摘要
传统水下主动激光扫描系统采用普通相机对反射光接收记录,反射激光点被掩埋在背景噪声中无法分离,影响成像质量。该文在水下激光主动扫描成像系统中采用光场相机记录了包括激光反射光线和各种散射背景杂光的位置和方向信息,为抑制散射背景杂光提供了可能。在后续光场记录图像处理中,首先,对记录的光场图像进行前后两次重聚焦,第一次是对激光照射到物面激光光点的重聚焦,第二次是对激光光点前景散射光的重聚焦,再对两幅图像进行差分处理;提出一种计算机自动判断流程,使得差分所得图像上激光点的衬度最大,或足够大。实验结果表明,上述方法可以达到较好的散射背景抑制作用,是对现有同步扫描主动激光成像系统空间分离散射背景抑制技术的必要补充。
The traditional underwater active laser scanning system uses ordinary camera to receive and record reflected light.The reflected laser point is buried in the background noise and cannot be separated,which affects the image quality.In this paper,the position and direction information of laser reflected light and scattered background stray light are recorded by light field camera in underwater laser active scanning imaging system,providing the possibility to suppress scattering background stray light.In the subsequent processing of light field recording image.Firstly,the recorded light field images are refocused twice.The first is the refocusing of the laser light spot on the object surface and the second is the refocusing of the scattered light in the foreground of the laser light spot.Then,the differential processing is applied to the two refocusing images,and a computer automatic judging process is proposed to make the contrast of laser point on the differential image maximum or large enough.The experimental results show that the above method can effectively suppress the scattering background,and it will be a necessary supplement to the existing space separation scattering background suppression technology of synchronous scanning active laser imaging system.
作者
吉勇
屠大维
张旭
李晨
Ji Yong;Tu Dawei;Zhang Xu;Li Chen(School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China;School of Mechatronic Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《电子测量与仪器学报》
CSCD
北大核心
2020年第5期58-64,共7页
Journal of Electronic Measurement and Instrumentation
基金
国家重点研发计划课题(2016YFC0302401)
国家自然科学基金(61673252)资助项目。
关键词
主动激光扫描
散射背景分离
光场成像
重聚焦
差分
active laser scanning
scattering background separation
light field imaging
refocusing
difference
