lecture note - image processingmr.hanyang.ac.kr/wp-content/uploads/2012… · ppt file · web...
TRANSCRIPT
![Page 1: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/1.jpg)
컴퓨터 비젼 실습
Hanyang University
Image Compositing, Pseudo Color Conversion
![Page 2: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/2.jpg)
Department of Computer Science and Engineering, Hanyang University
Image Compositing
2
- 두 개의 영상을 합성하는 기술
- A 와 B 이렇게 두 개의 영상이 있으면 , B 영상으로부터 “좁은 범위의 색”을 제거하거나 투명하게 만들어서 뒤의 A 영상이 비치게 할 수 있다 .
● 크로마 키 (Chroma key)
![Page 3: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/3.jpg)
Department of Computer Science and Engineering, Hanyang University
Image Compositing
3
![Page 4: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/4.jpg)
Department of Computer Science and Engineering, Hanyang University
Image Compositing
4
![Page 5: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/5.jpg)
Department of Computer Science and Engineering, Hanyang University
Image Compositing
5
![Page 6: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/6.jpg)
Department of Computer Science and Engineering, Hanyang University
Image Compositing
6
![Page 7: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/7.jpg)
Department of Computer Science and Engineering, Hanyang University
Image Compositing
7
![Page 8: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/8.jpg)
Department of Computer Science and Engineering, Hanyang University
Image Compositing
8
파란색상영역을 크로마 키로 사용할 경우 ,
1. RGB 영상을 YCbCr 영상으로 변환한다 .2. YCbCr 영상을 Y, Cb, Cr 의 3 가지 채널로 분리한다 .3. Cb 영상에서 일정 임계값 이상 ( 파란색 영역 ) 의 영역을 0
로 , 그 미만을 1 으로 이진화한다 . ( 마스크 생성 )4. 마스크와 RGB 영상을 곱한다 .5. 4 번 과정으로 만든 영상에 합성하고자 할 배경영상을 합성한
다 .
11 월 7 일 , 실습 예정
![Page 9: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/9.jpg)
Department of Computer Science and Engineering, Hanyang University
흑백의 영상 (gray scale) 을 사람이 볼 때 사물의 구별이 편하도록 임의의 색상으로 변환하는 기술을 말한다 .
가장 단순한 방법으로 gray scale 영상의 Intensity 값을 HSV 의 Hue 값에 매칭해서 변환하는 방법이 많이 쓰인다 .
Pseudo Color Conversion
![Page 10: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/10.jpg)
Department of Computer Science and Engineering, Hanyang University
Pseudo Color Conversion
![Page 11: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/11.jpg)
Department of Computer Science and Engineering, Hanyang University
Pseudo Color Conversion
![Page 12: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/12.jpg)
Department of Computer Science and Engineering, Hanyang University
Pseudo Color Conversion
![Page 13: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/13.jpg)
Department of Computer Science and Engineering, Hanyang University
Pseudo Color Conversion
![Page 14: Lecture Note - Image Processingmr.hanyang.ac.kr/wp-content/uploads/2012… · PPT file · Web view · 2012-11-07크로마 키 (Chroma key) Image Compositing. Image Compositing](https://reader035.vdocuments.pub/reader035/viewer/2022081505/5ad0c3407f8b9aca598e0cae/html5/thumbnails/14.jpg)
Department of Computer Science and Engineering, Hanyang University
Pseudo Color Conversion
1. Iplimage 변수를 3 개 채널 (HSV) 로 생성한다 .2. Iplimage 변수를 1 개 채널로 3 개 (H, S, V) 를 생성한다 .3. Pseudo Color Conversion 할 영상을 gray scale 로 불러온 후 ,
최대 , 최소값을 구한다 .4. 불러온 영상의 intensity 값을 0~255 로 정규화 시킨다 .5. 정규화 된 영상을 H 변수에 대입한다 .6. H, S, V 영상을 HSV 영상으로 결합한다 .7. HSV 영상을 RGB 영상으로 변환한다 .
11 월 7 일 , 실습 예정