METHOD FOR DETECTING A PERSPECTIVELY DISTORTED POLYGONAL STRUCTURE IN AN IMAGE OF AN IDENTIFICATION DOCUMENT

摘要

The invention relates to a method for detecting a perspectively distorted polygonal structure in an image of an identification document, comprising detecting (301) edges in the image in order to obtain an edge image, detecting (303) a plurality of polygonal edge structures in the edge image, determining (305) metrics for each polygonal edge structure, and selecting (307) that polygonal edge structure which has the greatest metrics as the perspectively distorted polygonal structure.