A new transform filtering method for image homogenization. Application to characters retrieval in optical reading

摘要

This article deals with images of nearly periodic structures represented byudpapers'view with dark characters on clear background . The originaludpicture often comprises reflexion heterogeneousnesses or sheet flatnessudlacking which make background level undulating . We propose a suitableudalgorithm to solve the background homogenization problem and to allowudan appropriate image segmentation . The algorithm follows from anudoriginal transform filtering approach which uses an off-centered gradientudand a sliding window highpass filter .