Document matching on CCITT Group 4 compressed images
Jonathan J. Hull · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1997
A method is proposed for detecting whether tow CCITT group 4 images were scanned from the same document. Features are extracted from rectangular patches of text and compared with a modified Hausdorff distance measure. Two images are said to be 'equivalent' if the Hausdorff measure finds that a specified number of features are located within a given distance of one another in both images. This paper explains the technique and presents experimental results that demonstrate its effectiveness.It is shown that features extracted from a one-inch square patch of image data provide better than 95 percent correct retrieval accuracy with no false positives on a database of 800 documents.