文章基本信息

标题：A Robust Tree Quantization Image Watermarking Technique Based on Qualified Significant Even Wavelet Tree (QSEWT)
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作者：B.Vijayakumar ; V.Vijayakumar ; Rajya Lakshmi 等
期刊名称：International Journal of Computer Science and Information Technologies
电子版ISSN：0975-9646
出版年度：2012
卷号：3
期号：2
页码：3714-3718
出版社：TechScience Publications
摘要：Recently to improve the compression of significance maps of wavelet coefficients, a new data structure called Wavelet Tree (WT) is introduced. The present paper extends the study on wavelet trees and developed new concept called Qualified Significant Even Wavelet Tree (QSEWT) to address the problem of 1) obtaining the best image quality for a given bit rate, and 2) to render the watermark more resistant to frequency based attacks, i.e., to achieve high robustness. This problem is important in many applications, particularly for progressive transmission, image browsing, multimedia applications and compatible transcoding in a digital hierarchy of multiple bit rates. It is also applicable to transmit over a noisy channel in the sense that the ordering of the bits in the order of importance leads naturally to prioritization for the purpose of layered protection schemes. Unlike other watermarking techniques which use a single casting energy, the proposed approach adopts adaptive casting energy in different resolutions. The experimental results indicate high robustness and image quality against various attacks when compared to several existing methodsre
关键词：Watermarking; Wavelet Tree; Robustness;Qualified Significant Even Wavelet Tree.otors.6