摘要
提出一种以数字全息和小波变换为基础的数字水印技术,实现在原始图像中嵌入数字全息水印。首先通过傅里叶变换方法将待隐藏的图像制成数字全息水印图,接着将数字全息水印图和原始图像都分为四个子块,并对原始图像子块进行小波分解,最后将数字全息图像子块嵌入到原始图像相应子块较大的小波系数中。实验仿真结果证明了该水印技术对图像剪切和图像有损压缩有较好的稳定性。
A new digital watermark technique based on digital holography and discrete wavelet transform is presented.The digital holographic watermark is embedded into an original image.Firstly,the secret image is transformed into a digital hologram image by the means of Fourier transform.Then the original image and digital holographic watermark are divided into four sub-images.The original sub-images are transformed by wavelet analysis.Lastly the digital hologram sub-images are embedded into the large wavelet coefficients.The experimental results indicate that the proposed method is robust to image lossy compression and image cropping.
出处
《光学技术》
CAS
CSCD
北大核心
2009年第5期678-681,共4页
Optical Technique
基金
省教育厅科技项目(JA08214)
省重点学科资助项目(XK0702)
关键词
数字全息
数字水印
小波变换
傅里叶变换
digital holographic
digital watermark
wavelet transform
fourier transform
