tailieunhanh - Báo cáo hóa học: " Error-resilient video coding with end-to-end ratedistortion optimized at macroblock level"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Error-resilient video coding with end-to-end ratedistortion optimized at macroblock level | Xiao et al. EURASIP Journal on Advances in Signal Processing 2011 2011 80 http content 2011 1 80 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Error-resilient video coding with end-to-end ratedistortion optimized at macroblock level Jimin Xiao1 2 Tammam Tillo 2 Chunyu Lin3 and Yao Zhao3 Abstract Intra macroblock refreshment is an effective approach for error-resilient video coding. In this paper in addition to intra coding we propose to add two macroblock coding modes to enhance the transmission robustness of the coded bitstream which are inter coding with redundant macroblock and intra coding with redundant macroblock. The selection of coding modes and the parameters for coding the redundant version of the macroblock are determined by the rate-distortion optimization. It is worth mentioning that the end-to-end distortion is employed in the optimization procedure which considers the channel conditions. Extensive simulation results show that the proposed approach outperforms other error-resilient approaches significantly for some video sequences the average PSNR can be up to 4 dB higher than that of the Optimal Intra Refreshment approach. Keywords AVC error resilience end-to-end distortion intra refreshment redundant coding I. Introduction The AVC 1 video coding standard provides higher coding efficiency and stronger network adaptation capability in comparison with all the previously developed video coding standards. However as previous video compression standards it is based on a hybrid coding method which uses transform coding with Motion-Compensated Prediction MCP . Therefore when the hybrid-coded video bit-stream is transmitted over packet loss networks 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 techniques is a crucial requirement for video .