一种基于彩色图像的双重水印算法

针对传统水印算法功能单一,抗几何攻击能力较弱的问题,提出了一种基于离散小波变换(DWT)、奇异值分解(SVD)、离散余弦变换(DCT)和HSV空间模型的彩色图像双重水印算法.该算法基本思想是在彩色载体图像中先后嵌入可见水印和不可见水印.根据HSV 空间模型和DCT变换实现二值可见水印自适应嵌入,用来标识版权;通过DWT和SVD变换实现不可见彩色水印的嵌入,用于加强版权保护,利用Zernike矩进行旋转校正.实验结果表明,该算法在保证图像质量的前提下,可见水印具有较好的视觉可见性,不可见水印的抗几何攻击能力得到了提升.双重水印相互作用,功能互补提高了水印的版权保护功能.

A dual watermarking algorithm based on color image

In view of single function and the weak capability of anti -geometric -attacking of the traditional watermarking algo-rithm,this paper proposes a color image with double watermarking algorithm which based on discrete wavelet transform(DWT), singular value decomposition(SVD),discrete cosine transform(DCT)and HSV space model.The basic idea is to embed visible and invisible watermarking successively.This algorithm embeds the binary visible watermarking to identify copyright according to the HSV space model and DCT transform;embeds the invisible color watermarking to strengthen copyright protection by DWT and SVD transform and applies Zernike moments for rotation correction.Experimental results show that under the premise of guarantee-ing the quality of the image,visible watermarking has better visual visibility,and the ability of anti-geometric-attacking of invisi-ble watermarking has been improved.The interaction and complementary function of double watermark improves the copyright pro-tection.