Automatic Evaluation of Lens Decentration
Georgi Gluhchev, Petya Pavlova, Anton Milev, Stefan Bonchev
Institute of Information Technologies, 1113 Sofia
Abstract: A method is described for real-time automatic processing of images obtained from a lens decentration evaluation device. For the initial localization of the centers of the autocollimation blics produced by the upper and bottom lens surfaces the Hough's transform for gray level images is applied. Better center localization is achieved using maximal gradient direction. Lens decentration measurement is based on the radii of the circles described by the centers of the auto collimation crosses.
Keywords: lens decentration, autocollimation, optical quality assurance, image processing.