An enhanced screen codec for live lecture broadcasting

Lu, Chenping; Xie, Weidong; Zhang, Zhiqiang

doi:10.1109/icalip.2010.5684999

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…SJSC [24] is an advanced sceen codec developed by our grouop. It combines lossless and lossy compression methods to achieve a good compression ratio while guaranteeing visual quality.…”

Section: Embedding Screen Codec Decodermentioning

confidence: 99%

An Adobe Flash-based screencast solution with customized screen codec

Xie

et al. 2011

Proceedings of the Third International Conference on Internet Multimedia Computing and Service

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Screencast technology is fundamental to many online applications like web conference and online lectures. Due to its wide installed base and cross-platform support, Adobe Flash Player is a natural choice as the platform to implement screencast clients. However, due to the limited types of media encoding formats Flash Player supports natively, current Flash-based screencast solutions are suboptimal in terms of the bit rate needed and the visual quality delivered. By leveraging two less well-known mechanisms of Adobe Flash platform, the FLV Data Tag based Remote Method Invocation and Alchemy C/C++ to Actionscript compiling, we extended Flash Player with the decoding capability of a state-ofthe-art screen codec format named SJSC. According to our evaluation tests, the solution is quite feasible in terms of decoder's CPU/memory usage. A visual quality test also shows the solution can achieve a better bit rate and quality trade-off than existing Flash-based screencast solutions.

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“…SJSC [24] is an advanced sceen codec developed by our grouop. It combines lossless and lossy compression methods to achieve a good compression ratio while guaranteeing visual quality.…”

Section: Embedding Screen Codec Decodermentioning

confidence: 99%

An Adobe Flash-based screencast solution with customized screen codec

Xie

et al. 2011

Proceedings of the Third International Conference on Internet Multimedia Computing and Service

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“…The audio element stream is encoded with Speex. The slideshow element stream is encoded with SJSC+, an special type of video codec designed by us, which is optimized for compressing the image sequences captured from the computer screen [17].…”

Section: System Structurementioning

confidence: 99%

PPClass-M — A live online lecture system optimized for mobile access

Xie

Zhang

et al. 2011

2011 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

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While online lectures has been a mature application for desktop PC, enabling access of live online lectures from smartphones posses some unique challenges which can not be solved with existing desktop-oriented online lecture systems. We designed a new live online lectures system called PPClass-M which is optimized for mobile scenario. It adopts an enhanced HTTP-streaming based streaming protocol which can elegantly handle the interim coverage outage and network switch commonly found in of mobile network as well as better support of the dynamic switch of consumed element streams needed to meet the resource constraints of smartphones. It also features a semi-3D based client GUI design which can deliver better user experience on smartphones with constrained screen size Index Terms-http streaming, online lecture, smart phone, streaming media

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On channel estimation method using time domain sequences in MIMO systems

Liu

Xiong

Gui

et al. 2011

2011 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

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In this paper, we propose an improved chan nel estimation approach based on time-domain correlation in multiple-input multiple-output (MIMO) system. Since orthogonal pseudonoise (PN) sequences are not available, the result of chan nel estimation contains inter-symbol and co-channel interference.This kind of interference is harmful especially when the channel response is long and/or the number of transmitter antennas is large. We consider the deficiency of aforementioned channel estimation and propose an improved algorithm with interference cancellation,and the relative training sequences are presented as well. It is shown that the new technique can provide better performance and the effectiveness is obvious at high SNR.Index Terms-Multiple-input multiple-output (MIMO), chan nel estimation, time-domain sequences, interference cancellation.

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An enhanced screen codec for live lecture broadcasting

Cited by 6 publications

References 5 publications

An Adobe Flash-based screencast solution with customized screen codec

An Adobe Flash-based screencast solution with customized screen codec

PPClass-M — A live online lecture system optimized for mobile access

On channel estimation method using time domain sequences in MIMO systems

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An enhanced screen codec for live lecture broadcasting

Cited by 6 publications

References 5 publications

An Adobe Flash-based screencast solution with customized screen codec

An Adobe Flash-based screencast solution with customized screen codec

PPClass-M &#x2014; A live online lecture system optimized for mobile access

On channel estimation method using time domain sequences in MIMO systems

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Product

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PPClass-M — A live online lecture system optimized for mobile access