摘要
针对半色调(二值)图像提出一种新的数字水印算法。利用人眼的视觉掩盖特性和亮度适应特性,将水印隐藏在半色调图的高亮度纹理区域;采用加密和置乱技术提高二值水印图像的安全性,定义位卷积并设计r-位滤波器来指导水印的嵌入和提取。仿真结果表明:在嵌入相同数据量时,该算法较常规方法有更好的水印不可见性,当图像遭受裁剪、加噪、JPEG压缩、随机涂改攻击时,仍能正确提取其中嵌入的水印。
A digital watermarking algorithm for halftone (binary) images was proposed. Using visual masking and luminance adaptation characteristics in human eyes, the watermark was embedded in high-light textured areas, and watermark security was improved with encrypt and scrambling techniques. Bit convolution was defined and an r-bit filter was constructed in order to help watermark embedding and extraction. Experiments show that the proposed method has a better watermark imperceptibility compared to traditional halftone watermarking algorithms. Furthermore, when watermarked halftone is attacked by cropping, noise, JPEG compression, or random marking, watermarking can still be correctly extracted.
出处
《吉林大学学报(工学版)》
EI
CAS
CSCD
北大核心
2006年第5期782-786,共5页
Journal of Jilin University:Engineering and Technology Edition
基金
国防科技预研基金资助项目(51416050205)
西安电子科技大学研究生创新基金资助项目(05008)