关键词: 曲波变换, 人类视觉模型, 水印容量, 稳健性, EMD算法

Abstract: The basic principles of curvelet transform are described and human visual model based on curvelet transform for optimizing the robustness of watermarking technology is given.In addition，the EMD algorithm with unique and efficient embedding approach which can be used to keep great balance between the robustness and transparency of watermarking is adopted for improving the capacity of watermarks.The proposed algorithm can not only effectively deal with all types of conventional signal processing attacks，but also can prevent most of the malicious attacks on watermarks.Furthermore，as a result of the characteristics of curvelet transform，extracting and detecting processes in this algorithm do not require participation of the original watermark and the original images.It is an utterly blind watermarking algorithm.Finally，experimental results prove that the algorithm is improved markedly compared to some other robust watermarking methods based on transform domains.

Key words: curvelet transform, human visual model, capacity of watermarking, robustness, Exploiting Modification Direction（EMD） algorithm