本文提出了一種基于小波變換的采用灰度圖像作為水印的盲水印算法，水印經過圖像置亂后，把水印分解成8 個二值位平面，選擇高4 位二值位平面嵌入到原始圖像的中頻子帶。實驗結論和攻擊測試表明，本文所提議的算法對JPEG 有損壓縮和加性噪聲等圖像攻擊有較強的魯棒性。
關鍵詞：數字水??；魯棒性；小波變換；灰度圖像；圖像置亂
Abstract ：A blind watermarking method based on wavelet transform is proposed in the paper, which selects a gray-level image as the watermarking.After be scrambled,the watermarking can be decomposed into eight binary images.The higher four binary images are embedded into the middle frequency coefficients of the original image.Experimental results and the testings of attacking prove that the method is robust enough to some image attacking processes such as JPEG compressing and adding noise.
Key words： digital watermarking；robustness；wavelet transform；gray-level image；image scrambling