Adaptive Spread-Transform Dither Modulation Using a New Perceptual Model for Color Image Watermarking

Edited and published by : The Institute of Electronics, Information and Communication Engineers Produced and listed by : Sanbi Printing Co.,Ltd. 1) Guangdong Key Lab of Wireless Network and Terminal, School of Electronic and Information Engineering, South China University of Technology 2) Ericsson Mobile Data Applications Technology R&D (Guangzhou) Co., Ltd. 3) School of Electrical and Electronic Engineering, Nanyang Technological University 4) National Lab of Patt. Recog. Institute Automation, China Academy of Science watermarking strength (more particularly, the quantization index step size) to the whole cover image, and (ii) it is fairly vulnerable to the amplitude changes. To tackle the above challenges, an (ASTDM) approach is proposed in this paper for conducting robust color image watermarking by incorporating a new perceptual model into the conventional STDM framework. The proposed approach exploits a new perceptual model to adjust the quantization index step sizes according to the local perceptual characteristics of a cover image. Furthermore, in contrast to the conventional Watson's model is vulnerable to the amplitude changes, our proposed new perceptual model makes the luminance masking thresholds be consistent with any amplitude change, while keeping the consistence to the properties of the human visual system. In addition, certain color artifacts could be incurred during the watermark embedding procedure, since some intensity values are perceptibly changed to label the watermark. For that, a color artifact suppression algorithm is proposed by mathematically deriving an upper bound for the intensity values according to the inherent relationship between the saturation and the intensity components. Extensive experiments are conducted using 500 images selected from Corel database to demonstrate the superior performance of the proposed ASTDM approach. Edited and published by : The Institute of Electronics, Information and Communication Engineers Produced and listed by : Sanbi Printing Co.,Ltd. Source.


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