摘要
A paper information anti-fake and tamper-proofing method based on human visual characteristics and morphol-ogy screen coding technology is proposed. Through controlling the distribution of mathematical morphology of screen dot-matrix,warning mark and information are hidden in the background texture. Because of the differ-ences between human vision and the duplicate characteristics of copy machine,warning mark which can not be discriminated by human eyes will emerge after copy. Tampered or fake certificates can be verified by compar-ing embedded information which is extracted from scanned image of certificate with plain text printed on the certificate. This method is applied in many bills and certificates. Experimental results show that the identifica-tion accuracy is above 98%
基金
key scientific and technological project foundation of Tianjin
