【摘要】 根据图像DCT交流系数的统计特性,基于直流和交流信号的合成和分离方法,探索了一条频率域鲁棒水印的新思路。在载体DCT中频域中建立近似直流信号,把灰度水印图像置乱并调制成交流信号,水印的嵌入和检测过程转化为直流和交流信号的合成和分离过程。仿真分析表明,提出的算法具有嵌入水印信息量大、鲁棒性强和实现水印盲检测等优点。更多还原

【Abstract】 A novel digital watermarking scheme for gray-scale image embedding and extracting is proposed, which is based on synthesis and separation method of direct and alternating signal. Direct signal was founded in host image in DCT domain, and the modulated watermark is regarded as alternating signal, so watermark embedding and extracting are similar with direct and alternating signal synthesizing and separating. The only thing needed during extracting is the key. Experimental results show that embedded watermark has a certain capacity and robustness.更多还原