【摘要】 在对现有空域算法研究的基础上,提出了一种基于置乱和哈达玛变换的空域图像水印算法。本算法以移位寄存器产生的伪随机二进制序列作为水印,并通过扩充产生冗余;同时使用哈达玛变换将水印能量进行聚集;并基于随机置乱方法在空域选择水印的加入位置。实验表明该方法具有较好的效果。更多还原

【Abstract】 A new spatial digital image watermark imbedding algorithm is presented after analyzing the merit anddeficiency of all spatial domain watermarking algorithms. In the algorithm,it is using pseudorandom binary se-quence which generated by shift register as a watermark;generating redundancy by spreading;then gathering wa-termark energy by Hadma transform and selecting the imbedding position in spatial domain based on toral auto-morphism method; a dopting double secret key of watermarking encrypt and toral automorphism position. Testsshow that it is very effective.更多还原