Hough-transform system with optical anamorphic preprocessing and digital postprocessing
Carlos Ferreira, Antonio Moya, Tomasz Szoplik, Juan Domingo · Applied Optics · 1992
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 theta determination by means of a simple version of a Hough transformer. Then, the output signal is digitally postprocessed to obtain subpixel resolution in the rho parameter dimension. A description of the method and the experimental results is presented.