摘要
提出一种数字图像水印技术方案,先对数字图像进行小波变换,以低频系数作为初始控制顶点建立B样条曲线,通过B样条曲线的形变来反算一组新的控制顶点,新的控制顶点与原始控制顶点之间的差异就意味着水印的嵌入·由于B样条曲线的平滑性及易于插值与重采样等特点,故该水印方案对滤波、缩放等攻击具有强抵抗力·实验结果也证明该方案具有这些优点·文中还分析了在特定边界条件下反算控制顶点的算法,以及在水印强度不超过人眼视觉系统对噪声的敏感尺度时B样条的形变程度·
A novel model-based digital watermarking scheme is proposed in this paper. By the scheme, a discrete wavelet transformation is made to an image, and a group of uniform B-spline curves are defined with the lowest resolution wavelet coefficients as control points, then the bits of watermark signal are embedded into the B-spline curves by disturbing some points of the curves. The strength of watermark is controlled according to the characteristics of human visual system. Supported by experiments, the performance analysis of the proposed scheme is also made in this paper. Experimental results show that this scheme is especially strong in withstanding the attacks of filtering, resizing, sharpening, denoising and JPEG compression.
出处
《计算机辅助设计与图形学学报》
EI
CSCD
北大核心
2005年第7期1463-1469,共7页
Journal of Computer-Aided Design & Computer Graphics
基金
国家自然科学基金(60275023)
福建省自然科学基金(A0210016
A0510012)
福建省教育厅基金(JA03028)
关键词
B样条曲线
数字水印
小波
控制顶点
B-spline curve
digital watermarking
wavelet
control point
