基于FPGA的低照度环境下激光图像增强研究  

Research on laser image enhancement under low illumination environment based on FPGA

作　　者：王永杰[1] WANG Yongjie(College of Information and Engineering,Guilin University of Technology,Guilin Guangxi 541004,China)

机构地区：[1]桂林理工大学信息科学与工程学院,广西桂林541004

出　　处：《激光杂志》2021年第5期68-72,共5页Laser Journal

基　　金：广西中青年教师基础能力提升项目(No.2018KY0251)。

摘　　要：研究基于FPGA的低照度环境下激光图像增强方法,提升增强激光图像准确性与处理效率。通过设计FPGA核心处理器增强激光图像,在FPGA内引入中值滤波方法,去除激光图像的脉冲噪声与椒盐噪声,突出激光图像细节信息,增强激光图像清晰程度;在FPGA内引入双直方图均衡方法,通过分割阈值的双直方图均衡化激光图像增强算法,避免出现过度增强现象,最大程度保留原始激光图像细节信息,提升激光图像增强处理质量,加快处理效率。实验证明:所研究方法能够有效提升低照度环境下激光图像的6个客观指标,最大程度地保留原始激光图像细节信息,提升低照度环境下激光图像增强的准确性;还能提升处理效率,具有较好的实时性。The laser image enhancement method based on FPGA in a low illumination environment was studied to improve the accuracy and processing efficiency of enhanced laser image.By designing an FPGA core processor to enhance laser image,the median filtering method was introduced in FPGA to remove the laser image’s pulse noise and salt noise,highlight laser image detail information,and enhance laser image clarity.The histogram equalisation method was introduced in FPGA.The histogram equalisation laser image enhancement algorithm with segmentation threshold was adopted to avoid excessive enhancement,retain the original laser image details to the maximum extent,improve the laser image enhancement processing quality and speed up the processing efficiency.The experimental results show that the proposed method can effectively improve the six objective indexes of laser images under a low illumination environment,retain the original laser image details to the greatest extent,and improve the enhanced accuracy of laser images under a low illumination environment.It can also improve processing efficiency and has better real-time performance.

关 键 词：FPGA 低照度环境 激光图像 图像增强 中值滤波 双直方图均衡 

分 类 号：TN911.73[电子电信—通信与信息系统]