基于分块图像小波变换的数字水印算法研究

Research on Digital Watermarking Algorithm Based on Block Wavelet Transform

提出一种基于分块图像小波变换的数字水印嵌入和提取算法,使每一个水印像素隐藏在相应的图像块的中低频小波系数之中,保证了水印的稳健性和不可觉察性,实验表明水印具有抗一般信号处理(例如图像压缩、剪切等)能力。

Proposes an algorithm of digital watermark based on block wavelet transform. Each pixel of a watermark is embedded in the wavelet coefficient of the middle and low frequency of a block in the images. Experiments show, the digital watermark is robust enough to image degradation.