Detection of video double encoding with GOP size estimation
Detection of video double encoding with GOP size estimation
复制标题
DOI：
10.1109/wifs.2012.6412641
复制
发表时间：
2012-12
期刊：
影响因子：
--
通讯作者：
David Vázquez-Padín;M. Fontani;T. Bianchi;Pedro Comesaña Alfaro;A. Piva;M. Barni
中科院分区：
文献类型：
--
作者：
David Vázquez-Padín;M. Fontani;T. Bianchi;Pedro Comesaña Alfaro;A. Piva;M. Barni
视频取证是一门新兴的学科，旨在以盲态的方式推断数字视频所经历的处理历史信息。在这项工作中，我们引入了一个新的法医足迹，并在此基础上，提出了一种方法，用于检测视频是否已被编码两次，如果是这种情况下，我们还估计在第一次编码的图片组（GOP）的大小。如实验中所示，足迹被证明即使在现实环境中也是非常鲁棒的（即，当使用典型的压缩率进行编码时），现有技术很少解决这些问题。
Video forensics is an emerging discipline, that aims at inferring information about the processing history undergone by a digital video in a blind fashion. In this work we introduce a new forensic footprint and, based on it, propose a method for detecting whether a video has been encoded twice; if this is the case, we also estimate the size of the Group Of Pictures (GOP) employed during the first encoding. As shown in the experiments, the footprint proves to be very robust even in realistic settings (i.e., when encoding is carried out using typical compression rates), that are rarely addressed by existing techniques.