摘要
一种基于DWT的数字图像水印算法:先将1幅作为宿主图像的灰度图像进行分块,再利用Haar小波函数对分块分别进行二维离散小波变换,将水印信息嵌入到小波低频系数中,最后对嵌入水印信息的分块进行逆小波变换重构图像获得含水印图像。提取水印时不需要原始图像。通过Matlab进行仿真,实验结果表明该算法有很好的不可见性,并且对JPEG压缩、高斯噪声、高斯低通滤波等操作有较好的鲁棒性。
A blind watermarking algorithm for digital color image based on DWT is proposed, the steps are： dividing a gray image considered as the host image into sub-blocks, then performing 2D discrete wavelet transform on sub-blocks to embed water lines into low frequency coefficients of wavelet, finally, reconstructing the watermarking image by inverse wavelet transform. The watermark extract dispenses with original image. By MATLAB simulation experiment, the results demonstrate that the watermarks generated with the proposed algorithm are invisible and robust against JPEG compression, gaussian noise and gaussian low-pass filtering.
出处
《兵工自动化》
2009年第3期94-96,共3页
Ordnance Industry Automation
关键词
数字水印
小波变换
版权保护
Digital watermarking
Wavelet transform
Copyright protection
