摘要
提出一种基于数字全息及失真校正的抗打印扫描数字图像水印方法,将水印以数字全息图的方式隐藏在载体图像离散傅里叶变换(discrete Fourier transform,DFT)幅度谱中,由载体图像纹理控制的峰值信噪比设定阈值,自适应调节水印嵌入强度.该方法利用了数字全息图的特点,采用基于DFT和边缘检测算法校正打印扫描图像的旋转失真,因而可从打印扫描图像中准确提取水印信号.相比以往同类水印算法,所提方法具有优良的不可见性和鲁棒性,以及较大的水印嵌入量.
This paper presents a novel print-scan resilient watermarking algorithm based on digital hologram and correction of distortion.A hologram of the watermark is obtained and embedded into the spectral mag-nitude of the host image.A PSNR threshold adapted to the texture of the host image is set to adjust the watermark strength.The rotation distortion due to the print-scan process is corrected based on discrete Fourier transform（DFT） and edge detection.The method makes use of the digital hologram characteristics,and is capable of extracting the embedded watermark from a print-scan version reliably.Compared with previous similar schemes,the proposed approach shows advantages in invisibility,robustness and embedding capacity.
出处
《应用科学学报》
EI
CAS
CSCD
北大核心
2011年第3期281-288,共8页
Journal of Applied Sciences
基金
上海市重点学科和科委重点实验室项目基金(No.S30108
No.08DZ2231100)资助
关键词
抗打印扫描
数字全息
失真校正
图像水印
print-scan resilient
digital hologram
correction of distortion
image watermarking
