光照不均匀图像的频域增强方法  

Enhancement and adjustment for non-uniform illumination image based on frequency domain

作　　者：陶胜[1] TAO Sheng(Jimei University,Xiamen 361021 China)

机构地区：[1]集美大学理学院,福建厦门361021

出　　处：《新余学院学报》2020年第1期12-15,共4页Journal of Xinyu University

摘　　要：为了提高光照不均匀图像的视觉效果,采用频域同态滤波处理使得图像偏暗部分得到增强,给出了相关参数的确定方法。在此基础上,探讨在频域利用多尺度高斯滤波器实现图像增强。首先对图像作对数变换,再进行傅立叶变换,然后采用高斯滤波器进行滤波,最后进行逆傅立叶变换以及逆运算得到增强图像。对于真彩色图像,由RGB空间转换到HSV空间进行处理。仿真实验结果表明,对于光照不均匀的图像,采用频域同态滤波方法,能够取得较满意的视觉效果。In order to improve the visual effect of the non-uniform illumination image,the frequency domain homomorphism filtering is used to enhance the darkening part of the image,and the determination method of related parameters is given.On this basis,the image enhancement is discussed by using multi-scale Gaussian filter in frequency domain.Firstly,logarithmic transformation of the image is made;secondly,Fourier transform is carried out;thirdly,Gaussian filter is used to filter;and finally the enhanced image is obtained by inverse Fourier transform and inverse operation.For true color images,the RGB space is converted to HSV space for processing.The simulation results show that the frequency domain homomorphic filtering method can achieve satisfactory visual effects for images with uneven illumination.

关 键 词：光照不均匀图像 傅立叶变换 频域同态滤波 图像增强 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]