Multimedia Chapter 1 Introduction to Multimedia Dhekra BEN SASSI

What is Multimedia? Derived from the word “Multi” and “Media”  Multi  Many, Multiple,  Media  means for conveying information: - Media in the press, newspaper, radio and TV context - mass media - Media in communications: cables, satellite, network – transmission media - Media in computer storage: floppy, CD, DVD, HD, USB – storage media - Media in HCI context: text, image, audio, video, CG – interaction media

Definition of Multimedia Multimedia: refers to various information forms text, image, audio, video, graphics, and animation in a variety of application environments. In terms of computing, four fundamental multimedia attributes : - Digitized : All media including audio/video are represented in digital format - Distributed : The information conveyed is remote, either pre-produced and stored or produced in realtime, distributed over networks - Interactive : It is possible to affect the information received, and send own information, in a non-trivial way beyond start, stop, fast forward - Integrated : The media are treated in a uniform way, presented in an orchestrated way, but are possible to manipulate independently

Definition of Multimedia Multimedia: Computer-based techniques of text, images, audio, video, graphics, animation, and any other medium where every type of information can be represented, processed, stored, transmitted, produced and presented digitally TEXT AUDIO GRAPHIC VIDEO ANIMATION

Elements of Multimedia TEXT AUDIO GRAPHIC VIDEO ANIMATION A broad term for something that contains words to express something. Text is the most basic element of multimedia. A good choice of words could help convey the intended message to the users (keywords). Used in contents, menus, navigational buttons Text - ASCII/Unicode, HTML, Postscript, PDF

Elements of Multimedia GRAPHIC TEXT AUDIO GRAPHIC VIDEO ANIMATION Two-dimensional figure or illustration Could be produced manually (by drawing, painting, carving, etc.) or by computer graphics technology. Used in multimedia to show more clearly what a particular information is all about (diagrams, picture).

Elements of Multimedia AUDIO TEXT AUDIO GRAPHIC VIDEO ANIMATION Produced by vibration, as perceived by the sense of hearing. In multimedia, audio could come in the form of speech, sound effects and also music score

Elements of Multimedia ANIMATION TEXT AUDIO GRAPHIC VIDEO ANIMATION The illusion of motion created by the consecutive display of images of static elements. In multimedia, animation is used to further enhance / enriched the experience of the user to further understand the information conveyed to them.

Elements of Multimedia VIDEO TEXT AUDIO GRAPHIC VIDEO ANIMATION Is the technology of capturing, recording, processing, transmitting, and reconstructing moving pictures. Video is more towards photo realistic image sequence / live recording as in comparison to animation. Video also takes a lot of storage space.

Classification of Multimedia Discrete Media (DM, Static): text, image, graphics Continuous Media (CM, Dynamic): audio, video, animation Hyper Media: A combination of hypertext, graphics, audio, video, (linked elements) and interactivity culminating in a complete, non-linear computer-based experience

Example Example of Hyper Media Main Page 1.Video link 2.Image link 3.Audio Link

Linear VS Non-Linear Linear: A Multimedia Project is identified as Linear when:  It is not interactive  User have no control over the content that is being showed to them. Example:  A movie

Linear VS Non-Linear Non-Linear: A Multimedia Project is identified as Non-Linear when:  It is interactive  Users have control over the content that is being showed to them.  Users are given navigational control Example:  Games

Authoring Tools Use to merge multimedia elements (text, audio, graphic, animation, video) into a project. Designed to manage individual multimedia elements and provide user interaction (if required).

Authoring Tools Example:

Importance of Multimedia There are a number of fields where multimedia could be of use. Examples are:-  Business  Education  Entertainment  Home  Public Places

Importance of Multimedia Business  Use and Applications  Sales / Marketing Presentation  Trade show production  Staff Training Application  Company Kiosk

Importance of Multimedia Education  Use and Applications  E-Learning / Distance Learning  Information Searching Entertainment  Use and Applications  Games (Leisure / Educational)  Movies

Importance of Multimedia Home  Use and Applications  Television  Satellite TV  SMS services (chats, voting, reality TV) Public Places  Use and Applications  Information Kiosk  Smart Cards

Importance of Multimedia Digital audio/video is revolutionizing music, film, game, and video & audio industries Convergence of computers, telecommunication, radio, and TV – Caused by technology and competition – Dramatic changes in products and infrastructure New application potential – Huge potential markets – Improving our lives (learning, entertainment, and work) Interesting technical issues

Forces Driving the Multimedia Revolution Evolution of communication and data networks Ubiquitous access to network: Via local-area networks (LAN), wireline and wireless networks, Internet, world wide web, “anywhere, anytime”. Fast processor and large capacity storage devices: including 3-D hardware. Moore’s law: computation and memory capacity of chips doubles every 18 months

Forces Driving the Multimedia Revolution New algorithms and data structures. Compression techniques, graphics… Smart terminals such as digital phones, screen phones…, accessing and interacting the network with wired and wireless connections. The digitization of virtually any device : cameras, video capture and playback devices, handwriting terminals, sound capture, etc., and the digitization of text/audio/video documents and libraries that allows better communications, storage, and fast access and browsing.