Fast variable-size block motion estimation using merging procedure with an adaptive threshold
ICME '03 Proceedings of the 2003 International Conference on Multimedia and Expo - Volume 1
Heterogeneous video transcoding to lower spatio-temporalresolutions and different encoding formats
IEEE Transactions on Multimedia
Transcoder architectures for video coding
IEEE Transactions on Consumer Electronics
Architectures for MPEG compressed bitstream scaling
IEEE Transactions on Circuits and Systems for Video Technology
A frequency-domain video transcoder for dynamic bit-rate reduction of MPEG-2 bit streams
IEEE Transactions on Circuits and Systems for Video Technology
Adaptive motion-vector resampling for compressed video downscaling
IEEE Transactions on Circuits and Systems for Video Technology
An HDTV-to-SDTV spatial transcoder
IEEE Transactions on Circuits and Systems for Video Technology
Overview of the H.264/AVC video coding standard
IEEE Transactions on Circuits and Systems for Video Technology
Effective algorithms for fast transcoding of AVS to H.264/AVC in the spatial domain
Multimedia Tools and Applications
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
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Transcoding is an important technique for reducing the bit rate or spatial resolution to meet the constrained transmission bandwidths and terminal capabilities. In this paper, we propose a spatial downscaling transcoding method to convert an MPEG-2 bitstream into an H.264/AVC bitstream. A novel feature of the proposed method is to focus on the fast mode decision that fully exploits the advantages of variable block-size motion compensation feature in H.264/AVC. In the transcoder, types and motion vectors of pre-encoded macroblocks are considered together to decide the new encoding block type. While maintaining a reasonable image quality, the proposed method significantly reduces the computational complexity and facilitates the video servers to provide multimedia service in real time for heterogeneous clients. Experimental results show that our method is very effective.