中文摘要：

为了克服水印鲁棒性和图像视觉质量之间的矛盾，提出了一种脊波变换域自适应盲水印算法．利用脊波变换对图像特征的稀疏表示特性，找出各区域块中视觉重要信息的位置，并将水印嵌入其中．算法中水印嵌入强度依据图像块的内容属性变化，采用了系数可容忍的最大误差作为水印嵌入强度因子，较好地解决了水印鲁棒性和图像视觉质量之间的矛盾,实验结果表明，该算法能够抵抗JPEG压缩、加噪和任意裁剪等攻击，具有很强的鲁棒性，是一种自适应盲水印算法．

英文摘要：

A blind digital waterrnarkin4g algorithm based on image content and ridgelet transform is proposed. Firstly, the image is divided into three different regions： smooth, edge and texture. And then, due to the sparse representation of ridgelet transform for image features, pc~itions of important vision information can be founded out, where watermarks are embedded. The watermark bits are inserted in the visual significant ridgelet coefficients without exceeding the strength of maximum allowable distortions of eoeffidents. The propee, ed algorithm solved the conflict of watermark robustness and perceptual invisibility. Experimental results the algorithm is robust against attacks such as JPEG, noise and random crop.