Speckle noise removal in interference fringes by optoelectronic preprocessing with Epson liquid crystal television

Bertrand Trolard; Christophe Gorecki; Gilbert M. Tribillon

doi:10.1117/12.276298

17 July 1996 Speckle noise removal in interference fringes by optoelectronic preprocessing with Epson liquid crystal television

Bertrand Trolard, Christophe Gorecki, Gilbert M. Tribillon

Author Affiliations +

Proceedings Volume 2860, Laser Interferometry VIII: Techniques and Analysis; (1996) https://doi.org/10.1117/12.276298
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

An optical implementation of real-time preprocessing of interference fringes is demonstrated using Epson light crystal television (LCTV) working as a spatial matched filter in an optical correlation setup. Two methods of optical smoothing for speckle noise removal using both the hybrid modulations of the LCTV were studied. One of these methods is based on the diffraction properties of a sinusoidal phase grating addressed on the modulator. The second one is a global filter operating like a transparency to eliminate speckle spectral components in the input image spectrum. Preliminary results are illustrated by representative examples.

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Bertrand Trolard, Christophe Gorecki, and Gilbert M. Tribillon "Speckle noise removal in interference fringes by optoelectronic preprocessing with Epson liquid crystal television", Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996); https://doi.org/10.1117/12.276298

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