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• W2766191090 abstract "Dual frame motion compensation for a rate switching network Vijay Chellappa, Pamela C. Cosman and Geoffrey M. Voelker Dept. of Electrical and Computer Engineering, Dept. of Computer Science and Engineering University of California, San Diego La Jolla, CA 92093-0407 Email: {vchellap, pcosman}@ucsd.edu,voelker@cs.ucsd.edu Abstract-Standard video coders often use the im- mediate past frame as a reference frame with motion compensation for video encoding. In this paper, we use dual reference frame motion compensation in the context of high bandwidth to low bandwidth switching such as from an Ethernet connection to a GPRS system. The implementation is based on MPEG-4. Simulation results show that there is a significant gain in the PSNR for relatively static video sequences. Wireless Access Network WLAN Ethernet I Bandwidth I IlMbps - IGbps IOMbps 500kbps IxRTT GPRS 64kbDs ldkbps TABLE I NETWORKS SUPPORTED BY T H E ABC F R A M E W O R K I. INTRODUCTION Standard video coders use temporal coding with motion compensation to achieve compression gains. This is based on the assumption that the past frame is highly correlated with the current frame. We propose to use dual frame motion compensation in wireless network settings that experience significant transi- tions in network capacity, such as those produced by network handoffs while using services such as Always Best Connected (ABC) [I]. B. Duuljkme motion compensation In multiple frame prediction, the encoder uses more than one reference frame for motion compen- sated prediction. A dual frame encoder is a special case of a multiple frame encoder, in which two frames are used for motion compensation; they are often called the short-term past frame and the long- term past frame. The idea of using a long-term past frame as an additional reference frame for motion compensation was considered in several papers [2], [3], [4], [SI as well as in the recent H.264 standard. [2] is one of the earliest papers to employ multiple frames for motion compensation to reduce the number of bits required to code the difference signal. Substantial coding gains were reported. In [3], a multi-frame extension was proposed to the single frame reference temporal coding. This was shown to yield improved com- pression efficiency because of the extended search provided by additional frames for Block Motion Compensation, It was further shown that this multi- frame extension was robust to wireless channel losses, where the channel was modelled as a multi- state Markov chain. Error resilience was obtained by randomly choosing among the stored frames A. The ABC network With the widespread use of wireless access net- works and the deployment of 3G services, connec- tivity service to the Internet with mobile devices such as PDAs and laptops needs to be maintained. The ABC service assists the user by automatically handling selection of access networks based on net- work availability and user preferences. Table I shows the various access networks supported by the ABC service. The ABC network provides the framework for a user who wants to connect to a service to be able to choose network access and devices in a way that best suits his or her needs, and to change networks when something better becomes available. 0-7803-8104-1/03/$17.00 02003 IEEE" @default.
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• W2766191090 date "2003-11-01" @default.
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• W2766191090 title "Dual frame motion compensation for a rate switching network - eScholarship" @default.
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