A real-time video transport system for the best-effort Internet

Ni, Zefeng; Chen, Zhenzhong; Ngan, King Ngi

doi:10.1016/j.image.2004.12.004

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…The H.323 standard addresses call signaling, multimedia transport, and bandwidth control for point-to-point and multi-point conferences. It is widely implemented by videoconferencing equipment manufacturers, is used within various Internet real-time applications, and is widely deployed worldwide by service providers and enterprises for both voice and video services over IP networks ( 30 ).…”

Section: H323 Video Conferencing Solutionmentioning

confidence: 99%

Emerging Technologies for Telemedicine

et al. 2012

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This paper focuses on new technologies that are practically useful for telemedicine. Three representative systems are introduced: a Digital Video Transport System (DVTS), an H.323 compatible videoconferencing system, and Vidyo. Based on some of our experiences, we highlight the advantages and disadvantages of each technology, and point out technologies that are especially targeted at doctors and technicians, so that those interested in using similar technologies can make appropriate choices and achieve their own goals depending on their specific conditions.

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Section: H323 Video Conferencing Solutionmentioning

confidence: 99%

Emerging Technologies for Telemedicine

et al. 2012

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“…It is also noted that rate control also plays an important role in video transmissions over wired [108] wireless networks [18]. Although this rate control is a transport approach instead of video source oriented, we are aware that the proper rate control can significantly improve the system performance by reducing time-out effects, packet loss thus enhance the video quality and guarantee quality of service (QoS) [117,70].…”

Section: Discussionmentioning

confidence: 99%

Recent advances in rate control for video coding

Chen

Ngan

2007

Signal Processing: Image Communication

Self Cite

102

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“…After the streaming server determined the desired video sending rate no matter which approach is used, it has to apply some mechanism to shape the bit stream from the video encoder to enforce that rate, i.e video rate adaptation. For example, for live video, this is often achieved by introducing a rate-adaptive video encoding algorithm to the video encoder as in [39,43,44]. For stored video encoded with the developed 3D wavelet based scalable codec, this rate adaptation is relatively straight-forward.…”

Section: Resultsmentioning

confidence: 99%

“…The feedback control scheme could be considered here as rate control from the transport perspective while Bit Allocation is from the video compression perspective. Note this AIMD control scheme has been proven to be TCP friendly with simulation in [39] and with actually experiment in [44]. In other words, even though UDP is used for stream transportation, it will not influence the TCP-friendliness in the best-effort Internet.…”

Section: End-to-end System Designmentioning

confidence: 95%

3D wavelet based scalable video coding and its applications

Ni¹

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Scalable video coding is attractive due to the capability of reconstructing lower spatial resolution, or lower quality, or lower frame rate video signals from partial bit streams. It enables a simple solution in adaptation to different requirements from network, terminal and storage capabilities. In this thesis, a 3D wavelet based scalable video codec (SVC) is proposed through the integration of motion-compensated temporal filtering (MCTF) and JPEG2000. By exploring the unique features of MCTF and JPEG2000, the proposed simple codec not only achieves a comparable rate distortion (RD) performance but also has the properties of high scalability and error resilience. The main contributions of the developed codec lie in its simple architecture and the optimum bit allocation scheme based on the quality layer concept of JPEG2000. For MCTF based video codecs, a fundamental question is how to allocate bits to each temporal band (T-band) generated by MCTF so that certain degree of constant quality can be achieved. In this thesis, a novel approach for constant quality aimed bit allocation is proposed for the applications of adaptive stored video streaming. The basic idea of the proposed bit allocation is to adjust the energy gains to compensate the different contributions from different types of T-bands, and more or less equally distribute the distortions among the T-bands at the same level. Experimental results show that the proposed bit allocation can greatly reduce the PSNR fluctuation with only slight degradation in average PSNR. This thesis also investigates the potential usage for the developed SVC through designing two systems for streaming stored video over two types of networks, the best-effort Internet and QoS-enabled wireless network. For networks without QoS support, such as the present best-effort Internet, an end-to-end system is proposed. In particular, an end-to-end feedback control scheme is performed at the application layer to estimate the i ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library available network bandwidth, which is then used to determine the video bit rate for the streaming session. For QoS-enabled networks, with the example of IEEE802.11e WLAN, a cross-layer design is proposed to optimize received video quality. Specially, at the application layer, the SVC stream is packetized with relative priority index (RPI) that marks the importance of video packets. At the network layer, available bandwidth is estimated and passed to the application layer to guide the truncation of video bit stream. In addition, adaptive QoS mapping is performed based on the RPI value of each packets. Both systems exploit the scalability property of SVC.

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A real-time video transport system for the best-effort Internet

Cited by 8 publications

References 17 publications

Emerging Technologies for Telemedicine

Emerging Technologies for Telemedicine

Recent advances in rate control for video coding

3D wavelet based scalable video coding and its applications

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