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Error-Resilient Video Transimission Using Long-term memory motion-compensated prediction



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1050 IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS VOL 18 NO 6 JUNE 2000 Error Resilient Video Transmission Using Long Term Memory Motion Compensated Prediction Thomas Wiegand Niko F rber Member IEEE Klaus Stuhlm ller and Bernd Girod Fellow IEEE Abstract Long term memory prediction extends the spatial displacement vector utilized in hybrid video coding by a variable time delay permitting the use of more than one reference frame for motion compensation This extension leads to improved rate distortion performance However motion compensation in combination with transmission errors leads to temporal error propagation that occurs when the reference frames at coder and decoder differ In this paper we present a framework that incorporates an estimated error into rate constrained motion estimation and mode decision Experimental results with a Rayleigh fading channel show that long term memory prediction significantly outperforms the single frame prediction H 263 based anchor When a feedback channel is available the decoder can inform the encoder about successful or unsuccessful transmission events by sending positive ACK or negative NACK acknowledgments This information is utilized for updating the error estimates at the encoder Similar concepts such as the ACK and NACK mode known from the H 263 standard are unified into a general framework providing superior transmission performance Index Terms Average distortion H 263 Lagrangian coder control long term memory motion compensated prediction multiframe I INTRODUCTION W ITH continuously dropping costs of semiconductors we might soon be able to considerably increase the memory in video codecs Algorithms to take advantage of such large memory capacities however are in their infancy today This has been the motivation for our research into long term memory motion compensated prediction MCP The efficiency of long term memory MCP as an approach to improve coding performance has been demonstrated in 1 The ITU T has decided to



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