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

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概要

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• Major challenges of the conventional spread-transform dither modulation (STDM) watermarking approach are two-fold: (i) it exploits a fixed 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 adaptive spread-transform dither modulation (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 Watsons 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.

著者

• MA Lihong

  Guangdong Key Lab of Wireless Network and Terminal, School of Electronic and Information Engineering

• YU Dong

  Ericsson Mobile Data Applications Technology R&D (Guangzhou) Co., Ltd.

• WEI Gang

  Guangdong Key Lab of Wireless Network and Terminal, School of Electronic and Information Engineering

• TIAN Jing

  School of Electrical and Electronic Engineering, Nanyang Technological University

• LU Hanqing

  National Lab of Patt. Recog. Institute Automation, China Academy of Science

関連論文

• Adaptive Spread-Transform Dither Modulation Using a New Perceptual Model for Color Image Watermarking
• Adaptive Spread-Transform Dither Modulation Using a New Perceptual Model for Color Image Watermarking
• A Spatial Weighted Color Histogram for Image Retrieval (Pattern Recognition)
• A New Texture Feature Based on PCA Pattern Maps and Its Application to Image Retrieval
• Independent Component Analysis for Color Indexing(Pattern Recognition)

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