Post on 03-Jan-2016
description
Digital Signal ProcessingDigital Signal Processing( week 15 )( week 15 )
Digital Image Processing Digital Image Processing LAB.LAB.
프로젝트 12. 14( 목 ) 오후 7:00 홈페이지 : image.dgu.ac.kr/~cswon
만약 다운로드 안 될시 , F302 에 찾아오세요 ..
공지사항공지사항
Digital Image Processing Digital Image Processing LAB.LAB.
Warming Up Warming Up
필터 적용 예 ) 영상
시 작
끝
파일 열기 / 읽기
파일 저장 / 닫기
??
file_id = fopen(‘ 파일명 ');data = fread(file_id, [512, 512]);
fwrite(file_id, data, 8);fclose(file_id);
…
< m-file >
Digital Image Processing Digital Image Processing LAB.LAB.
Warming Up Warming Up
필터 적용 예 ) 음성
시 작
끝
파일 열기 / 읽기
파일 저장 / 닫기
??
[wav_data, Fs, Nbits]=wavread(‘ 파일명 .wav');
wavplay(wav_data);wavwrite(wav_data, Fs, Nbits, ’ 파일명 .wav’);
…
< m-file >
Digital Image Processing Digital Image Processing LAB.LAB.
Warming Up Warming Up
Pixel Quantization round( ) - 반올림 fix( ) - ‘0’ 을 향하여 양자화 floor( ) - minus infinity 쪽으로 양자화 ceil( ) - plus infinity 쪽으로 양자화 hist( ) – histogram clip( ) – clipping
Digital Image Processing Digital Image Processing LAB.LAB.
Histogram Histogram
Digital Image Processing Digital Image Processing LAB.LAB.
영상 반전 영상 반전
Digital Image Processing Digital Image Processing LAB.LAB.
영상 반전 영상 반전
< Original Image > < 반전영상 >
Digital Image Processing Digital Image Processing LAB.LAB.
ClippingClipping
Digital Image Processing Digital Image Processing LAB.LAB.
ClippingClipping
< Original Image > < Clipped Image >
Digital Image Processing Digital Image Processing LAB.LAB.
Running averaging Running averaging filterfilter
% 영상의 256 번째 줄 선택
% 7-point running filter 생성% filter 적용
Digital Image Processing Digital Image Processing LAB.LAB.
< Original Signal > < Filtered Signal >
Running averaging Running averaging filterfilter
Digital Image Processing Digital Image Processing LAB.LAB.
Running averaging Running averaging filterfilter
< X 축으로 필터링 > < Y 축으로 필터링 >
Digital Image Processing Digital Image Processing LAB.LAB.
< Original Image >
Running averaging Running averaging filterfilter
< X-Filtered >
Digital Image Processing Digital Image Processing LAB.LAB.
< Original Image > < Y-Filtered >
Running averaging Running averaging filterfilter
Digital Image Processing Digital Image Processing LAB.LAB.
Running averaging Running averaging filterfilter
< X-Y 축으로 필터링 >
Digital Image Processing Digital Image Processing LAB.LAB.
< Original Image > < XY-Filtered >
Running averaging Running averaging filterfilter
Digital Image Processing Digital Image Processing LAB.LAB.
Frequency Content of an Image Frequency Content of an Image (1)(1)
FIR 생성
< FIR 필터 >
Digital Image Processing Digital Image Processing LAB.LAB.
FIR 특성
< 필터 계수 ( 임펄스 응답의 계수 ) > < 주파수 응답 >
Frequency Content of an Image Frequency Content of an Image (1)(1)
Digital Image Processing Digital Image Processing LAB.LAB.
영상에 필터 적용
< 필터 생성 >
Frequency Content of an Image Frequency Content of an Image (1)(1)
Digital Image Processing Digital Image Processing LAB.LAB.
Frequency Content of an Image Frequency Content of an Image (2)(2)
FIR 생성
< FIR 필터 >
Digital Image Processing Digital Image Processing LAB.LAB.
FIR 특성
< 필터 계수 ( 임펄스 응답의 계수 ) > < 주파수 응답 >
Frequency Content of an Image Frequency Content of an Image (2)(2)
Digital Image Processing Digital Image Processing LAB.LAB.
영상에 필터 적용
< 필터 생성 >
Frequency Content of an Image Frequency Content of an Image (2)(2)
Digital Image Processing Digital Image Processing LAB.LAB.
Frequency Content of an Image Frequency Content of an Image (3)(3)
FIR 생성
< FIR 필터 >
Digital Image Processing Digital Image Processing LAB.LAB.
FIR 특성
< 필터 계수 ( 임펄스 응답의 계수 ) > < 주파수 응답 >
Frequency Content of an Image Frequency Content of an Image (3)(3)
Digital Image Processing Digital Image Processing LAB.LAB.
영상에 필터 적용
Frequency Content of an Image Frequency Content of an Image (3)(3)
< 필터 생성 >
Digital Image Processing Digital Image Processing LAB.LAB.
영상에 필터 적용
Frequency Content of an Image Frequency Content of an Image (3)(3)
Digital Image Processing Digital Image Processing LAB.LAB.
수고 하셨습니다