Optical implementation of the generalized Hough transform with totally incoherent light
Ariel Fernández, Julia R. Alonso, Gastón A. Ayubi, Matías Osorio, José A. Ferrari · Optics Letters · 2015
The generalized Hough transform is a well-established technique for detecting complex shapes in images containing noisy or missing data. We present an efficient optical implementation of this transform using an electrical lens with variable focal length and a rotating pupil mask matching the pattern to be found. The proposed setup works under fully (i.e., both spatially and temporally) incoherent illumination and can handle orientation changes or scale variations in the pattern. Validation experiments showing its real-time application are presented.