基于空间视觉掩蔽效应的图像数字水印频域技术

首先分析了人眼视觉系统的特性，提出了一种利用人眼视觉掩蔽效应，以获得较好鲁棒性和不为人眼所感知的数字水印方法。实验结果表明，这一方法具有较好的特性。最后结合实验给出了对彩色图像进行数字水印处理的方法。

Watermarking for Image Based on Visual Masking

Digital watermarking has been proposed as viable solution to the need of copyright protection and other application such as information hiding,since it makes possible to identify the author,owner,distributor or authorized consumer of a document.A new technique to embed the mark signal into the image is introduced.The method operates in the frequency domain to modify the DCT coefficients of an image and then uses the characteristic of Human Visual System (HVS) to enhance the robustness of the watermark and avoid the perceptibility of human eyes.Experimental results demonstrate that the watermark is robust to most of the signal processing techniques and geometric distortions.