摘要
以静态图像为研究对象 ,提出了一种基于小波系数能量嵌入可视水印的算法 ,即首先对宿主信号进行小波变换 ,然后根据宿主信号在小波域的能量分布特征 ,把水印信息隐藏在能量最大的系数子块中 ;为提高水印信息的透明性 ,算法还同时引入了水印自适应系数。实验结果表明 ,该算法透明性较好 。
With still image being research subject, this paper presents a wavelet energy based watermarking algorithm that transforms the raw signal from spatial field to wavelet field and then embeds a visible watermark into its biggest block of coefficients by analyzing the distribution of the signal energy. On the other hand, the algorithm employs adaptive coefficient to improve watermark's imperceptibility. Simulations prove the algorithm imperceptible and robust to common signal processing and some vicious attacks.
关键词
数字水印
视觉系统
离散小波变换
digital watermark
human visual system
discrete wavelet transform
