激光散斑参量与探测角度之间关系的研究  

Relation Between Different Detective Angles and Parameters of Laser Speckle

作　　者：王建新[1] 周晨波[1] 于文英[1] 许泓彧[1] 

机构地区：[1]烟台大学光电信息科学技术学院,山东烟台264005

出　　处：《烟台大学学报（自然科学与工程版）》2005年第2期108-112,共5页Journal of Yantai University(Natural Science and Engineering Edition)

基　　金：国防科技重点实验室基金资助项目(98JSSO.3.1.QT0707).

摘　　要：研究了激光散斑参量与探测角度之间的关系.实验和计算研究表明:对同一种实验样品粗糙表面,由于入射探测角度不同而导致激光散斑CCD图像的各种参量诸如对比度、熵、能量和平均值等都有不同的结果.通过对最大直方图熵阈值分割法的二值化图像的分析,可以得到随着角度的增大,CCD散斑图像中的斑点直径整体呈现变小趋势,而且斑点的分布趋于均匀的结果.此研究结果对于利用CCD获取激光散斑图像的各种测量技术参量分析非常有用.The relation between the detective angles and the parameters of laser speckle have been presented. The experiments and calculations indicate the parameters with CCD images such as speckle contrast, entropy, energy and average value have different results due to the different forms of the detective angles. The analysis with maximal histogram can obtain a result that the average diameter of spots dotted in laser speckle pattern tends to be smaller with the angle increasing and the spots’ distribution appear to be more uniform.It is shown the results are useful to analyze the images capturing by CCD in some measurements.

关 键 词：散斑对比度 熵 最大直方图熵阈值分割法 能量 方差 

分 类 号：O437[机械工程—光学工程]