摘要
离散余弦变换(discretecosinetransform,DCT)和奇异值分解(singularvaluedecomposition,SVD)都可以作为数字水印算法有效的工具,现提出了一种基于离散余弦变换和奇异值分解联合的数字水印算法,先对整幅图像运用离散余弦变换,将离散余弦系数按照“之”字型顺序绘制成4个象限,然后再对每个象限运用奇异值分解方法。实验结果表明本算法具有很好的稳健性,在经过了一般的信号处理操作和JPEG压缩后,嵌入的水印能被可靠的提取和检测。
Discrete cosine transform （ DCT ） and singular value decomposition （SVD） have been used as tools for embedding data into an image. A hybrid watermarking algorithm based on DCT and SVD is proposed, after applying the DCT to the whole image and mapping the DCT coefficients in a zig-zag order into four quadrants, and then applying the SVD to each quadrant. Experimental results show that the watermarking algorithm performs well in robustness, the embedded watermark is detected reliably, following usual signal processing and JPEG compression.
出处
《计算机工程与设计》
CSCD
北大核心
2007年第1期109-111,共3页
Computer Engineering and Design
基金
江苏省自然科学基金项目(bk2003017)
关键词
稳健的
版权保护
数字水印
离散余弦变换
奇异值分解
robust
copyright protection
digital watermarking
discrete cosine transform
singular value decomposition
