Abstract:

This paper proposes a watermarking algorithm based on curvelet transform.The algorithm embeds the watermarking information into coarse scale coefficient matrix of curvelet transform,and chooses reasonable embedding strength according to the requirement of watermarking robustness and imperceptibility for better watermark image imperceptibility.Due to the selection of low frequency coefficient embedding that presents most energy of the image,the performance is rather good in resisting JPEG compression,noise attack and median filtering attacks.The algorithm has strong robustness and meets the watermarking system imperceptibility and robustness requirements.

Key words: watermarking;curvelet transform;multiscale geometry