A DCT-Domain Video Transcoder for Spatial Resolution Downconversion
VISUAL '02 Proceedings of the 5th International Conference on Recent Advances in Visual Information Systems
A multi-layer motion estimation scheme for spatial scalability in H.264/AVC scalable extension
ICME'09 Proceedings of the 2009 IEEE international conference on Multimedia and Expo
Parabolic Motion-Vector Re-estimation Algorithm for Compressed Video Downscaling
Journal of Signal Processing Systems
A fast downsizing video transcoder based on H.264/AVC standard
PCM'04 Proceedings of the 5th Pacific Rim conference on Advances in Multimedia Information Processing - Volume Part III
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Spatial scalable encoding of visual data has several applications, including browsing visual databases, querying multimedia databases, interactive multimedia communications, etc. To convert a compressed video sequence to a lower spatial resolution compressed video, it may decode the original bit-stream, down-sample each frame, and encode. The computation-intensive motion estimation will be included in the transcoder. The re-use of motion vectors extracted from incoming video bit-streams during transcoding has been widely accepted. This paper proposes a new algorithm to estimate the motion vector of the reduced low-resolution video by only using the original motion vectors and DC coefficients in the compressed bit-stream. By taking into account the spatial activity measurement to generate better prediction for the composed motion vector, higher quality and lower complexity than previous works are achieved by the proposed method