Ch1 Intro to Multimedia

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Prepared by: NKA First Prepared on:1st May 2007 Last Modified on: xxxxxxQuality checked by: AQ

Copyright 2006 Asia Pacific University College of Technology and Innovation

Chapter 1:

Introduction to multimedia &

multimedia system

Icon & Time Based MultimediaCT057-3-2


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Time Based Multimedia CT048-3-2 Introduction to multimedia & multimedia system Slide 2 of 20

Topic & Structure of the lesson

1. To introduce multimedia as a concept

2. Levels of multimedia system

3. Challenges, key issues and desirable features ofmultimedia systems

4. Components of multimedia systems

5. Applications of multimedia systems

6. Current trends in multimedia systems


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Learning Outcomes

1. Define, compare and contrast between the terms, multimedia and

multimedia system.

2. List the various levels of multimedia systems

3. List some challenges, key issues and desirable features of

multimedia applications.

4. Explain the components in a Multimedia System

5. Explain the various types of Multimedia Application available

currently

6. Discuss current trends in Multimedia Application

At the end of this lecture, YOU should be able to:


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Key Terms you must be able to use

If you have mastered this topic, you should be able to use the

following terms correctly in your assignments and exams:

Multimedia and Multimedia System

Text

Animation

Graphics

Audio

Video


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Main Teaching Points

Introduction to multimedia & multimedia system (e.g.

definition)

Levels of multimedia application. Issues associated with multimedia like challenges, key

issues, components and trends will be discussed.


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Introduction to Multimedia, Multimedia Application

and Multimedia Systems.

Chapter 1


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Multimedia can have a many definitions these include:

Multimedia means that computer information can be

represented through audio, video, and animation in

addition to traditional media (i.e., text, graphics/drawings,

images).

Any combination of different media types inclusive of

text, graphics, animations, audio and video.

What is multimedia?



A good general definition is:

Multimedia is the field concerned with the computer-

controlled integration of text, graphics, drawings, still and

moving images (Video), animation, audio, and any other

media where every type of information can be

represented, stored, transmitted and processed digitally.

What is multimedia?



What is a multimedia system?

A system which achieves its aim through the

careful combination of different types of

media

As with all systems a multimedia system mustbe well designed with a clear aim and a set of

objectives which will fulfil that aim.

Multimedia systems by definition will includeseveral different types of media used in

pursuit of the objectives.



Levels of Multimedia Systems

Presentation using multimedia

No interaction

A Video

Interactive Multimedia

User has control of which parts of the system have

focus and when

A DVD

Hypermedia

A structure of linked elements with navigation

A web page



Quick Review Question

Suggest some multimedia applications which are:

Presentation type

Interactive

Hypermedia



Challenges for Multimedia Systems

Distributed Networks

Temporal relationship between data Render different data at same time continuously.

Sequencing within the media Playing frames in correct order/time frame in

video

Synchronisation inter-media scheduling E.g.Video and Audio Lip synchronisation is clearly

important for humans to watch playback of video andaudio and even animation and audio.



Key Issues for Multimedia Systems

The key issues multimedia systems need to deal

with here are:

How to represent and store temporal information.

How to strictly maintain the temporal relationships onplayback/retrieval

What process are involved in the above.

Data has to represented digitally AnalogDigital

Conversion, Sampling etc.

Large Data Requirementsbandwidth, storage,

compression



Desirable Features for a Multimedia

System

Given the key issues mentioned previously thefollowing feature a desirable (if not aprerequisite) for a Multimedia System:

Very High Processing Power needed to deal with large

data processing and real time delivery of media. Special

hardware commonplace.

Multimedia Capable File Systemneeded to deliver real-

time media e.g. Video/Audio Streaming.

Special Hardware/Software needed e.g RAID technology.

Data Representations File Formats that support

multimedia should be easy to handle yet allow for

compression/decompression in real-time.



Continued..

Efficient and High I/O

input and output to the filesubsystem needs to be efficient and fast. Needs to allowfor real-time recording as well as playback of data. e.g.Direct to Disk recording systems.

Special Operating Systemto allow access to file

system and process data efficiently and quickly. Needsto support direct transfers to disk, real-time scheduling,fast interrupt processing, I/O streaming etc.

Storage and Memory large storage units (of theorder of 50 -100 Gb or more) and large memory (50 -100Mb or more).

Network Support Client-server systems common asdistributed systems common.

Software Tools user friendly tools needed to handle

media, design and develop applications, deliver media.



Components of a Multimedia

System

Now let us consider the Components (Hardware and Software)

required for a multimedia system:

Capture devices Video Camera, Video Recorder, Audio

Microphone, Keyboards, mice, graphics tablets, 3D input devices,

tactile sensors, VR devices. Digitising/Sampling HardwareStorage DevicesHard disks, CD-ROMs, Jaz/Zip drives, DVD,etc

Communication NetworksEthernet, Token Ring, FDDI, ATM,

Intranets, Internets.

Computer Systems Multimedia Desktop machines,

Workstations, MPEG/VIDEO/DSP Hardware

Display Devices CD-quality speakers, HDTV,SVGA, Hi-Res

monitors, Colour printers etc.



Applications of Multimedia

Examples of Multimedia Applications include:

World Wide Web

Hypermedia courseware

Video conferencing

Video-on-demand Interactive TV

Groupware

Home shopping

Games

Virtual reality

Digital video editing and production systems

Multimedia Database systems



Trends in Multimedia

Current big applications areas in Multimedia include:

World Wide Web Hypermedia systems embrace

nearly all multimedia technologies and application areas.

MBone

Multicast Backbone: Equivalent of

conventional TV and Radio on the Internet.

Enabling Technologies developing at a rapid rate to

support ever increasing need for Multimedia. Carrier,

Switching, Protocols, Applications, Coding/Compression, Database,

Processing, and System Integration Technologies at the

forefront of this


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Q & A

Question and Answer Session


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Time Based M ltimedia CT048 3 2 Introd ction to m ltimedia & m ltimedia s stem

Next Chapter

Elements of Multimedia

Ch1 Intro to Multimedia

Documents

Transcript of Ch1 Intro to Multimedia