Quantization analysis of speckle intensity measurements for phase retrieval

Abstract

Speckle intensity measurements utilized for phase retrieval (PR) are sequentially taken with a digital camera, which introduces quantization error that diminishes the signal quality. Influences of quantization on the speckle intensity distribution and PR are investigated numerically and experimentally in the static wavefront sensing setup. Results show that 3 to $4\text{bits}$ are adequate to represent the speckle intensities and yield acceptable reconstructions at relatively fast convergence rates. Computer memory requirements may be eased down by 2.4 times if a $4\text{bit}$ instead of an $8\text{bit}$ camera is used. This may facilitate rapid speckle data acquisition for dynamic wavefront sensing.

© 2010 Optical Society of America

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