A ROI encryption scheme for H.264 video based on moving object detection

To protect the privacy in the surveillance video, a selective encryption scheme for region of interest (ROI) of H.264 video is proposed in this paper. By only encrypting the content of ROIs, the most important part of video can be protected with less cost and operation. The technique of moving object detection is employed to locate the ROIs in the video automatically. There is no need to transmit additional position information of ROIs to the end of decryption. ROI is encrypted with other area unchanged under the mechanism of Flexible Macroblock Ordering (FMO). A new encryption algorithm is designed to modify both luminance component and chrominance components to achieve good encryption quality and location accuracy. In decryption, the encrypted area is located automatically, and the encrypted video is decrypted with the secret key. JM 18.4 software is employed to perform the simulation experiment. Experimental results present the accuracy and effectiveness of our scheme to encrypt and decrypt the ROIs in H.264 video.