Video transcoder architectures for bit rate scaling of H.263 bit streams
MULTIMEDIA '99 Proceedings of the seventh ACM international conference on Multimedia (Part 1)
Motion vector refinement for high-performance transcoding
IEEE Transactions on Multimedia
Motion estimation for high performance transcoding
IEEE Transactions on Consumer Electronics
Performance evaluation of transcoding algorithms for H.264
IEEE Transactions on Consumer Electronics
A frequency-domain video transcoder for dynamic bit-rate reduction of MPEG-2 bit streams
IEEE Transactions on Circuits and Systems for Video Technology
Probabilistic partial-distance fast matching algorithms for motion estimation
IEEE Transactions on Circuits and Systems for Video Technology
Highly efficient predictive zonal algorithms for fast block-matching motion estimation
IEEE Transactions on Circuits and Systems for Video Technology
An HDTV-to-SDTV spatial transcoder
IEEE Transactions on Circuits and Systems for Video Technology
Drift compensation for reduced spatial resolution transcoding
IEEE Transactions on Circuits and Systems for Video Technology
Model-based transrating of H.264 coded video
IEEE Transactions on Circuits and Systems for Video Technology
Annotation based personalized adaptation and presentation of videos for mobile applications
Multimedia Tools and Applications
On the advantages of the use of bitstream extraction for video summary generation
MMM'10 Proceedings of the 16th international conference on Advances in Multimedia Modeling
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MPEG-4 AVC (H.264) has been recently approved and is rapidly being adopted for applications including HD-DVD and satellite broadcast. To facilitate inter connectivity between different applications using MPEG-4 AVC, transcoding will be a key factor. When requantizing a bitstream, the incoming coding decisions are usually kept unchanged in order to reduce complexity. However, this can have a major impact on the coding efficiency. This paper proposes a novel mode refinement algorithm for inter prediction when requantizing MPEG-4 AVC bitstreams. The proposed approach produces a quality comparable to a full search with only 10% of its complexity, by exploiting the statistical properties of the mode distribution to enable restricted motion vector refinement. Moreover, it enables a trade off between complexity and quality by adapting the algorithm to the computational resources available.