NDLI: A real time software-only H.261 codec

Content Provider	IEEE Xplore Digital Library
Author	Wang, K. Normile, J. Hsi-Jung Wu Ponceleon, D. Chu, K. Kah-Kay Sung
Copyright Year	1995
Description	Author affiliation: Adv. Technol. Group, Apple Comput. Inc., Cupertino, CA, USA (Wang, K.; Normile, J.; Hsi-Jung Wu; Ponceleon, D.; Chu, K.; Kah-Kay Sung)
Abstract	Video and audio conferencing over networks is becoming increasingly popular due to the availability of video and audio I/O as standard equipment on many computer systems. So far, many algorithms have concentrated on playback only capability. This generally results in unacceptable real-time performance with respect to latency and encoder complexity. We describe a software-only system that allows full duplex video communication. For our analysis and implementation we chose a DCT based method that uses motion estimation and is modelled on the CCITT H.261 standard. We discuss the algorithm, followed by an analysis of the computational requirements for each major block. The results presented show the effect of computational simplifications on signal to noise ratio and image quality. We also examine the processing needs for full resolution coding and project when this will become available.
Starting Page	2719
Ending Page	2722
File Size	400213
Page Count	4
File Format	PDF
ISBN	0780324315
ISSN	15206149
DOI	10.1109/ICASSP.1995.480123
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-05-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Codecs Videoconference Availability Computer networks Delay Discrete cosine transforms Motion estimation Algorithm design and analysis Signal to noise ratio Image quality
Content Type	Text
Resource Type	Article

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