基于幅度调制的彩色图像水印

提出了一种基于幅度调制的彩色数字图像水印方案.通过改变蓝色通道的信息,实现了在空域嵌入水印.水印的嵌入位置通过一个密钥控制来实现随机的选取.为了提高鲁棒性,每一位水印被多次嵌入在不相关的多个位置中.同时,在有效水印的前面增加了一个模式序列,形成一个完整的水印序列,这个模式能够在水印提取过程中生成一个自适应的阈值,提高了水印提取的鲁棒性.水印提取不需要原始的宿主图像.试验结果显示该方案具有较强的抵御信号处理和几何攻击的鲁棒性.

Color Image Watermarking Based on Amplitude Modulation

This paper presents a color image watermarking scheme based on amplitude modulation. A binary sequence watermark is embedded into the spatial domain of the host image by changing the amplitude of the blue channels, and the embedding position are also selected randomly which is controlled by a secret key. In order to improve the robustness, each bit of the watermark is embedded into multiply positions which arc irrelevant to each other. A fixed binary sequence is added at the head of the payload watermark as a part of the embedded watermark sequence which can make an adaptive threshold in watermark extraction. The watermark extraction needs no original image. Experimental results show good performance at resisting common signal processing and geometrical attacks.