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Extracting symbols from thumbnails with perl
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Extracting symbols from thumbnails with perl
1.
Perl을 이용한 영상오브젝트
추출 김현승@펄마니아
2.
Perl 에서의 영상처리 •Why
perl? –Rapid Prototyping –CPAN –perl CAN DO IT !!
3.
영상처리란? 1.영상의 전처리 2.영상의 분석 3.영상의
인식
4.
영상처리란? 1.영상의 전처리 2.영상의 분석 3.영상의
인식
5.
CPAN • use Image::Magick;
#The one. 주로 영상간의 합성에 사용 • use Prima; #Perl Graphic Toolkit IPA에 Image Class 기반을 제공 • use IPA; #Image Processing Algorithms Erosion, Dilation, Open 등의 영상처리 함수 제공
6.
미션: 로고를 찾아라 •
방송 3사의 저작권 소송 • 동영상에서 방송사의 로고 검출필요
7.
방송사 로고의 특징분석 •
로고는 위치가 정해져 있다. • 동영상 전반에 걸쳐 나타난다. • 결론 모든 영상에 공통적으로 있는 것을 찾 으면 된다.
8.
영상의 샘플 확보
9.
영상의 전처리!!
10.
영상의 합성 • Image::Magick
로 모든 영상을 합성한다.
11.
영상의 엣지 추출 •
Image::Magick 로 추출
12.
영상의 2진화 • IPA의
threshold 로 밝기 100 이하는 0, 100 이상은 255 로 양극화
13.
2진영상의 변형 처리 •
IPA의 erode, dilate 로 검은색 픽셀군을 확 실한 덩어리로…
14.
변형 영상처리
출처 : http://www.dspguide.com/ch25/4.htm
15.
2진영상의 변형 처리
16.
마스킹으로 로고 추출 •
최종결과물로 원본영상을 마스킹
17.
영상의 분석!!
18.
오브젝트의 위치추출 • IPA로
이미지를 2차원 배열로 만들어 탐색
19.
오브젝트의 위치추출 • 255
밝기값을 만나면 내부탐색 LEFT, TOP, WIDTH, HEIGHT
20.
추출한 로고들
21.
정리 • 영상처리도 perl로
신속히 할 수 있다. • Perl 은 CPAN이다. • 처음 보는 분야도 쉽게 접근할 수 있다.
22.
ㄱㅅ
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