioner 60 for inputting an image signal stored in the frame memory 10 and then segmenting the image signal into a 5 × 5 window size; A first median filtering unit 50 for inputting the output of the first localization unit 40 and filtering the median value; A second median filtering unit 70 inputting an output of the second area unit 60 and filtering the median value; A local partial value calculating section 2 for calculating a local partial value of the video signal input from the frame memory 10; A comparator 30 for outputting a median filter selection signal by comparing the output of the local partial calculation unit 20 with a reference value; The selector 80 selects and outputs either the output of the first median filtering unit 50 or the output of the second median filtering unit 60 according to the median filter selection signal of the comparator 30. According to the variance value, one of the values filtered by various window sizes can be selected, thereby improving the overall image quality and improving the processing speed.

Description

Median filter with various window sizes

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

제1A도는 일반적인 메디안 필터링을 설명하기 위하여 도시한 도면, 제1B도는 3×3 윈도우 크기를 갖는 화면 블럭의 예, 제2도는 본 발명에 따른 메디안 필터를 도시한 블럭도이다.FIG. 1A is a diagram for explaining general median filtering, FIG. 1B is an example of a screen block having a 3 × 3 window size, and FIG. 2 is a block diagram showing a median filter according to the present invention.

Claims

A frame memory 10 for storing the input image in frame units; A first regioner 40 for inputting an image signal stored in the frame memory 10 and regioning the image signal in a 3 × 3 window size; A second regionizer 60 for inputting an image signal stored in the frame memory 10 and then segmenting the image signal into a 5 × 5 window size; A first median filtering unit 50 for inputting the output of the first localization unit 40 and filtering the median value; A second median filtering unit 70 for inputting an output of the second area unit 60 and filtering the median value; A local partial value calculator (2) for calculating local partial values of the video signal input from the frame memory (10); A comparator 30 for outputting a median filter selection signal by comparing the output of the local partial calculation unit 20 with a reference value; And a selector 80 configured to select and output one of an output of the first median filtering unit 50 and an output of the second median filtering unit 60 according to the median filter selection signal of the comparator 30. Median filter with various window sizes that select and smooth various window sizes according to the local partial value of the signal.

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