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《Journal of South China University of Technology(Natural Science Edition)》 2007-01
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Iterative Blending Algorithm Based on Error Correction of Sub Image

Xing Gui-hua Yu Sheng-lin (College of Automatic Engineering,Nanjing Univ.of Aeronautics and Astronautics,Nanjing 210016,Jiangsu,China)  
In order to improve the robustness of a watermark system,theoretical analyses and experiments are carried out to investigate the limitation and robustness in blending number of the existing iterative blending algorithm,demonstrating that the main reason for weak robustness is the multiplying of the image error many times.Furthermore,an iterative blending algorithm based on the error correction of sub image is proposed.In this algorithm,the sub images of the watermarked host image are modified by the sub images of the original host image,and several watermark images are embedded by the control of secret keys.The proposed algorithm is of strong robustness in resisting attacks with strong relativity.Especially,to cropping attacks,the error of the extracted watermark is appro-ximately zero,thus concluding that the proposed iterative blending algorithm is more robust than the original one.
【Fund】: “十五”“211工程”项目
【CateGory Index】: TP391.41
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