An Adaptive Watermarking Algorithm for DEM Based on DFT
一种基于DFT的DEM自适应数字水印算法

This paper introduces an adaptive watermarking algorithm for DEM. This proposed method can utilize human visual system(HVS), features of DEM data and discrete Fourier transform(DFT) to determine adaptively the location where the watermark can be hidden. And then, the watermark information is added to the lowness frequency of the texture region DFT. Experimental results show that the novel watermarking scheme for DEM has good imperceptibility, little effect on DEM accuracy and is robust to noise attack.