Using the same diffuser, linear, quadratic and Hamming apertures can form static speckle images. The distribution of the obtained speckle images using modulated apertures is computed by examining the full width at half maximum (FWHM) of the autocorrelation function of the sampled speckle pattern. The FWHM results are compared with the results obtained with open circular aperture. In addition, the effects of the neighbourhood size over the computed speckle contrast are investigated as a function of speckle size.

中文翻译：

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使用一些调制孔径的激光散斑图像对比

使用相同的漫射器，线性、二次和汉明孔径可以形成静态散斑图像。使用调制孔径获得的散斑图像的分布是通过检查采样散斑图案的自相关函数的半高全宽 (FWHM) 来计算的。FWHM 结果与使用开放圆孔获得的结果进行比较。此外，邻域大小对计算散斑对比度的影响作为散斑大小的函数进行了研究。