基于人类视觉系统的小波域的数字水印算法

本文首先分析了前人的小波域数字水印算法,然后应用人眼视觉特性和离散余弦变换变换对算法进行了改进。重点论述了水印的嵌入和提取,并选取了一幅有实际意义的二值图象作为水印,通过修改中、低频系数来进行水印的嵌入。实验证明嵌入水印后的图象有更好的隐蔽性,并且对JPEG压缩、图象添加噪音、中值滤波、剪切等图象处理操作具有很强的稳定性。

Algorithm of Digital Watermark in Wavelet Domain Based on Human Visual Systerm

This paper analyzes a digital watermark in wavelet domain and improves it with HVS and DCT. The watermark is a meaningful binary image.It selects the wavelet coefficients based on HVS and DCT,and then the coefficients is modified to embed the watermark. It is improved that the processed image has better transparency,robustness to JPEG compression,additive noise,filter and crop etc