改进Retinex算法的光照不均匀图像增强研究  

Improved Retinex algorithm for image enhancement with uneven illumination

作　　者：苏康友 王晓刚[2] 柳革命 SU Kangyou;WANG Xiaogang;LIU Geming(Guangdong Baiyung University,Guangzhou 510450,China;College of Mechanical and Electronic Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广东白云学院电气与信息工程学院,广州510450 [2]广州大学机械与电气工程学院,广州510006

出　　处：《激光杂志》2022年第9期103-108,共6页Laser Journal

基　　金：广东省教育厅研究项目(No.2018KQNCX296);广州市科技计划项目(No.202002030230)。

摘　　要：为了提高图像增效果,消除光照不均匀的干扰,提出了改进Retinex算法的光照不均匀图像增强方法。通过引入颜色恢复因子调节三原色比例关系,调整图像三原色通道内的像素数值,控制反射图像输出像素值区间,完成颜色反转处理;通过直方图拉伸方式拉伸增强后的图像,利用Gamma校正方式替换直方图拉伸时的线性映射,提升增强后的图像对比度。实验结果表明:该方法的增强处理过程中增益调整匹配效果更好且稳定,始终在95%上下浮动,能够在2 s内完成图像增益调整,实现图像增强等特点,在图像颜色反转、颜色增强处理方面效果尤为显著。In order to improve the image enhancement effect and eliminate the interference of uneven illumination,an image enhancement method based on improved Retinex algorithm is proposed.By introducing the color restoration factor,the proportional relationship of the three primary colors is adjusted,the pixel value in the three primary color channel of the image is adjusted,and the output pixel value range of the reflected image is controlled to complete the color inversion process;The histogram stretching method is used to stretch the enhanced image,and the gamma correction method is used to replace the linear mapping when the square graph is stretched,so as to improve the contrast of the enhanced image.The experimental results show that the gain adjustment matching effect of this method is better and stable,always floating up and down at 95%,and can complete the image gain adjustment within 2 s to realize image enhancement.The effect is particularly significant in image color inversion and color enhancement.

关 键 词：改进Retinex 光照不均匀 图像增强 直方图 恢复因子 增益调整 

分 类 号：TN201[电子电信—物理电子学]