Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13578
Title: A dynamic video combiner for multipoint video conferencing using wavelet transform
Authors: Fung, KT
Siu, WC 
Law, NF 
Issue Date: 2002
Publisher: Institute of Electrical and Electronics Engineers Inc.
Source: Proceedings - 2002 IEEE International Conference on Multimedia and Expo, ICME 2002, 2002, v. 2, 1035363, p. 17-20 How to cite?
Abstract: A new architecture of video combiner for multipoint video conferencing is proposed. The proposed video combiner is wavelet-based which extracts the motion activities information from the video bitstreams produced by a wavelet-based video coder. Using the progressive properties of wavelet transform, the encoded bitstream become scalable. Hence, the video quality of inactive sub-sequences can be easily adjusted in the video combiner by discarding the fine detail information bitstreams. In other words, more bits can be reallocated to the active sub-sequences to achieve a good visual quality with smooth motion. In addition, the video coder is region-based so that different wavelet kernels can be used for the foreground and the background. This setting can on one hand reduce the computational complexity significantly. On the other hand, by considering the unequal importance of various regions, a high video quality in foreground can always be guaranteed and an acceptable quality in background can be maintained even under low bitrate environments. Since the video combiner only needs to rearrange the video quality level according to their motion activities, no re-encoding process is required. Therefore, a significant computational complexity saving can be achieved as compared to the conventional video combiner using a transcoding approach. The new video combiner is then used to realize a multipoint video conferencing and some results are presented to show the improvement in performance due to our proposed architecture.
Description: 2002 IEEE International Conference on Multimedia and Expo, ICME 2002, 26-29 August 2002
URI: http://hdl.handle.net/10397/13578
ISBN: 0-7803-7304-9
DOI: 10.1109/ICME.2002.1035363
Appears in Collections:Conference Paper

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