作 者: ;
机构地区: 泉州师范学院物理与信息工程学院物理系
出 处: 《光学技术》 2009年第5期678-681,共4页
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.
领 域: [电子电信] [自动化与计算机技术] [自动化与计算机技术]