给出了一种阈化处理激光散斑光强多灰度值分布(如256级灰度)的方法。采用此种处理方法, 激光散斑的功率谱强度随空间频率的分布保持不变, 而计算机存贮散斑图样所需的存贮空间可极大地减少。针对具体的圆形和环形散射屏引入的散斑图样, 采取使处理前后的功率谱偏差最小的方法, 找出了最佳的阈值。

This paper presents a method of intensity thresholding for the laser speckle patterns of multi gray levels (for example 256 levels). After this thresholding operation, the main features of the spacial frequency power spectral density of laser speckle intensity are maintained and the amount of computer digital storage space can be reduced greatly. An optimum threshold level is found that minimizes distortion of the power spectrum for speckle data of the circular and ring apertures.