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Line sketch extraction using the Hough transform

Reliable schemes for line sketch extraction from gray scale images are investigated. It is often possible to recognize polyhedral objects in an image by capturing the linear features in the image and analyzing corner points. A line sketch is extracted from a gray scale image using the Hough transform (HT). The pixel points with their gradient directions and magnitudes are properly used for deciding the value of accumulation in Hough space. This leads to significant computational savings and robust results. The research presented in this report is concerned with utilizing HT and its derivatives to detect linear feature in images and constructing line sketches for higher level processing such as image representation, description and coding.