摘要
为了改善数字水印功能的单一性,基于离散余弦变换和离散小波变换的思想,提出一种双功能数字水印方法,通过嵌入鲁棒水印和脆弱水印来实现图像内容版权保护和图像认证的双重目的。实验结果表明:新算法利用小波变换的特点,在图像的低频部分嵌入鲁棒水印,能使其具有良好的鲁棒性;利用离散余弦变换在其高频部分嵌入脆弱水印,当遭受攻击或篡改时脆弱水印更易被损坏,从而可以达到图像认证的目的。
In order to improve the singleness of the digital watermarking function, based on the discrete cosine transform and the discrete wavelet transform, a dual-function digital watermarking method was proposed. By embedding robust watermark and fragile watermarking, the dual pur- pose of image copyright protection and image content authentication was achieved by this new method. The experimental results showed that this new algorithm, which used the wavelet trans- form features with robust watermark embedded in the tow-frequency image, had a good robust- ness. By using the discrete cosine transform with fragile watermark embedded in its high-frequen- cy part, this method also achieved the purpose of image authentication when attacked or tampered with more susceptible to damage fragile watermarking.
出处
《西安邮电学院学报》
2013年第1期50-53,共4页
Journal of Xi'an Institute of Posts and Telecommunications
