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基于预测误差差值扩展的彩色图像可擦除水印 被引量:3

Erasable watermark algorithm based on prediction error difference expansion of color components
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摘要 将Tian差值扩展技术应用于彩色图像,提出一种基于预测误差差值扩展的彩色图像可擦除水印算法。该算法将更小的差值扩展量分散到2个色彩分量中,同时用直方图修改法嵌入辅助信息,嵌入点由不可扩展差值的数量自适地确定。水印信号和嵌入位置由密钥决定,双密钥机制使水印更加安全。实验表明,该方法嵌入的水印不可见性好,在擦除水印后能无损地恢复原始图像。 A new erasable watermark algorithm based on prediction error difference expansion of color components is proposed.The algorithm disperses smaller expansion to two components,and utilizes the histogram modification to embed additional information.The embeded point is determined by the quantity of unexpandable difference.The keyword is used to determine the watermark signal and embedding position,and the keyword mechanism can assure very good security for the watermark.The experiments show that the algorithm can assure good imperceptibility for watermarked image and the image can be restored losslessly after the watermark is erased.
出处 《光电子.激光》 EI CAS CSCD 北大核心 2010年第1期107-111,共5页 Journal of Optoelectronics·Laser
基金 国家民委重点科研基金资助项目(MZY02004)
关键词 可擦除水印 预测误差差值扩展 色彩分量 直方图修改 erasable watermark prediction error difference expansion color components histogram modification
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