基于冗余字典的一种新的数字图像水印算法

基于图像的超完备字典稀疏表示是一种新的图像表示理论,利用字典的冗余性可以有效地得到图像的几何结构特征,从而实现图像的表示.当前稀疏表示的理论研究主要集中在稀疏分解算法和字典构造算法两方面.基于此稀疏特性,本文提出了一种新的基于冗余字典的数字水印方法.此方法利用图像在超完备字典上的自适应稀疏分解,通过在字典域实现数字水印算法.实验结果证实了本文所提方法的有效性.

A New Watermarking Algorithm Based on Sparse and Redundant Representations

The sparse representation based on over-complete dictionary is a new image repre- sentation theory. The geometrical characteristics of the images can be effectively obtained by the use of the redundancy of dictionary. Recent activities in this field concentrate mainly on the study of sparse decomposition algorithm and dictionary design algorithm. Based on spare characteristics, this paper proposes a novel digital watermarking method based on the sparse representation, which can be perfectly applied to digital watermarking. By the application of the over-complete dictionary＇s self-adaptable sparse decomposition of images, the digital watermarking algorithm is achieved through the dictionary domain. Experimental result demonstrates that the proposed method in this paper is feasible and effective.