基于超复数傅里叶变换的彩色图像水印算法

提出了一种基于四元数傅里叶变换(QFFT)和改进的量化索引调制(QIM)算法的彩色图像数字水印嵌入算法,对载体图像进行QFFT变换,对水印图像进行压缩及量化编码,从而嵌入到经过QFFT变换的载体图像的分量中,实现了水印的嵌入以及盲提取. 实验结果表明,基于带失真补偿的QIM算法的水印算法对比传统QIM,实现了不可见性和鲁棒性的较好折衷,对高斯、椒盐噪声、JPEG压缩、遮挡、滤波以及图像增强攻击有更好的鲁棒性. 

A Watermarking Algorithm of Color Images Based on Quaternion Fourier Transform

A watermarking algorithm of color images based on the quaternion Fourier transform(QFFT) and improved quantization index modulation algorithm(QIM) was proposed in this paper. The original image was transformed by quaternion Fourier transform, the watermarking image was processed by compression and quantization coding, and the processed watermarking image was embedded into the components of the transformed original image. It achieves watermarking embedding and blind extraction. The experimental results show that the watermarking algorithm based on distortion compensated QIM algorithm achieves a good trade off between invisibility and robustness, and better robustness for the attacks of Gaussian noises, salt and pepper noises, JPEG compression, cropping, filtering and sharpening than the traditional QIM algorithm.