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Optimizing the parameters for measuring laser speckle and speckle contrast

机译：优化用于测量激光斑点和斑点对比度的参数

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Evaluating the contrast in speckle patterns produced by laser projection displays can facilitate the development of methods to suppress such imperfection. Computer simulations were first conducted to characterize the contrast (C_(gs)) of fully developed speckle patterns with spatial factor k and power factor r. Results showed that 0.1 ≤ r ≤ 2.0 and k ≥ 4.0 were required to obtain a C_(gs) with less than 5% error. Experimental results, however, revealed that a power factor within the range 0.5 ≤ r ≤ 2.0 was needed, meaning that the speckle dimension was at least four times the pixel pitch and the largest speckle intensity was of the order of magnitude of the saturation level of the camera. The method proposed here is that the spatial factor be determined by adjusting the distance between the object and the camera, and the power factor be determined by monitoring the real-time histogram representing the speckle pattern.
机译：评估由激光投影显示器产生的斑点图案的对比度可以促进开发抑制这种缺陷的方法。首先进行计算机模拟，以表征具有空间因数k和功率因数r的完全显影斑点图案的对比度（C_（gs））。结果表明，要获得误差小于5％的C_（gs），需要0.1≤r≤2.0和k≥4.0。然而，实验结果表明，需要在0.5≤r≤2.0范围内的功率因数，这意味着散斑尺寸至少是像素间距的四倍，最大散斑强度约为饱和度的数量级。相机。在此提出的方法是，通过调整物体与摄像机之间的距离来确定空间因素，并通过监视代表斑点图案的实时直方图来确定功率因数。

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