基于视觉特性的自适应图像水印算法

An Adaptive Image Watermarking Algorithm Based on HVS

为了使数字水印具有较强的鲁棒性和不可见性,提出了一种基于人眼视觉特性和小波变换的图像水印嵌入方法.首先,通过混沌映射对二值水印进行置乱处理,然后,运用量化方法把水印自适应地嵌入小波变换系数中,且量化步长是根据图像局部相关特性和人眼视觉特性动态地进行调整.仿真实验表明,该算法不仅具有较好的透明性和安全性,而且对诸如叠加噪声、JPEG压缩、平滑滤波、几何剪切、图像增强等攻击均具有较好的鲁棒性.

In order to enhance the robustness and invisibility of digital watermarking, an algorithm of image watermark based on HVS and DWT was presented. First, the watermark was scrambled by Logistic map, and then the watermark was adaptively embedded into some of the wavelet transformation coefficients by quantizing technology, and the quantization steps could be dynamically adjusted according to the characteristics of HVS and local image. Experimental results showed that the proposed watermarking algorithm was invisible and secure, and robust against various signal processing such as noise adding, JPEG compression, filtering, cropping and image enhancement.