摘要
利用人类的视觉特性,文章提出一种基于离散小波变换数字水印技术。首先以随机产生的二值序列作为水印,然后将原图像做若干层小波分解,通过视觉模型计算出各小波系数相应的门限值,自适应地调整水印的嵌入强度。实验结果表明,数字水印技术对一些图像处理操作和JPEG有损压缩具有较好的鲁棒性。
A digital watermarking technique based on discrete wavelet tranform(DWT) is presented in consideration of human visual properties. First, a binary random sequence is generated as the watermark. Then the N-layer discrete wavelet decomposition of the original image is performed to transform the image into wavelet domain. The corresponding threshold value of each wavelet coefficient is obtained utilizing a visual model, thus the watermark insertion strength can be tuned adaptively. Experimental results show that the proposed technique is robust enough to some image processing operations and JPEG lossy compression.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
2004年第8期874-877,共4页
Journal of Hefei University of Technology：Natural Science
基金
国家自然科学基金资助项目(10171026)
安徽省自然科学基金资助项目(03046102)
关键词
数字水印
视觉模型
离散小波变换
digital watermark
visual model
discrete wavelet transform
