Markov speckle for efficient random bit generation.

Published

Conference Paper

Optical speckle is commonly observed in measurements using coherent radiation. While lacking experimental validation, previous work has often assumed that speckle's random spatial pattern follows a Markov process. Here, we present a derivation and experimental confirmation of conditions under which this assumption holds true. We demonstrate that a detected speckle field can be designed to obey the first-order Markov property by using a Cauchy attenuation mask to modulate scattered light. Creating Markov speckle enables the development of more accurate and efficient image post-processing algorithms, with applications including improved de-noising, segmentation and super-resolution. To show its versatility, we use the Cauchy mask to maximize the entropy of a detected speckle field with fixed average speckle size, allowing cryptographic applications to extract a maximum number of useful random bits from speckle images.

Full Text

Duke Authors

Cited Authors

  • Horstmeyer, R; Chen, RY; Judkewitz, B; Yang, C

Published Date

  • November 2012

Published In

Volume / Issue

  • 20 / 24

Start / End Page

  • 26394 - 26410

PubMed ID

  • 23187494

Pubmed Central ID

  • 23187494

Electronic International Standard Serial Number (EISSN)

  • 1094-4087

International Standard Serial Number (ISSN)

  • 1094-4087

Digital Object Identifier (DOI)

  • 10.1364/oe.20.026394