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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 41619 (19)
- University: Sharif University of Technology
- Department: Computer Engineering
- Advisor(s): Kasaei, Shohre
- Abstract:
- Due to fast growth of wireless mobile networks, video transmission over wireless media has been widely studied. As wireless networks are error prone, there is a high possibility of loss in sent packets. Since time limitations in real-time video applications should be met, the delay- related to resending packets -is not acceptable and the error should to be concealed at receiver side. In this thesis, with respect to different concealment methods, two new methods for temporal error concealment are proposed. In the first method, an optimized set of motion vectors is formed using motion vectors in surrounding blocks of the lost macro block, and then this set is searched for the best motion vector. For extending the candidate vector set, two best vectors -chosen by a distortion measure- are combined. The second method utilizes the first method but a pre-process is required for determining a better set of motion vectors to be searched. The preprocess consists of searching the motion vectors of neighbouring blocks to determine the range of search space. The proposed methods are implemented in the H.264 reference software (JM 17.2) and final results are compared by PSNR, SSIM and MSE distortion measures
- Keywords:
- Error Conceament ; H.264 Video Codec ; Real Time Application ; Video Reconstruction at Decoder Side ; JM Software
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