图像对比度增强的小波变换法  

Contrast Enhancement for Image by Wavelet Transform

作　　者：陈会羽[1] 

机构地区：[1]浙江师范大学信息科学与工程学院,浙江金华321004

出　　处：《计算机工程与应用》2006年第25期66-68,共3页Computer Engineering and Applications

摘　　要：提出一种基于离散正交小波变换和非线性增益的图像对比度增强方法。对图像进行离散正交小波变换后,对分辨率较好的各高频子带直接利用所提出的去噪方法去噪;对分辨率较差的各高频子带利用所提出的非线性增益法结合文中的去噪法进行增强。实验结果表明,论文提出的方法在有效地增强图像对比度的同时,又能很好地抑制图像中的白噪声。算法在视觉质量上优于传统的反锐化掩膜法、直方图均衡法。A kind of image threshold de-noising and enhancement method based on discrete orthogonal wavelet transform and non-linear gain is given.After making discrete orthogonal wavelet transform to an image,de-noising is done by the method given in the high frequency subbands which is in the better resolution levels and enhancement is done by combining denoising method with non-linear gain method in the high frequency subbands which is the worse resolution levels.According to the result of experiment,the given algorithm can reduce the noise of image effectively while it also enhances the contrast of image well.In visual quality,the algorithm is better than the traditional unshaped mask method,histogram equalization method.

关 键 词：离散正交小波变换 广义交叉确认 阈值去噪 对比度增强 非线性增益 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构] TP391[自动化与计算机技术—计算机科学与技术]