基于小波变换的数字图像水印

提出了一种基于嵌入式小波编码的水印算法,将标志图像的水印自适应地嵌入到小波分析图像的不同位平面层和不同分辨率区中,嵌入强度由被嵌系数所处的层和区决定.实验结果表明,算法生成的水印具有较好的抗攻击性和不可见性.该算法的实现过程容易同嵌入式小波编码相结合,实现编码过程中的水印嵌入.

Digital Image Watermarking Based on Discrete Wavelet Transform

A novel watermark casting scheme for digital images based on embedded wavelet coding is proposed. The watermark is embedded into the corresponding different resolution areas and different bit planes of the wavelet analysis images. The embedded capacity factor is determined by the area and bit plane where the selected wavelet coefficient is The detecting of watermarks is also hierarchical. Some experimental results demonstrate the better robustness and invisibility of watermarks embedded by our approach. At the same time, it is easier to combine the algorithm with embedded wavelet coding algorithm so as to implement the embedment. of the watermark in the process of image coding.