1. MUTIMEDIA TECHNOLOGIES
Teacher:
Faraz khan
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2. Introduction, History, Terminologies and
LECTURE 1
Introduction, History, Terminologies and
Applications
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3. Introduction to Multimedia
First consider what constitutes media. Some examples of media are:
Ỗ Animation
Ỗ Sound
Ỗ Graphics
Ỗ Text
Ỗ Video
Ỗ Photography
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4. Technologies Hardware Software Storage Bandwidth Devices
Formats and compressions
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5. Introduction to Multimedia
Multimedia involves the combination of two or more media types to effectively create a sequence of events that will communicate an idea usually with both sound and visual support. Typically, multimedia productions are developed and controlled by computer.
The enabling force behind multimedia is digital technology. Multimedia today represents the convergence of digital control and digital media - the PC as the digital control system and the digital media being today's most advanced forms of audio and video storage and transmission.
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6. Introduction to Multimedia
Multimedia = "Multiple" + "media"
combination of text, image, computer graphics, animation, sound, and video.
Inveractive Multimedia - allow user to control each media
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.
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7. Introduction to Multimedia System
What is a multimedia system?
A multimedia system supports the integrated storage, transmission and representation of the discrete media types text, graphics and image and the continuous media types audio and video on a digital computer.
Text, ....
Speech, Audio
Video
Animation
(Still Image)
Digitalize
Interactive
Playback
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8. History of Multimedia Systems
Newspaper were perhaps the first mass communication medium to employ Multimedia, they used mostly text, graphics, and images.
In 1895, Gugliemo Marconi sent his first wireless radio transmission at Pontecchio, Italy. A few years later (in 1901) he detected radio waves beamed across the Atlantic. Initially invented for telegraph, radio is now a major medium for audio broadcasting.
Television was the new media for the 20th century.
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9. What is HyperText and HyperMedia?
Hypertext is a text which contains links to other texts. The term was invented by Ted Nelson around Hypertext is therefore usually non-linear (as indicated below).
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10. Definition of Hypermedia
Hypermedia can include other media, e.g., graphics, images, and especially the continuous media - sound and video. Apparently, Ted Nelson was also the first to use this term.
The World Wide Web (WWW) is the best example of hypermedia applications
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11. Ỗ Multimedia systems must be computer controlled.
Characteristics of a Multimedia System
A Multimedia system has four basic characteristics:
Ỗ Multimedia systems must be computer controlled.
Ỗ Multimedia systems are integrated.
Ỗ The information they handle must be represented digitally.
Ỗ The interface to the final presentation of media is usually
interactive
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12. Challenges for Multimedia Systems
Multimedia systems may have to render a variety of media at the same instant -- a distinction from normal applications. There is a temporal relationship between many forms of media (e.g. Video and Audio)
There are 2 forms of problems here
Sequencing within the media :
Playing frames in correct order/time frame in video
Synchronization
inter-media scheduling (e.g. Video and Audio). Lip synchronization is clearly important for humans to watch playback of video and audio and even animation and audio.
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13. The key issues multimedia systems
Ỗ How to represent and store temporal information?
Ỗ How to strictly maintain the temporal relationships on play back/retrieval?
Ỗ What process are involved in the above?
Ỗ Data has to represented digitally so many initial source of data needs
to be digitise -- translated from analog source to digital representation.
They will involve scanning (graphics, still images), sampling
(audio/video) although digital cameras now exist for direct scene to
digital capture of images and video.
Ỗ The data is large several Mb easily for audio and video – therefore
storage, transfer (bandwidth) and processing overheads are high. Data
compression techniques very common.
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14. Desirable Features for a Multimedia System
Given the above challenges the following feature a desirable (if not a prerequisite) 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 System
Needed 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
Data representations/file formats should be easy to handle yet allow for compression/decompression in real-time.
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15. Special Operating System
Efficient and High I/O
Input and output to the file subsystem needs to be efficient and fast. Needs to allow for real-time recording as well as playback of data. e.g. Direct to Disk recording systems.
