基于整数小波变换的栅格数字地图数字水印算法

Watermarking Algorithm for Digital Grid Map Based on Integer Wavelet Transformation

根据栅格数字地图亮度高、低频分量变化大、像素值为整数等特点,提出了一种基于整数小波变换的栅格数字地图水印算法。首先将栅格数字地图进行离散整数小波变换,然后分别将水印嵌入到低频分量和高频细节分量。低频分量部分依据其亮度自适应嵌入周期性扩展水印,细节分量部分根据人类视觉系统特性在感知重要系数中嵌入水印信息。实验表明,该算法对于诸如JPEG压缩、剪裁、锐化、扭曲变形等各种常见的恶意攻击具有良好的鲁棒性。

We proposed a new watermarking algorithm for the digital grid map based on integer wavelets transformation. The digital grid map was decomposed by integer wavelets transformation firstly. Then the watermark was embedded into low frequency section and high frequency section respectively. The watermark was adaptively embedded into low frequency section according to the luminance, and embedded into part of high frequency section as well. Which is selected by the characteristics of human visual systems and the intrinsic relations of wavelet coefficients. The experiments show that the proposed algorithm is robust against various vicious attacks such as JPEG compression, sharpening, cutting.