面向舞台场景的改进Retinex低照度图像增强  

Improved Retinex low-light image enhancement for stage scenes

作　　者：季渊[1,2] 李星仪 马新德 廖亮 JI Yuan;LI Xingyi;MA Xinde;LIAO Liang(Microelectronics Research and Development Center,Shanghai University,Shanghai 200444,China;School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China;Shanghai Film Academy,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学微电子研究与开发中心,上海200444 [2]上海大学机电工程与自动化学院,上海200444 [3]上海大学上海电影学院,上海200072

出　　处：《光学精密工程》2023年第17期2573-2583,共11页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.61774101,No.61674100)。

摘　　要：针对舞台场景拍摄亮度动态范围受限问题,提出一种基于改进Retinex算法的舞台低照度增强方法。先对舞台场景的低照度图像采用改进的Retinex算法进行增强处理,得到整体增强后图像。将原图与增强后图像进行融合,处理掉过度增强和不需要增强的背景区域,得到最终图像。其中,改进的Retinex算法采用高斯-拉普拉斯高通滤波先求出反射分量后求出光照分量,解决反射分量细节丢失的问题。然后对反射分量进行对比度和细节增强处理,再与光照分量相乘得出增强后图像。本方法在软件平台验证的基础上进行FPGA硬件平台验证。实验结果表明,与其他经典方法相比,本方法在不同的舞台场景,尤其是明暗差距较大的舞台场景上,视觉效果明显,峰值信噪比(PSNR)平均提高了57.06%,结构相似性(SSIM)平均提高了27.34%。处理后的图像还原了舞台的真实亮度动态范围,并且色彩饱和度较好自然不失真,保证了较好的图像质量。To address the problem of limited luminance dynamic range in stage scenes,this study propos⁃es a method for low-light enhancement of the stage based on an improved Retinex algorithm.First,the low-light image of the stage scene is enhanced using the improved Retinex algorithm to obtain an overall enhanced image.Then,the original image is fused with the enhanced image,and background areas that are over-enhanced and do not need to be enhanced are processed to obtain the final image.The improved Retinex algorithm uses a Gauss-Laplace high-pass filter to find the reflected and illumination components,thus addressing the problem of detail loss in the reflection component.It then performs contrast and detail enhancement on the reflected component and multiplies it with the light component to produce the en⁃hanced image.This method performs field-programable gate array(FPGA)hardware platform verifica⁃tion based on software platform verification.The experimental results show that,compared with other classical methods,this method yields a noticeable visual improvement,with an average increase of 57.06%in peak signal-to-noise ratio(PSNR)and 27.34%in structural similarity(SSIM)in different stage scenes.This improvement is particularly significant in stage scenes with substantial differences in bright⁃ness between light and dark areas.The images processed by this method restore the true luminance dynamic range of the stage and exhibit good natural color saturation without distortion,ensuring better image quality.

关 键 词：图像融合 低照度增强 RETINEX算法 舞台场景 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术] TN873[自动化与计算机技术—计算机科学与技术]