22 March 2013 A sneak peek into the camcorder path
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A number of technologies claim to be robust against content re-acquisition with a camera recorder e.g. water- marking and content ngerprinting. However, the benchmarking campaigns required to evaluate the impact of the camcorder path are tedious and such evaluation is routinely overlooked in practice. Due to the interaction between numerous devices, camcording displayed content modi es the video essence in various ways, including geometric distortions, temporal transforms, non-uniform and varying luminance transformations, saturation, color alteration, etc. It is necessary to clearly understand the di erent phenomena at stake in order to design ef- cient countermeasures or to build accurate simulators which mimic these e ects. As a rst step in this direction, we focus in this study solely on luminance transforms. In particular, we investigate three di erent alterations, namely: (i) the spatial non uniformity, (ii) the steady state luminance response, and (iii) the transient luminance response.
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Cherif Ben Zid, Cherif Ben Zid, Séverine Baudry, Séverine Baudry, Bertrand Chupeau, Bertrand Chupeau, Gwenaël Doërr, Gwenaël Doërr, } "A sneak peek into the camcorder path", Proc. SPIE 8665, Media Watermarking, Security, and Forensics 2013, 86650E (22 March 2013); doi: 10.1117/12.2006103; https://doi.org/10.1117/12.2006103

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