基于幅度调制和视觉掩蔽特性的彩色图像水印

Color digital watermarking based on amplitude modulation and visual masking

提出了一种基于幅度调制的盲检测彩色图像水印算法,为了改善可见性,根据人眼视觉特性(HVS)自适应选择其嵌入位置。水印嵌入是通过修改图像中像素蓝色通道信息来实现的,而水印提取是基于对嵌入水印位置的邻域像素值的线性组合的预测而完成的。在嵌入过程中通过高斯模板来均衡调整嵌入水印后对宿主图像影响的强度。仿真实验证明该文算法不仅具有非常好的透明性,而且对诸如叠加噪声、JPEG压缩、平滑滤波、几何变换、图像增强等攻击具有很好的鲁棒性。

This paper presents a color image watermarking method with blind detection based on amplitude modulation.On the basis of the visual masking of human visual system,the embedded position is chosen adaptively.Basically,the watermark is embedded by modifying the pixel values in the blue channel of an image,while the watermark retrieval is achieved by using a prediction technique based on linear combination of nearby pixel values around the embedded pixels.We use a technique of Gaussian weighting marks by averaging the luminance of its own pixel and its neighboring pixels,and use it as an additional scaling factor to tune the strength of embedding watermark.Experimental results show that the presented scheme is invisible and robust against various signal processing such as cropping,compression,filtering,noise adding,image enhancement and geometrical attacks.