基于Matlab直方图技术的图像增强方法研究

Based on Matlab Software Image Histogram Enhancement Technique Research

直方图增强技术作为一种数字图像处理的重要手段已经得到越来越多的应用,研究以Matlab软件为基础,通过修改给定图像的直方图信息来增强图像效果,借助直方图均衡化和直方图规定化两种处理方式分别对暗调图像进行操作,采用了局部均衡和构造映射直方图两种直方图变换手段,对原始图像进行信息增强。实验结果表明,经对暗调灰度等级分离后的直方图均衡化技术大大改善了图像质量;经直方图规定化处理后的暗调图像能够展示原始图像的全部信息。两种技术均能显著地改善图像质量,增强图像细节特征,使图像变得更有层次。

Histogram enhancement technique as a means of digital image processing, has been widely utilization in many fields. Based on the Matlab software, the given image effect is improved by modifying the histogram information of the original image. This research applies the histogram equalization and histogram specification techniques to operate on dark tone image, and uses two methods of histogram transforming, partial equilibrium and structure mapping histogram to strength the original image information. The result shows that histogram equalization which is applied after the separation of dark tone image＇ s gray level can greatly improve the image quality, and his- togram specification that processed on dark tone image will make all features show. The research goes to the conclusion that histogram e- qualization and histogram specification techniques can significantly improve the image information, enhance the image features and make the image more hierarchical.