面向网关版权保护的抗几何攻击视频水印方法

为了解决网关视频的版权保护问题，提出了一种网关视频水印快速嵌入和提取方法。该方法在视频帧内，首先以近线性时间检测和挑选仿射协变区域，然后采用基于最小生成树的区域选择算法消除重叠区域，最后以线性时间在离散小波变换域内嵌入水印；在视频帧间，利用视频场景的连续性基于场景边界仿射协变区域预测场景内部仿射协变区域以达到整体加速的目的。攻击实验表明：对测试序列嵌入水印后，针对几何攻击和格式变换压缩攻击，水印检测准确率分别达到93%和83%以上。仿真实验表明：在400在线主机局域网内，该方法能在10帧以内成功阻断网关水印视频的传输。

Fast geometric resistant video watermarking scheme for gateway copyright protection

To solve the problem of gateway copyright protection, a new fast approach was put forward for embedding and extracting gateway watermark in digital video. In intra frame watermarking, the method elegantly detected and selected affine covariant regions in nearly linear complexity. Then, the overlapped affine covariant regions were eliminated based on minimal spanning tree. Last, watermark bits were embedded in Discrete Wavelet Transform (DWT) coefficients in linear time. In inter frame watermarking, the method effectively utilized the continuity inside video scenes to predict the affine covariant regions in no-boundary frames based on boundary frame. The attacking experimental results show that under geometric attacks and format conversion attacks, the accuracies of watermark detection are above 93% and 83% respectively. The simulation results show that in local network with 400 online hosts, the proposed method can block gateway watermark video transmission within 10 frames.