Rounding mismatch between spatial-domain and transform-domain video codecs
Journal
IEEE Transactions on Circuits and Systems for Video Technology
Journal Volume
16
Journal Issue
10
Pages
1286-1293
Date Issued
2006
Author(s)
Abstract
The 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.
Subjects
Discrete cosine transform (DCT); Motion compensation; Rounding; Transcoding; Transform domain
Other Subjects
Discrete cosine transform (DCT); Rounding; Transcoding; Transform domain; Approximation theory; Cosine transforms; Image quality; Mathematical models; Nonlinear systems; Image coding
Type
journal article