关键词: GHM多小波, 模糊聚类, 数字水印

Abstract: An adaptive digital watermarking algorithm based on GHM and fuzzy clustering theory is presented.The wavelet blocks are classified by utilizing the energy of multiwavelet coefficients and important coefficients.According to the above results and the image local characteristics，a binary watermark is embedded into two correlated detail images adaptively in multiwavelet domain.The embedding process is repeated to improve the robustness of the watermark scheme.The watermark can be extracted without the original image.Experimental results indicate that the performance of the proposed watermarking is invisible and robust to common image processing operation，such as crop，JPEG compression and sharp etc.

Key words: GHM multiwavelet, fuzzy clustering theory, digital watermarking