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Bit Rate Control for Real-time Multipoint Video Conferencing

Hu, Xiaoping (2003) Bit Rate Control for Real-time Multipoint Video Conferencing. Master's Thesis, University of Pittsburgh. (Unpublished)

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With the rapid development of video compression and network technology, real-time video communications has become a popular part of our daily life. Rate control is needed to satisfy the expectation of high quality and to make it possible to transmit over limited bandwidth. The objective of this thesis is to design a rate control scheme for a real-time Transcoding-Compositing Multipoint Video Conferencing System, which operates exclusively in the DCT domain. In this Transcoding-Compositing system, the mode of the composited frame should firstly be decided before encoding the composited image. A mode decision method relying on Karhunen-Loeve scene change detection is proposed. A new linear source Rate-Distortion model is developed in the - domain ( is the percentage of zero), based on which rate control scheme is designed. The designed rate control scheme is parted into three levels: Frame Level, Sub-frame Level, and Macroblock Level. Frame Level rate control decides the bit budget for each frame based on the buffer fullness. Sub-frame Level rate control optimizes the distribution of the bit budget among the decimated sub-images. Based on the linear source model, Macroblock Level rate control carries out an adaptive procedure to precisely control the number of encoding bits for each sub-image.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Hu, Xiaopingxih7@pitt.eduXIH7
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairChaparro, Luis Fchaparro@ee.pitt.eduLFCH
Committee MemberLi, Ching-Chungccl@ee.pitt.eduCCL
Committee MemberLee,
Date: 3 September 2003
Date Type: Completion
Defense Date: 24 July 2003
Approval Date: 3 September 2003
Submission Date: 24 July 2003
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical Engineering
Degree: MSEE - Master of Science in Electrical Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: rate control; video conferencing
Other ID:, etd-07242003-215215
Date Deposited: 10 Nov 2011 19:53
Last Modified: 15 Nov 2016 13:46


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