Based On The Error Resilience Of H.264 Video Coding Standard Encoder Dsp

As the rapid development in communication and network techniques, the network based video services have become a necessity in human life. Since the packet loss in a wireless network and the Internet is inevitable, a robust and efficient video coding scheme is required. After a detailed study on the error resilience and error concealment, a novel H.264 based multiple description video coding scheme via special polyphase transform is proposed in this paper. The video coding scheme is implemented in a TI TMS320C6416 DSP platform, and the algorithm is optimized according to the structural and storage features of the DSP. Experimental results have proven the coding efficiency and error tolerant capacity.A typical spatial polyphase transform multiple description coding scheme sub-samples the input image in both horizontal and vertical directions, forming four subframes, which are coded and transported by the separate encoders, respectively, to construct four descriptions. Because of the high space correlation among four descriptions, the coding method is very robust but unpractical. In this paper, a new multiple description video coding algorithm, called Prediction-Based Spatial Polyphase Transform(PSPT)Multiple Description Video Coding, is proposed to promote the error resilient ability and reduce the computational complexity of the H.264 coder. Instead of directly coding and transmitting all four sub-frames, only two sub-frames are encoded by separate H.264 encoders and transmitted; while the others are first predicted by the former two (actually, each pixel is predicted by its four neighbors in the original image), and only predicted errors are encoded and transmitted. Compare with the original H.264 encoder, the proposed encoder costs only 50%~60% of the computational time. The simulation results demonstrate the good performance of the proposed coder. Under error-prone conditions, the proposed scheme exhibits much better error resilient capacity and video qualities than the existing approaches.To meet the practical application requirement, the design and implementation of...