Image Contrast Enhancement based on Histogram Equalization of Sub-images
부분 영상 히스토그램 평활화를 이용한 영상 대비 향상
- 발행기관 아주대학교
- 지도교수 Dong-Yoon Kim
- 발행년도 2015
- 제출일 2015-01-05
- 학위수여년월 2015. 2
- 학위명 석사
- 학과 일반대학원 컴퓨터공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000019516
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Abstract This thesis presents a method to enhance the contrast of an image by applying histogram equalization to the sub-image. The histogram of the image was decomposed into parts with respect to the location of its peak. HE was run on the selected part of the image containing the peak intensity level while the other parts remained unchanged. Then, the equalized and unchanged parts of the histogram were combined into a single image. Having applied histogram equalization on the sub-images with various sizes on different locations, the images with the highest contrast value were chosen. According to the acquired results, histogram equalization was classified into seven groups by the size and location of the equalized part. Applying histogram equalization to the selected part of the image, where the peak is located, generated higher contrast. Qualitative and quantitative experimental results are shown. Key words: histogram equalization, contrast enhancement, image decomposition, image partition, sub-image.
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Table of Contents
ACKNOWLEDGEMENTS i
Abstract ii
Table of Contents iii
List of Figures iv
List of Tables v
LIST OF ACRONYMS vi
1.Introduction 1
1.1 Objective of Research 2
1.2 Methodology of Research 2
1.3 Organization of the Thesis 3
2. Related Work 4
3. Proposed Scheme 6
3.1. Overview 6
3.2. Computation of Histogram Equalization 8
3.3. Computation of Image Contrast 10
4. Experimental results 11
4.1. Numerical comparison 11
4.2. Statistical comparison 14
4.3. Image quality comparison 20
5. Conclusion and Future Work 25
REFERENCES 26
