Browsing by Author "Chen, Wen"

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Analysis of Template Matching Prediction and Its Application to Parametric Overlapped Block Motion Compensation
(2010)
Wang, Tse-Wei
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Chen, Wen
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Peng, Wen-Hsiao
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資訊工程學系
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Department of Computer Science
Template matching prediction (TMP), which estimates the motion for a target block by using its surrounding pixels, has been observed to perform efficiently in inter-frame coding. In this paper, we expose, from a more theoretical viewpoint, the factors that determine the prediction efficiency of TMP. It is shown that the motion estimate found by template matching tends to be the motion associated with the template centroid and that TMP consistently outperforms SKIP prediction, but hardly competes with block motion compensation (BMC) unless both the motion and intensity fields are less random or have high spatial correlation. We also demonstrate how template and block motion estimates can jointly be applied in a parametric overlapped block motion compensation (OBMC) framework to further improve temporal prediction. Preliminary results show that combining TMP with OBMC can yield 2-16% reductions in mean-square prediction error, as compared with the single use of OBMC. The gain is even higher (18%) when the performance is compared with that of the standard BMC.
Design and Implementation of An Offloading Technology for 3.5G Networks
(2010)
Lin, Yi-Neng
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Chen, Wen
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Tsai, Shan-Chi
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Lin, Yi-Bing
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交大名義發表
Improving cellular backhaul capacity in the Universal Mobile Telecommunications System (UMTS) has long been desired, and is even demanding now due to the ever-advancing access technologies. Considering the pricy traditional leased line solution, it is tempting to devise a cost-effective alternative. In this work, we propose an offloading technology in order to divert a major part of the backhaul traffic to links that are more cost affordable. An experimental system is prototyped and tested. Measurements indicate good performance of our approach.