Multi-video-scheme Videoconferencing Applications
نویسنده
چکیده
The videoconferencing applications transmit video and audio data through data networks. The current networks such as the Internet are heterogeneous: their subnets may possess di erent bandwidths. When a videoconference covers subnets of di erent bandwidths, multiple video coding schemes of di erent bandwidth requirements can be used at the same time to make good use of the bandwidth resources. Sometimes di erence of host processing power also leads to using multiple video schemes. In this paper, we discuss multiple video transport sessions of multi-video-scheme (i.e multiple video scheme) videoconferencing applications. Video data in di erent schemes must be transmitted over di erent multicast trees. Thus the multi-video-scheme application creates multiple video transport sessions. We describe the architecture for the multi-video-scheme videoconferencing application as an open system. It consists of mono-video-scheme subsystems with some gateways. Gateways translate and forward video data between the monovideo-scheme subsystems, and forward audio data between these subsystems. We discuss translation for di erent video schemes in two way: direct conversion, and \ rst to decode then to encode". Finally we present a multi-video-scheme videoconferencing application IVS-H261/JPEG on the Internet. IVS-H261/JPEG consists of two mono-video-scheme subsystems IVS-H261 and IVS-JPEG with a gateway IVS-SERV. Key-words: videoconferencing, video scheme, congestion control, Internet.
منابع مشابه
Measuring Interaction QoE in Internet Videoconferencing
Internet videoconferencing has emerged as a viable medium for communication and entertainment. However, its widespread use is being challenged. This is because videoconference end-users frequently experience perceptual quality impairments such as video frame freezing and voice dropouts due to changes in network conditions on the Internet. These impairments cause extra end-user interaction effor...
متن کاملSmart Videoconferencing
The combination of acoustical and video processing to achieve a smart audio and video feed from a set of microphones and cameras is a task that might conventionally be accomplished by camerapersons and control room staff. However, in the context of videoconferencing this process needs to be performed by control software. We discuss the use of a multi-camera multi-microphone set up for unattende...
متن کاملExtending SAR Image Despckling methods for ViSAR Denoising
Synthetic Aperture Radar (SAR) is widely used in different weather conditions for various applications such as mapping, remote sensing, urban, civil and military monitoring. Recently, a new radar sensor called Video SAR (ViSAR) has been developed to capture sequential frames from moving objects for environmental monitoring applications. Same as SAR images, the major problem of ViSAR is the pres...
متن کاملNon-iterative joint decoding of space-time codes and multiuser interference in asynchronous DS-CDMA systems
Space-time coding (STC) is an efficient technique to combat severe fading effects and improve system capacity in wireless communications. However, for CDMA communications, multi-antenna transmission increases the multiuser interference (MUI). In addition, if the data rate is high, the processing gain can be quite small, and thus the MUI is further enhanced. In this paper we propose a new non-it...
متن کاملViDe.Net Middleware for Scalable Video Services for Research and Higher Education
University and research communities have embraced videoconferencing as a useful tool, especially for communication among teams of scientists distributed across numerous institutions and around the globe. Heterogeneous selections of equipment and conferencing protocols, varying dialing instructions, and separately managed operations/user-support centers are current barriers to wider deployment o...
متن کامل