摘要： 提出基于图像小波变换与密钥相联系的数字水印技术。使用密钥把水印序列嵌入到不同的空域位置,通过小波变换,自适应的水印能嵌入到各层小波系数中。由于使用了多层结构的小波变换,小波系数划分为最低层逼近系数和中频子带系数。当水印嵌入时,修改小波变换最低层的高频分量。实验表明:这种算法对常规的干扰具有良好的不可见性和鲁棒性。

关键词: 数字水印, 密钥, 版权保护, 小波变换

Abstract: An image digital watermarking associated with the watermark key (a set of integer numbers) and based on discrete wavelet transform is proposed. With the watermark key, these watermarks are embedded in different spatial positions. Among which a wavelet transforms, a self-similar watermark is embedded into several levels of DWT coefficients. Using the multilevel structures wavelet transform , the lowest approximation coefficient and mid-frequency subbands coefficients are classified into two groups. While watermark is embeded, DWT's high frequency components of the lowest layer are modified. Experimental results show the algorithm is invisible and robust to certain common distortions.

中图分类号: 

• TP393.08