Eliminating the inclination of faxed images based on specific mark extraction: application of modified generalized Hough transform

摘要

This paper introduces a method for eliminating the inclination of faxed images. The angle of inclination is calculated by extracting the location of two specific marks (black rectangles) per page. The specific marks are distinguished from similar marks by modified generalized Hough transform that uses the number of white pixels surrounding black pixels and by measuring the relative position of other marks. An experiment using the proposed method finds that it can eliminate the inclination of faxed images up to the angle of 0.25°.