Research on Correction Algorithm for Print-Scan Resistant Digital Watermarking Algorithms Based on DWT

Abstract:

On the basis of the analysis of the second layer of DWT high amplitude coefficients before and after printing and scanning, we propose a correction algorithm for Print-scan resistant Digital Watermarking Algorithms Based on DWT. This correction algorithm corrects in the frequency domain, multiplying the coefficients by a correction coefficient and determining the best correction coefficient by Kolmogorov-Smirnov test. Contrast with two common methods to correct the distorted pixels: brightness transformation and contrast stretching transformation, this correction algorithm has the character of less calculation and takes the influence of print and scan on the surrounding pixels into account. At last, after applying it to several test images and all the NC values becoming bigger, the proposed correction algorithm is proved to be effective and universal.

• Periodical: Applied Mechanics and Materials (Volume 262)
• Pages: 172-176
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.262.172
• Online since: December 2012
• Authors: Zhen Jie Zhang, Zhen Liu, Hui Yu
• Keywords: Correction, Digital Watermarking, Discrete Wavelet Transform (DWT), Kolmogorov-Smirnov Test, Print-Scan Resistant

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