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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。
A method of thresholding multi-gray value distribution of laser speckle intensity (such as 256 gray levels) is given. With this approach, the power spectrum intensity of the laser speckle remains constant with the spatial frequency distribution, while the storage space required for computer-stored speckle patterns can be greatly reduced. According to the speckle patterns introduced by the specific circular and circular scattering screens, the best threshold is found by minimizing the power spectrum deviation before and after processing.