摘要
提出了一种用于图像认证的自适应半易损数字水印系统.水印方案采用基于小波变换的空间 频域分析方法,定义了一个小波系数量化函数实现水印的嵌入和提取.设计了3个混沌密钥,用来定义水印及其嵌入位置.水印的量化参数可以根据防篡改的灵敏度要求来设置.本文的水印方案不仅能够给出篡改的严重程度,而且还可以给出篡改的位置,并能很好地容忍JPEG压缩.
A quantization function is defined to quantify the wavelet coefficients according to watermarks to be embedded. Three chaos keys are designed to define watermarks to be embedded and determine the position for watermark embedding. The sensibility for tampering detection can be acquired by adjusting the quantization coefficients. The proposed scheme can indicate the position tampered as well as tell how serious the image was tampered. In addition, the scheme tolerates JPEG to a large extent.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
2003年第3期321-325,共5页
Journal of Harbin Engineering University
关键词
数字水印
小波变换
图像认证
半易损数字水印
digital watermarking
wavelet transform
image authentication
semi-fragile watermarking
