Abstract

A modification of the optical Hough transformer [Appl. Opt. 25, 2734–2738 (1986)] is proposed. An input image is optically preprocessed to obtain an anamorphic magnified image. The anamorphic magnification leads to improved accuracy of the output plane parameter θ determination by means of a simple version of a Hough transformer. Then, the output signal is digitally postprocessed to obtain subpixel resolution in the ρ parameter dimension. A description of the method and the experimental results is presented.

© 1992 Optical Society of America

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