DOCUMENT IMAGE OUTPUT METHOD AND APPARATUS, TAMPERING JUDGING METHOD AND SYSTEM, AND PROGRAM FOR CONTROLLING TAMPERING JUDGING SYSTEM

摘要

PPROBLEM TO BE SOLVED: To easily detect a tampering even when printed matter is tampered. PSOLUTION: An image feature information extracting part 102 extracts image feature information from a document image. An image feature information embedding part 103 integrally applies the image feature information to a document as the original image feature information of the document, and a document image output part 104 outputs the documents as a print document 1. When the print document 1 is applied to a tampering judging apparatus 200 as a target document to be judged, that document image is read by a document image reading part 201. An image feature information extracting part 203 extracts the image feature information of the target document to be judged. An embedded information extracting part 202 extracts the original image feature information out of the image of the target document to be judged. A judgment part 204 compares the original image feature information and the image feature information of the target document to be judged and when a difference degree is beyond a prescribed range, the presence of the tempering in the target document to be judged is judged. PCOPYRIGHT: (C)2003,JPO