A Novel H.264-based Multiple Description Video Coding Via Polyphase Transform and Partial Prediction

摘要

In this paper, a new H.264-based multiple description coding (MDC) scheme is proposed and called the prediction-based spatial polyphase transform (PSPT) MDC, to enhance the error resilience and reduce the computational complexity of the H.264 codec. In our approach, each input frame is first subsampled in both horizontal and vertical directions to form four subframes. Instead of directly coding and transporting all these subframes, two of them are predicted based on their neighboring subframes, followed by encoding and transmission. To handle the prediction process between the adjacent subframes, a hybrid interpolation algorithm is proposed, which combines the bilinear interpolation with some gradient tests. The simulation results demonstrate that the proposed MDC scheme is more robust and yields better reconstructed video qualities than existing approaches under an error-prone condition. Moreover, the computational complexity of the proposed encoder is reduced by half approximately, compared with that of the H.264/AVC