A Simple Histogram Modification Scheme for Contrast Enhancement

被引:66
作者
Chang, Yen-Ching [1 ]
Chang, Chun-Ming [2 ]
机构
[1] Chung Shan Med Univ, Dept Appl Informat Sci, Taichung 40201, Taiwan
[2] Asia Univ, Dept Informat Sci & Applicat, Taichung 41354, Taiwan
关键词
Histogram equalization; contrast enhancement; histogram specification; histogram modification; EQUALIZATION;
D O I
10.1109/TCE.2010.5505995
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Histogram equalization (HE) is a widely used contrast enhancement (CE) method in image processing applications. The algorithm can be easily implemented; however, it tends to transform the average brightness of an image toward the middle of the gray scale. In addition, unpleasant artifacts often appear in the enhanced images. In order to overcome these drawbacks, various HE-based methods which aim at specific issues were proposed. Some of them might overlook the problems inherent in the implementations of histogram equalization and histogram specification (HS). This paper presents a simple histogram modification scheme to solve those problems according to the characteristic of implementation. Two boundary values of the support of histogram are found and set to corresponding values, respectively. The probability density function of an image is then recomputed and the updated mapping function is used to perform histogram equalization. Experimental results show that the proposed approach can effectively improve the quality of images enhanced by histogram equalization and specification methods, and even histogram redistribution methods such as gray-level grouping (GLG).(1)
引用
收藏
页码:737 / 742
页数:6
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