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

Optical implementation of the Hough transform by a matrix of holograms

P. Ambs, Sing H. Lee, Q. Tian, and Y. Fainman
Appl. Opt. 25(22) 4039-4045 (1986)

Optical Hough transform

William H. Steier and Raj K. Shori
Appl. Opt. 25(16) 2734-2738 (1986)

Parallel holographic generation of multiple Hough transform slices

Jeffrey Richards, Pieter Vermeulen, Etienne Barnard, and David P. Casasent
Appl. Opt. 27(21) 4540-4545 (1988)

Detection of a general ellipse by an optical Hough transform

L. Feng and Y. Fainman
Appl. Opt. 31(17) 3259-3262 (1992)

Coherent optical production of the Hough transform

George Eichmann and B. Z. Dong
Appl. Opt. 22(6) 830-834 (1983)