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Spatial Synchronization Using Watermark Key Structure

机译:使用水印密钥结构的空间同步

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摘要

Recently, we proposed a method for constructing a template for efficient temporal synchronization in video watermarking. Our temporal synchronization method uses a state machine key generator for producing the watermark embedded in successive frames of video. A feature extractor allows the watermark key schedule to be content dependent, increasing the difficulty of copy and ownership attacks. It was shown that efficient synchronization can be achieved by adding temporal redundancy into the key schedule. In this paper, we explore and extend the concepts of our temporal synchronization method to spatial synchronization. The key generator is used to construct the embedded watermark of non-overlapping blocks of the video, creating a tiled structure. The autocorrelation of the tiled watermark contains local maxima or peaks with a grid-like structure, where the distance between the peaks indicates the scale of the watermark and the orientation of the peaks indicate the watermark rotation. Experimental results are obtained using digital image watermarks. Scaling and rotation attacks are investigated.
机译:最近,我们提出了一种用于构建模板的方法,该模板用于视频水印中的有效时间同步。我们的时间同步方法使用状态机密钥生成器来生成嵌入在连续视频帧中的水印。特征提取器允许水印密钥计划依赖于内容,从而增加了复制和所有权攻击的难度。结果表明,可以通过在密钥计划中添加时间冗余来实现有效的同步。在本文中,我们探索并将时间同步方法的概念扩展到空间同步。密钥生成器用于构造视频的非重叠块的嵌入水印,从而创建平铺结构。平铺水印的自相关包含具有网格状结构的局部最大值或峰,其中峰之间的距离表示水印的比例,而峰的方向表示水印旋转。使用数字图像水印获得了实验结果。研究了缩放和旋转攻击。

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