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.

Date Published: 17 July 1996
PDF: 9 pages
Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996); doi: 10.1117/12.276298

Published in SPIE Proceedings Vol. 2860:
Laser Interferometry VIII: Techniques and Analysis
Malgorzata Kujawinska; Ryszard J. Pryputniewicz; Mitsuo Takeda, Editor(s)