Printing anti-counterfeiting watermarking algorithm based on norm and norm mean comparison

Abstract

As presswork is applied in real life most widely, the anti-counterfeiting protection is increasingly demanded, but the printing-scanning process is a main obstacle in anti-counterfeiting protection of the presswork. The existing anti-counterfeiting digital watermarking algorithm is used to insert digital watermarks in original images, if the insertion strength of the watermark can not be well controlled, the further use of digital images can be seriously affected, and the anti-counterfeiting digital watermarking algorithm further lacks of research on the capability of resisting the secondary printing-scanning process. The invention provides a printing anti-counterfeiting watermarking algorithm based on norm and norm mean comparison, which comprises the steps of: carrying out the discrete wavelet transform to original images to divide a wavelet low-frequency appropriator subband into subblocks which are not overlapped with each other, carrying out singular value decomposition to reach subblock, and judging the relation between the singular value matrix norm of each subblock and the mean value of the singular value matrix norms of all subblocks to generate a zero watermark sequence. Experimental results show that the invention can resist the attacks of primary or secondary printing-scanning.

Description

technical field [0001] The invention relates to the field of information security. The invention designs a printing anti-counterfeiting watermarking algorithm based on the comparison of the norm and the norm mean value, and performs anti-counterfeiting protection on the printed matter. Background technique [0002] Printed matter is widely used in real life and has the need for anti-counterfeiting protection. During the production process of printed matter, printed matter often undergoes a print-scan process. The print-scan process becomes a major obstacle in the anti-counterfeiting protection of printed matter. Many researchers use robust digital watermarking technology to realize the anti-counterfeiting protection of printed matter. At present, there are still some deficiencies in the research of printed matter anti-counterfeiting technology: (1) There are few robust digital watermarking algorithms that are resistant to printing and scanning, and there is a lot of resea...

AI Technical Summary

Problems solved by technology

At present, there are still some deficiencies in the research of printed matter anti-counterfeiting technology: (1) There are still few robust digital watermarking algorithms that are resistant to printing and scanning, and there is a lot of research space

(2) The proposed anti-printing-scanning digital watermarking algorithms [1, 2, 3] all embed digital watermarks in the original image, but the embedding of the watermark will reduce the visual effect of the original image. If the embedding strength of the watermark is not well controlled, Can seriously affect the use of digital images

(3) The proposed anti-print-scan digital watermarking algorithm [1, 2, 3] only studies the ability to resist one print-scan, but it needs to be able to resist the second print-scan in multiple printing occasions, so there is Necessary to study the ability to resist double printing-scanning

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