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Research on Image Digital Watermark Algorithm Based on Wavelet Transform

Author: ChangWenXia
Tutor: XiaoZhiYun
School: Inner Mongolia University of Technology
Course: Control Theory and Control Engineering
Keywords: Digital Watermarking Wavelet Transform Image Encryption EM algorithm
CLC: TP309.7
Type: Master's thesis
Year: 2009
Downloads: 125
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Abstract


Digital watermarking as an important application of information hiding technology makes it invisible digital information ( watermark ) is embedded in the multimedia information ( such as text , image , sound , video ) . The main purpose of the watermark processing technology order to protect the copyright of digital products or product proves the authenticity of personal information is hidden . Watermarked multimedia data , acting as a carrier must not be significantly degraded like , does not affect its use value . In this paper, a digital image encryption technology and image watermarking algorithm based on wavelet transform . Learning study of some of the classic algorithm , which pointed out the inadequacies and improved algorithm . First, the traditional picture digital encryption technology is the image of a given image by a certain scrambling algorithm into a chaotic , typically only one key for encryption processing by this method , its safety is poor . In this paper will be encrypted image with three auxiliary the image fusion scrambling encryption processing , this algorithm has three image key \Second, a wavelet domain image watermarking algorithm based on threshold classification vector image wavelet decomposition embedded area threshold classification , a different area of the embedded watermark embedding different embedding strength , the simulation results show that this algorithm the good invisibility and robustness . Third, an improved wavelet domain image watermarking algorithm , which is based on the maximum expected (EM) algorithm classified wavelet domain image watermarking algorithm . Embedded area classified by the EM algorithm for Gaussian mixture model , and encrypted watermark information in accordance with the characteristics of different classification layer embedded in the carrier image with the right intensity , embedded watermark image , thereby greatly enhancing the watermarking algorithm is not visibility and robustness.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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