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)
An efficient complexity-scalable video transcoder with mode refinement
Image Communication
MPEG-4 to H.264 transcoding with frame rate reduction
Multimedia Tools and Applications
A fast MPEG-2 to H.264 downscaling transcoder
ISCGAV'08 Proceedings of the 8th conference on Signal processing, computational geometry and artificial vision
Compressed-domain techniques for error-resilient video transcoding using RPS
IEEE Transactions on Image Processing
Motion-compensated frame rate up-conversion for reduction of blocking artifacts
ICIC'07 Proceedings of the intelligent computing 3rd international conference on Advanced intelligent computing theories and applications
A novel approach for improving the quality of service for wireless video transcoding
Journal of Mobile Multimedia
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Traditionally, the re-use of motion vectors extracted from incoming video bit-stream during transcoding has been widely accepted. However, this simple re-use scheme introduces significant quality degradation in many applications including the situation when the frame-rate conversion is needed. In this paper, we analyzed the quantization errors that cause the extracted motion vectors to be non-optimal and we performed simulations to show the quality degradation due to the inaccurate motion vectors during transcoding. To improve the video quality, we proposed an adaptive motion vector refinement. With a highly reduced computational complexity, the proposed adaptive motion vector refinement achieves significant quality improvement in comparison to the conventional motion vector re-use scheme. In addition, the adaptive motion vector refinement is almost as good as performing a new full-scale motion estimation