Multipoint multimedia conferencing

Clark, William Judson

doi:10.1109/35.137478

Cited by 45 publications

(8 citation statements)

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“…The maxima max{∆ i } of the band difference are summed. The results for 4,6,8,10,20, and 50 video data streams are shown as histograms in Fig. 11.…”

Section: Deviation Of Optimal Transmission Schedulementioning

confidence: 98%

An adaptive QoS control method in the multichannel communication of the MPEG video data streams

Ogawa

Yamaoka

Sakai

2003

Electron. Comm. Jpn. Pt. I

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SUMMARYIn a system in which multiple video streams are simultaneously transmitted and restored over a network in real time, QoS control is usually performed individually and end-to-end. Thus, the quality of the restored video images varies according to the assigned bandwidth. This paper considers MPEG coding of video images and proposes a method of reducing the variation of image quality by integrated QoS control of video images when multiple video streams share a common channel. More precisely, a scaling method is used in which a bit-stream scaling method is selected and applied. A band assignment method is also proposed in which image quality degradation is equalized among the streams, based on the property that piecewiselinear approximation can be applied to the relation between the bit rate and the image quality. A band assignment switching method is proposed for use when the proposed method is applied to the video data streams with frequent scene changes. Quality degradation with an increasing number of streams is discussed.

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“…The maxima max{∆ i } of the band difference are summed. The results for 4,6,8,10,20, and 50 video data streams are shown as histograms in Fig. 11.…”

Section: Deviation Of Optimal Transmission Schedulementioning

confidence: 98%

An adaptive QoS control method in the multichannel communication of the MPEG video data streams

Ogawa

Yamaoka

Sakai

2003

Electron. Comm. Jpn. Pt. I

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“…Earlier work on MCU video design can be traced back to research by Oka and Misawa (1992) on video conference terminals. Clark (1992) also presented a set of multipoint network configurations, which include a mesh, star (centralized) and dumbbell configurations. Similar configurations were also laid out by WillebeekLeMair et al (1994) and Willebeek-LeMair and Shae (1995), with emphasis on distribution of video streams in compressed and pixel domains for a star MCU video architecture.…”

Section: Introductionmentioning

confidence: 99%

Software-based serverless endpoint video combiner architecture for high-definition multiparty video conferencing

Baskaran

Chang

Loo

et al. 2013

Journal of Network and Computer Applications

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“…With recent advances in computer and network technologies, a variety of distributed multimedia applications are becoming more feasible. In a distributed multimedia system, users can access diverse applications, such as computer-supported cooperative works [11], video conferencing systems [1,5], internet surfing (for example, the World Wide Web), and on-demand multimedia services [8] like video-on-demand.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Scheduling of Multimedia Documents in a Single Server Multiple Clients Environment

Ahmad

Lai

1999

Journal of Parallel and Distributed Computing

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In a typical single server and multiple client distributed multimedia system, clients may send sporadic requests to the server for certain multimedia documents. The requests must be served with a fast response time and with the required quality of service guarantee. This requires the server to determine the transmission schedule of each multimedia stream while ensuring necessary inter-and intrastream synchronizations. There are two major drawbacks in the existing scheduling algorithms. First, it is assumed that all channels are available at the beginning of the scheduling, but in reality, requests arrive when others are in service; second, the cost of the scheduling itself is usually ignored. In general a feasible scheduling algorithm should have the following features: (1) the schedule must be generated in real time, (2) it should have small scheduling cost, and (3) it must be capable of handling multiple requests from multiple clients. In this paper, we propose two dynamic scheduling algorithms whose worst time complexity is O(n log nm+nm), where n is the total number of data units in a retrieved multimedia document and m denotes the number of available channels. The salient feature of the proposed algorithms is their inherent dynamic nature which can adjust the scheduling times for each individual request according to the slack time between consecutive requests. If the slack time between two requests is large, the scheduler can run longer in an attempt to find a better solution. This reduces the response time while maintaining a good quality of presentation. Through both simulation and analysis, we evaluate our algorithms and demonstrate their applicability in a realistic environment. 1999Academic Press.

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Multipoint multimedia conferencing

Cited by 45 publications

References 1 publication

An adaptive QoS control method in the multichannel communication of the MPEG video data streams

An adaptive QoS control method in the multichannel communication of the MPEG video data streams

Software-based serverless endpoint video combiner architecture for high-definition multiparty video conferencing

Dynamic Scheduling of Multimedia Documents in a Single Server Multiple Clients Environment

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