Unlock instant, AI-driven research and patent intelligence for your innovation.

Robust zero-watermarking algorithm against dual print-and-scan based on direct coefficient comparison

A technology of secondary printing and DC coefficient, applied in the fields of information security and document anti-counterfeiting, can solve the problems of signal processing attacks, etc., and achieve the effect of strong resistance to secondary printing-scanning ability

Inactive Publication Date: 2012-07-25
ZHEJIANG GONGSHANG UNIVERSITY
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to design a zero-watermark generation and extraction method based on a DC coefficient comparison-based anti-secondary printing-scanning robust zero-watermark algorithm, to solve the problem of resisting secondary printing-scanning and overcoming the transmission of digital images after printing-scanning The process further suffers from some signal processing attacks

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Robust zero-watermarking algorithm against dual print-and-scan based on direct coefficient comparison
  • Robust zero-watermarking algorithm against dual print-and-scan based on direct coefficient comparison
  • Robust zero-watermarking algorithm against dual print-and-scan based on direct coefficient comparison

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0055] 1 Influence of print-scan on the relationship between the DC coefficient values ​​of two adjacent sub-blocks in the wavelet low-frequency approximation sub-band

[0056] Taking Baboon, a 512×512 256-gray-level image, as an example, the influence of a print-scan on the value relationship of the DC coefficients of two adjacent sub-blocks is investigated. image 3 and Figure 4 They are the original Baboon image and the Baboon image after one print-scan and post-processing. The three-level harr wavelet base DWT is performed on the image, and the low-frequency approximation sub-band is divided into 4×4 sub-blocks that do not overlap each other, and DC coefficients are generated by DCT for each sub-block.

[0057] Figure 5 is the sign distribution of the difference between the DC coefficients of two adjacent sub-blocks in the original Baboon image wavelet low-frequency approximation sub-band, Figure 6 It is the positive and negative sign distribution of the DC coefficie...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A digital watermarking technology-based document anti-counterfeiting system is to print and scan a document image at a document production end and a document authentication end; and printing and scanning is the main test of robustness of a watermarking algorithm. The invention provides a zero-watermarking production and extraction method based on a robust zero-watermarking algorithm against dual print-and-scan of direct current coefficient comparison. By the algorithm, the image is subjected to discrete wavelet transform, a low-frequency approximation subband is divided into mutually nonoverlapping subblocks, each subblock is subjected to discrete cosine transform, and a zero-watermarking sequence is generated by comparing a numerical relationship between direct coefficients of two adjacent subblocks. Test results prove that the invention has strong anti dual print-and-scan ability, and may overcome the problem that digital images after the print and scan are further subject to treat and attack by some signals during the transmission process, and may be applied to the document anti-counterfeiting field.

Description

technical field [0001] The invention relates to the field of information security. The present invention designs a zero-watermark generation and extraction method based on a DC coefficient comparison-based anti-secondary printing-scanning robust zero-watermark algorithm, which has a strong ability to resist secondary printing-scanning, and can overcome digital printing-scanning The problem that the image is further subjected to some signal processing attacks during transmission can be applied to the field of document anti-counterfeiting. Background technique [0002] One of the functions of digital watermarking technology is to protect the copyright of works, which can be applied to the field of certificate anti-counterfeiting. The certificate anti-counterfeiting system based on digital watermarking technology can be described as follows: at the certificate production end, a digital camera takes pictures of people to form digital photos, and embeds the watermark information...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 叶天语
Owner ZHEJIANG GONGSHANG UNIVERSITY