New gray-scale watermarking algorithm of color images based on Quaternion Fourier Transform

Wei-jiang Wang, W. Zuo, Xue-mei Yan
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引用次数: 8

Abstract

A scheme of embedding gray-scale watermark image into an RGB carrier image based on the fast Quaternion Fourier Transform (QFT) is proposed. In this algorithm, the R, G, B color components are represented respectively by the three imaginary parts of a pure imaginary quaternion. Then the gray-scale watermark image is inserted into the real part of the carrier image which is transformed by the 2D-QFT. According to the special symmetrical characteristic of the real part, the insertion of the gray-scale watermark image without lose is realized. Experiments show that the watermark inserted in the scheme has the biggest imperceptibility with the best PSNR when compared with other gray-scale watermarking schemes.
基于四元数傅立叶变换的彩色图像灰度水印新算法
提出了一种基于快速四元数傅立叶变换(QFT)的灰度水印图像嵌入RGB载波图像的方法。在该算法中,颜色分量R、G、B分别用纯虚四元数的三个虚部表示。然后将灰度水印图像插入到经2D-QFT变换的载体图像的实数部分。利用实数部分特殊的对称特性,实现了灰度水印图像的无损插入。实验表明,与其他灰度水印方案相比,该方案所嵌入的水印具有最大的不可感知性和最佳的PSNR。
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