ROI Encryption for the HEVC Coded Video Contents

International audienceIn this paper we investigate privacy protection for the HEVCstandard based on the tile concept. Tiles in HEVC enable tosplit the video into independent rectangular regions. Two solutionsare proposed to encrypt the tiles containing the RegionOf Interest (ROI). The first solution performs encryption atthe bitstream level by encrypting all HEVC syntax elementswithin the ROI tiles. The second solution enables a selectiveencryption of the ROI tiles under constant bitrate and formatcompliant requirements. To avoid temporal propagationof the encryption outside the ROI boundaries, caused by interprediction, the Motion Vectors of no ROI regions are restrictedinside the no encrypted tiles in the reference frames.Simulation results show that the proposed solutions performsecured and adaptive encryption of ROI in the HEVC video.Moreover, the bitrate overhead caused by the MVs restrictionwindow varies between 1%-2:5% depending on both thevideo content and the number of tiles within the frame