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《Journal of Changzhou Institute of Technology》 2009-Z1
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Color Image Digital Watermarking Algorithm Based on DCT and DWT

LU Yu-guang1,2 GONG Sheng-rong1(1.School of Computer Science & Technology,Soochow University,Suzhou 215021;2.School of Computer & Information Engineering,Changzhou Institute of Technology,Changzhou 213002)  
A new algorithm with image digital watermarking based on DCT and DWT is proposed.The given color image is split into its three components in the YIQ color space firstly,then the luminance component Y is chosen and decomposed by two level DWT,the low frequency band is chosen and decomposed by DCT.According to the characteristics of Human Visual System(HVS),insensitive to the image′s texture and edges,the watermarking information is embedded into the larger energy blocks.Simulation result shows that the method is practicable with good robustness to shearing and geometric attacks.
【CateGory Index】: TP309.7
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