INFORMATION EMBEDDING APPARATUS, INFORMATION DETECTING APPARATUS, INFORMATION EMBEDDING/DETECTING SYSTEM, INFORMATION EMBEDDING METHOD, INFORMATION DETECTING METHOD, INFORMATION EMBEDDING/DETECTING METHOD, INFORMATION EMBEDDING PROGRAM, INFORMATION DETECTING PROGRAM, INFORMATION EMBEDDING/DETECTING PROGRAM AND RECORDING MEDIUM

摘要

PPROBLEM TO BE SOLVED: To provide methods, apparatuses and an information storage medium in which information is stably embedded on/detected from a print image particularly and a user is capable of knowing reliability of the detected information in relation to embedding/detecting information that a human being can not visually confirm, or can be difficult to visually confirm. PSOLUTION: An apparatus for embedding information into a document image having a character area therein includes a character area detecting means for detecting the character area from the image, a character area dividing means for dividing the character area into a plurality of small areas, and a feature amount increasing/decreasing means for applying operation on each small area to increase/decrease its feature amount to a value determined from a pseudo random sequence by predetermined rules. PCOPYRIGHT: (C)2006,JPO&NCIPI