Effects of intensity thresholding on the power spectrum of laser speckle

Alfred D. Ducharme, Glenn D. Boreman, Donald R. Snyder, Gerald C. Holst
1993 Infrared Imaging Systems: Design, Analysis, Modeling, and Testing IV  
Spatial-frequency filtering of laser-speckle patterns has proved to be a useful tool in the measurement of the modulation transfer function for focal plane arrays. Intensity thresholding of the laser-speckle patterns offers nearly an order of magnitude savings in digital storage space. The effect of this thresholding on the spatial-frequency power spectral density of the speckle pattern is investigated. An optimum threshold level is found that minimizes distortion of the power spectrum for the
more » ... lasses of speckle data used for modulation transfer function testing.
doi:10.1117/12.154734 fatcat:y4umf4qvc5cqfjmkakpab5srza