Wu, P.-H.P.-H.WuChen, C.C.ChenHOMER H. CHEN2018-09-102018-09-102006https://www.scopus.com/inward/record.uri?eid=2-s2.0-33751501719&doi=10.1109%2fTCSVT.2006.881855&partnerID=40&md5=79fc7644d0d105601dfa59b6ebdfd014http://scholars.lib.ntu.edu.tw/handle/123456789/324267The mismatch between a spatial-domain encoder and a transform-domain decoder due to rounding can cause serious video quality degradation after a series of inter-coded frames. The mismatch is rooted on the fact that rounding is a nonlinear operation, and hence its equivalent in the transform domain does not exist. We analyze the mathematical property of the rounding operation and propose a practical solution that provides an optimal approximation of the rounding operation in the transform-domain. The proposed solution is able to reduce the mismatch and preserve image quality. Experimental results are shown to demonstrate the effectiveness of the solution. © 2006 IEEE.Discrete cosine transform (DCT); Motion compensation; Rounding; Transcoding; Transform domainDiscrete cosine transform (DCT); Rounding; Transcoding; Transform domain; Approximation theory; Cosine transforms; Image quality; Mathematical models; Nonlinear systems; Image codingjournal article10.1109/TCSVT.2006.8818552-s2.0-33751501719