The second generation curvelet theory adopted a new framework which had the reduction parameter and the simple realization. It had two fast numerical implementations. The first digital transformation was based on unequally-spaced fast Fourier transform while the second was based on the wrapping of specially selected Fourier samples. To meet the large image watermark, this paper designed a fast watermark algorithm according to the characteristics of the fast curvelet algorithm and the human visual. The experimental results demonstrate that the digital image watermark algorithm based on either the usfft algorithm or the wrapping algorithm all ensures a fine unification of robustness and invisibility, and the digital image watermark algorithm based on wrapping algorithm is more significant in improving the running speed.
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毕杨. 基于快速曲波变换的数字水印算法[J]. 科学技术与工程, 2011, (19): . biyang. Digital Image Watermark Algorithm Based on the Fast Curvelet Transform[J]. Science Technology and Engineering,2011,(19).