Flicker Forensics for Camcorder Piracy
Flicker Forensics for Camcorder Piracy
复制标题
摄像机盗版的闪烁取证
DOI：
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发表时间：
2017
影响因子：
6.8
通讯作者：
Min Wu
中科院分区：
文献类型：
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作者：
Adi Hajj;Séverine Baudry;B. Chupeau;G. Doërr;Min Wu
摄像机盗版是指使用摄像机录制显示受版权保护内容的屏幕的过程。与之前旨在检测摄像机盗版发生的工作不同，本文深入研究了由于液晶显示器（LCD）屏幕和摄像机之间的相互作用而自然存在于摄像视频中的亮度闪烁。我们首先模型的闪烁信号，并表明其参数是绑在这样的内部特性的海盗设备的背光频率的LCD屏幕和读出时间的摄像机。然后，我们提出了新的估计技术来恢复这些隐藏的参数直接从摄录视频和证明，这样的法医线索可以提供情报的海盗设备。我们还讨论了如何恢复低功耗闪烁信号本身的形状，并表明它可以用来推断在盗版LCD屏幕中采用的背光技术。
Camcorder piracy refers to the process of using a camcorder to record a screen that displays copyrighted content. In contrast to the previous works that aimed at detecting the occurrence of camcorder piracy, this paper conducts an in-depth study of the luminance flicker that is naturally present in camcorded videos due to the interplay between a liquid-crystal-display (LCD) screen and a camcorder. We first model the flicker signal and show that its parameters are tied to such internal characteristics of the pirate devices as the back-light frequency of the LCD screen and the read-out time of the camcorder. We then present new estimation techniques to recover these hidden parameters directly from camcorded videos and demonstrate that such forensic cues could provide intelligence on the pirate devices. We also discuss how to recover the shape of the low-power flicker signal itself and show that it could be used to infer which back-light technology employed in the pirate LCD screen.
利用电源签名进行相机取证
影响因子：
3.9
作者：
Hajj-Ahmad, Adi;Berkovich, Andrew;Wu, Min
通讯作者：
Wu, Min