Abstract

We present a precise Monte Carlo simulation of speckle reduction on the natural test image, which will serve as a digital image embedded with speckle under control. In simulating the conditioned time averaging for the square modulus of the random phasor sum in speckle reduction by a moving diffuser, after initial upconversion of the test image amplitudes, downconversion of their product with an independent set of time-varying, random phasors is repeated to sum up the square moduli. Validity of the simulation is rigorously confirmed on the test image array consisting of random real amplitude. As a more practical digital test image for speckle evaluation, the well-known Lena test image is promising as the standard for this application from the point of view of sufficiently small excess noise, primarily due to low pixel–neighbor correlations.

© 2015 Optical Society of America

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