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9 February 2012 Forensic characterization of camcorded movies: digital cinema vs. celluloid film prints
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Digital camcording in the premises of cinema theaters is the main source of pirate copies of newly released movies. To trace such recordings, watermarking systems are exploited in order for each projection to be unique and thus identifiable. The forensic analysis to recover these marks is different for digital and legacy cinemas. To avoid running both detectors, a reliable oracle discriminating between cams originating from analog or digital projections is required. This article details a classification framework relying on three complementary features : the spatial uniformity of the screen illumination, the vertical (in)stability of the projected image, and the luminance artifacts due to the interplay between the display and acquisition devices. The system has been tuned with cams captured in a controlled environment and benchmarked against a medium-sized dataset (61 samples) composed of real-life pirate cams. Reported experimental results demonstrate that such a framework yields over 80% classification accuracy.
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Xavier Rolland-Nevière, Bertrand Chupeau, Gwenaël Doërr, and Laurent Blondé "Forensic characterization of camcorded movies: digital cinema vs. celluloid film prints", Proc. SPIE 8303, Media Watermarking, Security, and Forensics 2012, 83030R (9 February 2012);

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