基于Piecewise直方图均衡化的图像增强方法  

Piecewise histogram equalization based image enhancement

作　　者：陈文飞[1] 廖斌[2] 许雪峰[3] 黄志勇[1] 董文永[1] 

机构地区：[1]武汉大学计算机学院,湖北武汉430072 [2]湖北大学数学与计算机科学学院,湖北武汉430062 [3]成都东软信息技术职业学院计算机科学与技术系,四川成都611844

出　　处：《通信学报》2011年第9期153-160,共8页Journal on Communications

基　　金：国家自然科学基金资助项目(60873114);中国博士后科学基金资助项目(20080440073)~~

摘　　要：提出了一种基于Piecewise直方图均衡化的图像增强方法,有机地结合了亮度拉伸和传统直方图均衡化的优点。通过定义直方图中相邻灰度级的距离,引入了一个基于直方图均值和标准偏差的Piecewise线性变换,探讨了图像过亮时Piecewise直方图均衡化参数的选取。实验表明,该方法的处理结果能有效避免现有的直方图均衡化方法中的"吞噬"问题和亮度饱和问题。在增强图像时不仅能保留细节,而且具有更加自然的视觉效果。Piecewise histogram equalization（Piecewise HE） was proposed,which combines the benefits of contrast stretching and existing histogram equalization.The swallow of saturation and brightness is avoided in the enhanced image by a piecewise linear mapping function,which combines with the mean and standard deviation of the histogram,and the parameters selection of Piecewise HE is explored when over-enhancement existed.The experimental results have demonstrated that the proposed method can enhance the images effectively,which avoids the swallow and over-enhancement problems of the existing histogram equalization methods.The proposed method not only preserves the original details,but also has a more natural visual effect in the enhanced image.

关 键 词：图像增强 直方图均衡化 分段线性均衡化 细节保留 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]