具有人类视觉特性的可见水印算法

论文提出一种基于小波变换的可见水印算法,该算法利用人类视觉模型的亮度CSF和纹理敏感特性,根据主图像和水印图像的局部和全局特征,建立确定水印嵌入的拉伸系数数学模型。首先描述了人类视觉及小波分解系数分析,给出了小波系数视觉重要性权重值。把原图像和水印图像小波系数频率子带分成不同的块,基于视觉掩模对子块进行分类。利用人眼的纹理敏感特性,进一步增强了嵌入水印的图像视觉质量。仿真实验表明该算法结果良好。

Visible Watermarking Scheme With Human Visual System

A wavelet domain visible watermarking scheme has been proposed in which a mathematical model has developed by exploiting perceptual weighting masks derived from the luminance contrast sensitivity function and the texture sensitivity of human visual system(HVS) and using both host and watermark features.For this purpose,Contrast sensitive Function(CSF) of HVS and discrete wavelet transform are analyzed,Wavelet coefficients CSF weights are described.The original image and watermark image are divided into different blocks in the subband and these blocks are classified based on visual masking.The texture sensitivity of the human visual system(HVS) is taken into consideration so that the quality of the watermarked image is least degraded.Experiments indicate more excellent visual effect than other scheme.