中文摘要：

提出了一种基于小波变换的能有效抵抗随机弯曲攻击的有意义数字水印算法。该算法应用双二次几何变换及其逆变换矫正被随机弯曲攻击的水印图像，能很好地抵抗各种程度随机弯曲的攻击，从而彻底解决了数字水印抵抗随机弯曲攻击这一在数字水印研究领域的难题；检测水印时，不需要原始水印图像，从而实现了水印信息的盲检测。实验结果表明，当水印图像被弯曲到了视觉效果很差的情况下，利用该算法仍能正常检测出隐藏的水印信息。另外，该算法还可以较好地抵抗一般的信号处理攻击。

英文摘要：

This paper presents a watermarking algorithm based on DWT（Discrete Wavelet Transform）,this algorithm can resist Random bend distortion very well.This algorithm applies biquadratic transformation and inverse transformation to correct attacked watermarking image by Random bend,which can resist all kinds of Random bend distortion,so we solve a very difficult question in the watermarking fields;The original image is not required for extracting the watermarking,so this algorithm is blind watermarking one.The experimental results show when images watermarking embedded are bended to random degree,watermarking information can be checked very well by using this algorithm. Besides,the watermarking information generated with the presented algorithm is robust against the common signal processing attack,