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Contrast of laser speckle images using some modulated apertures

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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.

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Hamed, A.M. Contrast of laser speckle images using some modulated apertures. Pramana - J Phys 95, 122 (2021).

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