Quantization analysis of speckle intensity measurements for phase retrieval.
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 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 bit instead of an 8 bit camera is used. This may facilitate rapid speckle data acquisition for dynamic wavefront sensing.
Maallo
Anne Margarette S
AM
National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101, Philippines. marge.maallo@gmail.com
Almoro
Percival F
PF
Hanson
Steen G
SG