DMS Network Presntn Fnal

7/31/2019 DMS Network Presntn Fnal

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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.

DMS Network Presntn Fnal

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