Step Projection-Based Spread Transform Dither Modulation

li Xinchao; Liu Ju; Sun Jiande; Sun Zhaowan; Yang Xiaohui

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Step Projection-Based Spread Transform Dither Modulation

li Xinchao #,Liu Ju *,Sun Jiande ,Sun Zhaowan ,Yang Xiaohui

School of information science and engineering,Shandong University

*Correspondence author

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Funding: 教育部博士点基金,山东自然科学基金,山东优秀中青年科学家基金,国家自然科学基金,科技创新重大项目培育资金（No.200804221023,Q2008G03,2007BS01023,60872024,708059）

Opened online:26 October 2009

Accepted by: none

Citation: li Xinchao ,Liu Ju ,Sun Jiande .Step Projection-Based Spread Transform Dither Modulation [OL]. [26 October 2009] http://en.paper.edu.cn/en_releasepaper/content/36114

Quantization Index Modulation is an important class of watermark methods, which has been widely used in blind watermark applications. And it is well known that spread transform dither modulation (STDM), as an extension of QIM, has good performance in robustness to random noise and re-quantization. However, the quantization step sizes used in STDM are random numbers which didn’t take the image’s feature into account. In this paper, we proposed a step projection-based STDM algorithm, which applies a novel way to incorporate the modified perceptual model with STDM framework. Experimental results indicate that our proposed scheme fixes up the weakness of the original STDM, the excessive sensitivity to valumetric scaling, successfully. Meanwhile, the robustness of STDM to Salt&Pepper Noise has been improved by a large scale. Compared with the former proposed modified schemes of STDM, our proposed scheme has considerable advantages, especially on robustness to random noise and JPEG compression.

Keywords:STDM;Step-Projection;Quantization Index Modulation;Perceptual Model

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