Smart selective encryption of H.264/AVC videos using confidentiality metrics |
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Authors: | L?Dubois Email author" target="_blank">W?PuechEmail author J?Blanc-Talon |
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Affiliation: | 1.LIRMM Laboratory, UMR 5506 CNRS,University of Montpellier II,Montpellier Cedex 05,France;2.DGA,Bagneux Cedex,France |
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Abstract: | In the field of video protection, selective encryption (SE) is a scheme which ensures the visual security of a video by encrypting only a small part of the data. This paper presents a new SE algorithm for H.264/AVC videos in context-adaptive variable-length coding mode. This algorithm controls the amount of encrypted alternative coefficients (ACs) of the integer transform in the entropic encoder. Two visual quality measures, the peak signal-to-noise ratio (PSNR) and the structural similarity (SSIM), are used to measure the visual confidentiality level of each video frame and to control the amount of encrypted ACs. Moreover, a new psychovisual metric to measure the flickering is introduced, the so-called temporal structural similarity (TSSIM). This method can be applied on intra and inter frame video sequences. Several experimental results show the efficiency of the proposed method. |
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