Paper Info
Title
A Mode Mapping And Optimized Mv Conjunction Based H.264/Svc To H.264/Avc Transcoder With Medium-Grain Quality Scalability For Videoconferencing
Abstract
Scalable Video Coding (SVC) is an extension of H.264/AVC, aiming to provide the ability to adapt to heterogeneous networks or requirements. It offers great flexibility for bitstream adaptation in multi-point applications such as videoconferencing. However, transcoding between SVC and AVC is necessary due to the existence of legacy AVC-based systems. The straightforward re-encoding method requires great computational cost, and delay-sensitive applications like videoconferencing require much faster transcoding scheme. This paper proposes a 3-stage fast SVC-to-AVC transcoder with medium-grain quality scalability (MGS) for videoconferencing applications. Hierarchical-P structured SVC bitstream is transcoded into IPPP structured AVC bitstream with multiple reference frames. In the first stage, mode decision is accelerated by proposed SVC-to-AVC mode mapping scheme. In the second stage, INTER motion estimation is accelerated by an optimized motion vector (MV) conjunction method to predict the MV with a reduced search range. In the last stage, hadamard-based all zero block (AZB) detection is utilized for early termination. Simulation results show that proposed transcoder achieves very similar coding efficiency to the optimal result, but with averagely 89.6% computational time saving.
Year
DOI
Venue
2014
10.1587/transfun.E97.A.501
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES
Keywords
Field
DocType
SVC-to-AVC transcoding, MGS scalability, mode mapping, MV conjunction, videoconferencing
Transcoding,Computer architecture,Theoretical computer science,Videoconferencing,Mathematics,Scalability,Grain quality,Embedded system
Journal
Volume
Issue
ISSN
E97A
2
0916-8508
Citations 
PageRank 
References 
0
0.34
7
Authors
3
Name
Order
Citations
PageRank
Lei Sun12615.36
Zhenyu Liu25812.62
Takeshi Ikenaga3618125.50