Special Operating System
To allow access to file system and process data efficiently and quickly. Needs to support direct transfers to disk, real-time scheduling, fast interrupt processing, I/O streaming etc.
Storage and Memory
Large storage units (of the order of Gb or more) and large memory ( Mb or more). Large Caches also required and frequently of Level 2 and 3 hierarchy for efficient management.
Network Support
Client-server systems common as distributed systems common.
Software Tools
User friendly tools needed to handle media, design and develop applications, deliver media.
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16. Components of a Multimedia System
Capture devices
Video Camera, Video Recorder, Audio Microphone, Keyboards, mice, graphics tablets, 3D input devices, tactile sensors, VR devices. Digitising/Sampling Hardware
Storage Devices
Hard disks, CD-ROMs, Jaz/Zip drives, DVD, etc
Communication Networks
Ethernet, Token Ring, FDDI, ATM, Intranets, Internets.
Computer Systems
Multimedia Desktop machines, Workstations, MPEG/VIDEO/DSP Hardware
Display Devices
CD-quality speakers, HDTV,SVGA, Hi-Resolution monitors, Color printers etc.
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17. Applications Ỗ World Wide Web Ỗ Hypermedia courseware
Ỗ Video conferencing
Ỗ Video-on-demand
Ỗ Interactive TV
Ỗ Groupware
Ỗ Home shopping
Ỗ Games
Ỗ Virtual reality
Ỗ Digital video editing and production systems
Ỗ Multimedia Database systems
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18. Ỗ Business Reference
Encyclopedias, census data, yellow pages, atlases and street directories are examples of CD reference titles. In many cases they are electronic versions of reference books. The challenge for the developer is to make it easy for the user to find the desired information and to effectively use other multimedia elements such as sound, video and animation
Ỗ Education
Multimedia has the ability to accommodate different learning styles and can present material in a non linear manner. It is motivating, it can be highly interactive, it can provide feedback and evaluate skills.
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19. Ỗ Training
Every company has a need to train its employees on a wide range of subjects from personnel policy to equipment maintenance. A number of companies are now training employees using multimedia enhanced training materials. Sometimes this is done with off the shelf multimedia titles but many companies are producing their own in-house multimedia training products. The Boeing company, for instance, has an entire training division dedicated to developing multimedia titles that instruct mechanics and pilots on new aircraft systems.
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20. Ỗ Entertainment
Drawing the line between education and entertainment in multimedia can be almost impossible, hence the term 'edutainment'. Multimedia can make learning entertaining.
But multimedia also has a purely entertainment side. Anything that's possible in sound and images is possible on a multimedia CD.
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21. Ỗ Business
As businesses have the need to communicate with the outside world, multimedia processes offer a wide variety of options for business presentations, marketing and sales. Multimedia can be used at trade shows or to produce electronic catalogues. The marketing of new products can be greatly enhanced by using multimedia, these products can be marketed in a manner that will provide more detailed and stimulating information than printed media.
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22. Ỗ Presentations
Thousands of multimedia presentations are made in the business world every day. Company CEOs give their annual report to a meeting of stockholders. Sales reps pitch their product line to a group of potential customers. A conference keynote speaker tells an audience about industry trends. From an electronic slide show to an interactive video display multimedia can enhance a presentation.
Multimedia provides the presenter with the tools to attract and focus the audience's attention, reinforce key concepts and enliven the presentation.
The following software programs progress from basic presentation to complete authoring capabilities:
Microsoft PowerPoint
Adobe Premiere
Macromedia Director
Macromedia Authorware
Asymmetrix ToolBook
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23. Ỗ Interactive Games
Multimedia means interaction, and to many interactive entertainment means games. Game developers were the pioneers in the use of multimedia and still provide the most innovative and interactive applications of multimedia.
In order to attract, engage, captivate and challenge the user multimedia provides the fast action, vivid colours, 3D animations and elaborate sound effects that are essential to entertainment.
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24. Questions?
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