tailieunhanh - Báo cáo hóa học: " Joint redundant motion vector and intra macroblock refreshment for video transmission"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Joint redundant motion vector and intra macroblock refreshment for video transmission | Xiao et al. EURASIP Journal on Image and Video Processing 2011 2011 12 http content 2011 1 12 D EURASIP Journal on Image and Video Processing a SpringerOpen Journal RESEARCH Open Access Joint redundant motion vector and intra macroblock refreshment for video transmission Jimin Xiao1 2 Tammam Tillo 2 Chunyu Lin3 and Yao Zhao3 Abstract This paper proposes a scheme for error-resilient transmission of videos which jointly uses intra macroblock refreshment and redundant motion vector. The selection of using intra refreshment or redundant motion vector is determined by the rate-distortion optimization procedure. The end-to-end distortion is used for the rate-distortion optimization which can be easily calculated with the recursive optimal per-pixel estimate ROPE method. Simulation results show that the proposed method outperforms both the intra refreshment approach and redundant motion vector approach significantly when the two approaches are deployed separately. Specifically for the Foreman sequence the average PSNR of the proposed approach can be dB higher than that of the intra refreshment approach and 5 dB higher than that of the redundant motion vector approach. Keywords AVC error resilience end-to-end distortion intra refreshment redundant motion vector 1. Introduction The AVC 1 video coding standard provides higher coding efficiency and stronger network adaptation capability in comparison to all the previously developed video coding standards. However as previous video compression standards it is still based on a hybrid coding method which use transform coding with motion-compensated prediction MCP . As a result when transmitting the hybrid-coded video in packet loss environments it suffers from error propagations and this leads to the well-known drifting phenomenon 2 3 . Due to the unreliable underlying networks the development of error-resilient video coding techniques are a crucial requirement for video communications .