利用小波变换的视频GIS数据数字水印算法

Watermarking Algorithm Using Wavelet Transform for GIS Video Data

提出了一种基于小波变换的视频GIS数据水印算法。该算法结合视频GIS数据特点,将视频流分割为时间轴上连续图像序列。实验结果表明,该算法具有较好的隐蔽性与鲁棒性,并能有效抵抗帧删除、重编码等攻击。

A new digital watermarking algorithm using wavelet transformation for video GIS data was proposed.In the watermark embedding scheme,firstly,the original watermark was changed into a binary image matrix and scrambled.Secondly,the points selected form the video frame feature could be formed into a two-dimensional matrix and taken the wavelet transformation.The low-frequency coefficients were selected to embed the watermark using the quantify method.Finally,the inverse wavelet transformation was taken to replace the original feature points.In the watermark detecting scheme,the optimal watermark information was detected using by the fusion of the watermarks which had been detected from the continuous sequence of images on the timeline and the model.Experimental results show that the algorithm has good invisibility and robustness,and could effectively resist the remove of the frame,re-encoding.