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Optical Engineering

Generation of a restored image from a video sequence recorded under turbulence effects
Author(s): Beny Cohen; Vadim Avrin; Moshe Belitsky; Its'hak Dinstein
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Paper Abstract

Turbulence conditions affect video images in two ways. They cause local blur, and they distort the geometry of the scene. A video sequence of a still scene recorded under turbulence appears to contain local random motion of small neighborhoods in the images. The blur is an accumulated result of the imaging point spread function and the local motion. The geometric distortion is due to the fact that small neighborhoods move in different directions. The restoration scheme reported takes care of the geometric distortion as well as the blur. The geometric distortion is reduced by averaging the gray levels of relatively long (a few hundred images) video segments. The averaging reduces the geometric distortion, but it increases the blur. The second stage is the estimation of the global point spread function. The blur in the average image is a combination of the effects of the imaging system transfer function, the turbulence, and the averaging of the sequence. The global nonisotropic point spread function is estimated based on edge responses in the average image. A Wiener filter is used for the restoration of the image. The presented experimental results are superior to the results obtained by a previously proposed majority-vote technique.

Paper Details

Date Published: 1 December 1997
PDF: 6 pages
Opt. Eng. 36(12) doi: 10.1117/1.601592
Published in: Optical Engineering Volume 36, Issue 12
Show Author Affiliations
Beny Cohen, Ben-Gurion Univ. of the Negev (Israel)
Vadim Avrin, Ben-Gurion Univ. of the Negev (Israel)
Moshe Belitsky, Impro-Temed Ltd. (Israel)
Its'hak Dinstein, Ben-Gurion Univ. of the Negev (Israel)

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