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Distributed multimedia system
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Distributed Multimedia System
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A DMS is an integrated communication ,computing and information system that enablesthe processing, management, delivery andpresentation of synchronized multimedia
information that guarantees QOS
Enhances the human communication byexploiting both visual and aural senses
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An example of DMS
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Main features of DMS
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Technology Integration
Integrates information, communicationand computing system to form a unified digitalprocessing environment.
Multimedia Integration
Accommodates discrete data as wellas continuous data in an integrated
environment. Real Time Performance
Requires the dtorage system,processing systems and transmission systems
to have real time performance
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System wide QOS support
Supports diverse QOS requirementson an end-to-end basis along the data path
from the sender, through the transport networkand to the receiver.
InteractivityRequies duplex communication
between the user and the system and allowseach other to control the information.
Multimedia stream,SynchronizationPresentsthe playback continuity of media frame withina single continuous media stream, andtemporal relationship among multiple related
data objects.5
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Standardization support Allows interoperabilitydespite heterogeneity in the information content,presentation format, user interfaces, networkprotocols and consumers electronic
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Resource Management of DMS
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DMS integrates and manages the information,communication and computing subsystem
End to end QOS guarantees
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Distributed Multimedia Server
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Typically, a multimedia server is connectedthrough an interconnection to clients who requestinformation on demand
The servers store and provide information alongwith other facilities like billing, encryption, etc.
Example: Video server
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Video Server
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Video stream can be taken as an example of theDMS
Requires high I/O bandwidth
Requires high storage Simultaneous access of information is possible
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Important parameters of MultimediaServer
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I/O Bandwidth:
Designates how many clients to be servedsimultaneously
Storage Requirement:
Determines the no. of that can be storedin the server
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Categories of server
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i. Centralized system
ii. Distributed system
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Centralized system
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High end system
Manages video stream centrally
No client request for video stream can be blockedas long I/O bandwidth is available
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Distributed system
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Collection of workstations or PCs
Communication between client and server
High blocking probabilities
Activities between client and server can bedivided into:
Session
Transaction
Services
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Distributed system
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Session:-connection between client and serverTransaction:-
Query:-asks for metadata of video server - not time critical
Video:- sequence of video related activities
- encapsulated by open & close of video file
- time critical
Services:- initiate, terminate or switch videos
- playback, fast forward & slow forwardservices possible
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Distributed Multimedia Applications
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ITV
VOD
Telecooperation
Telemedicine hypermedia
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Components of VOD
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Overview of VOD
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Telecooperation
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Provides electronic shared workplace Information sharing purpose
Also known as Computer Supported CooperativeWork (CSCW)
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Classification of CSCW
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Synchronous distributed:Real time interaction in group
E.g.: chat, multimedia conferencing, real timeediting, etc.
Asynchronous distributed:Exchange of message synchronously in the group
E.g.: e-mail, voice mail, etc
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Classification of CSCW
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Synchronous centralized:
Face to face interaction
Eg: application in the meeting room
Asynchronous centralized:
Activities at the same place but different time
Eg: news group, electronic bulletin board,etc
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Telecooperation infrastructure
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i. Network modelii. System model
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Network model
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System model
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Telemedicine
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Acquiring medial data from appropriate devicesand transfer it to other systems
Medical images: Computer tomography
Magnetic resonance imaging Neucular medicine imaging
Ultrasound imaging
Video stream are compressed before sending it tothe network
JPEG, warelet, etc
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Hypermedia
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Retrieval services and require point to point ormultipoint to point and switched services
Provides user interfaces, powerful, anchoring andpresentation tools
E.g.: encyclopedia, dictionaries, reference book,etc.