一种基于位平面分解的多分辨率数字水印算法

提出了一种基于位平面分解的多分辨率图像数字水印方法;利用多分辨分解技术将相同分辨率层次的多分辨灰度数字水印嵌入到对应的相同分辨率层次的载体图像的小波系数中,使水印对原始图像具有自适应性。水印的嵌入位置由具有混沌特性的Arnold映射确定,在增加水印安全性的同时还解决了水印嵌入位置冲突的问题。由于在水印的嵌入过程采用了量化的方法,水印可实现盲提取。计算机仿真试验表明该算法具有良好的安全性、鲁棒性和可操作性。

An Image Digital Watermarking Algorithm Based on Bit-Plane-Decomposition and Multi-Resolution-Decomposition

Based on bit-decomposition technique and multiresolution-decomposition technique, a digital image watermarking algorithm is proposed in this paper. By multiresolution-decomposition technique, the decomposed watermarks of different resolution are embedded into the corresponding resolution of the decomposed original image, which makes the watermark be adapted to the original image. The chaotic Arnold map is utilized to generate the watermarking-embedding-position in order to enhance the security of watermarking. The watermarking can be extracted without the original image because the embedding procedure is based on the quantized method. Experimental results show that the proposed algorithm is robust to some image processing operations.