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Title: A fast video transcoding algorithm based on hybrid characteristic of multi-scale videos
Authors: Lu, ZY
Jia, KB
Siu, WC 
Keywords: 2D-histogram
Down-sizing video transcoding
Intra prediction
Support vector machine
Issue Date: 2012
Source: Journal of information hiding and multimedia signal processing, 2012, v. 3, no. 1, p. 34-46 How to cite?
Journal: Journal of Information Hiding and Multimedia Signal Processing 
Abstract: As a key technique in network multimedia signal processing, video transcod- ing becomes a hot topic in recent years. This paper presents a fast intra mode deci- sion scheme for down-sizing video transcoding in H.264 based on hybrid characteristic of multi-scale videos. In order to reduce the high computational complexity of using con- ventional intra prediction in the H.264 re-encoder, the proposed scheme firstly utilizes 2D-histogram to extract the spatial characteristic of macro-blocks in the downsized video to choose from intra 16×16 and intra 4×4. Then Support Vector Machine (SVM) is used to exploit the correlation between coding information extracted from the input high- resolution bit-stream and the coding modes of macro-blocks in down-sized video frames. After the SVM classifier, improbable modes in the nine intra 4×4 modes are eliminated and only a small number of candidate modes are carried out using the RDO operations. Hence, remarkable computing time can be saved, up to 74%, while maintaining nearly the same quality of the transcoded pictures.
ISSN: 2073-4212
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