【摘要】 针对彩色载体图像,本文提出了一种超复数频域的自适应水印算法,它首先对彩色载体图像进行快速超复数傅氏变换,在超复数频谱实部选择合适频段的基础上,再利用人类视觉系统对彩色载体图像的纹理、边缘和亮度的掩蔽特性,对选择的频段赋予不同的掩蔽强度而嵌入水印,从而在超复数频域内实现了一种彩色载体图像自适应的水印算法.实验结果表明,通过彩色图像的自适应掩蔽,大大提高了超复数频域水印算法的不易感知性和鲁棒性,且抗攻击性能也优于无自适应掩蔽的超复数频域水印算法;和现有文献的比较结果验证了本算法的这些优越性.更多还原

【Abstract】 For color host images,a novel adaptive watermarking algorithm based on hypercomplex Fourier transform is proposed in this paper.Firstly the color host image is transferred into hypercomplex frequency domain.Then some real parts of the hypercomplex frequency spectra of the color host image are selected.Based on the different mask properties of the human vision system about the texture,edge and luminance of the color host image,the selected frequency spectra are put the different mask weights for the embedded watermark.As a result,an adaptive watermarking algorithm for color host images in hypercomplex spectrum domain is realized.Experimental results show that the robustness and insensitiveness of our method are much improved by the adaptive masks of the color image.Its anti-attacking capability is also much better than the hypercomplex watermarking algorithm without adaptive masks.Comparison results with the known ones in literature verify such superiorities of the proposed algorithm.更多还原