Scientific Results

Non-Bayesian noise reduction in digital holography by random resampling masks

Year: 2013

Authors: Bianco V., Paturzo M., Memmolo P., Finizio A., Javidi B., Ferraro P.

Autors Affiliation: Istituto Nazionale di Ottica (INO-CNR), via Campi Flegrei 34, I-80078, Pozzuoli (Italy); Istituto Italiano di Tecnologia (IIT), L. Barsanti e Matteucci 53, I-80125, Naples (Italy): ECE Department, University of Connecticut, U-157, Storrs, Connecticut 06269, USA.

Abstract: Images from coherent laser sources are severely degraded by a mixture of speckle and incoherent additive noise. In digital holography, Bayesian approaches reduce the incoherent noise, but prior information are needed about the noise statistics. On the other hand, non-Bayesian techniques presents the shortcomings of resolution loss or very complex acquisition systems, required to record multiple uncorrelated holograms to be averaged. Here we propose a fast non-Bayesian method which performs a numerical synthesis of a moving diffuser in order to reduce the noise. The method does not depend on prior knowledge of the noise statistics and the proposed technique is one-shot, as only one single hologram capture is required. Indeed, starting from a single acquisition multiple uncorrelated reconstructions are provided by random sparse resampling masks, which can be incoherently averaged. Experiments show a significant improvement, close to the theoretical bound. Noteworthy, this is achieved while preserving the resolution of the unprocessed image.

Journal/Review: PROCEEDINGS OF SPIE

Volume: 8788      Pages from: 87883  to: 87883

KeyWords: Digital Holography; Image processing; Imaging; Multiple holograms; Speckle
DOI: 10.1117/12.2020865

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English