基于小波的同态滤波算法在ICT图像增强中的应用  

ICT Image Enhancement by Wavelet Based Homomorphic Filtering Method

作　　者：郑东梅[1] 石俊生[1] 宋晓辉 戴正国 韦宏强 于明飞[3] 

机构地区：[1]云南师范大学 [2]63867部队 [3]93313部队

出　　处：《长春理工大学学报（自然科学版）》2007年第3期44-46,共3页Journal of Changchun University of Science and Technology(Natural Science Edition)

摘　　要：针对ICT图像对比度低、边缘模糊、细节不清晰等问题,提出采用基于小波的同态滤波算法来对图像进行增强。同态滤波可以有效地减少亮度不均匀,并对感兴趣的景物进行有效增强。首光使用基于照明反射模型的同态滤波方法,介绍模型的原理、实现过程和特点,给出了适用的滤波模型和表达式。引入基于小波变换的同态滤波方法,采用高通滤波对小波变换系数进行处理,在保持图像总体原貌的基础上对图像局部对比度增强,效果显著。A new spatial frequency analysis method based on wavelet was applied to homomorphic filtering to enhance the contrast of ICT image. In order to attenuate the low spatial frequencies and amplify the high spatial frequencies, the wavelet analyzing coefficients are processed by a high-pass filter.So the local uneven distribution due to light source nonuniformity can be reduced and the object feature can be emphasized. Experiments indicated that the method performs well in enhancing the local contrast while maintaining its global appearance.

关 键 词：ICT图像 小波变换 同态滤波 图像增强 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]