Lecture #2: Introduction to Multimedia Computing & Communication

Transcription

1 Lecture #2: Introduction to Multimedia Computing & Communication Lecturer: Abdusy Syarif Undergraduate Course Informatic Engineering Dept.

2 WHAT ARE MULTIMEDIA COMPUTING AND COMMUNICATIONS? Slide - 2

3 Introduction Search for Multimedia resource 1. Search Engine Google: Approximately 150 million searches per day ( per Google s web site) Inktomi :Approximately 80 million searches per day (per SearchEngineWatch.com) AltaVista : Approximately 50 million searches per day (per SearchEngineWatch.com) Slide - 3

4 Search for Multimedia resource (Con t) Search Engine (con t) Direct Hit : Aapproximately 20 million searches per day (per SearchEngineWatch.com) FAST :Approximately 12 million searches per day (per SearchEngineWatch.com) Galaxy: Approximately 100,000 visitors per day (per Galaxy s web site) Search Key Word, Search Option, File type Slide - 4

5 Media refer to the types of information or types of information carriers, such as alphanumeric data, images, audio, and video. Common classifications of Media are based on physical formats and media relationships with time. Slide - 5

6 Media There are two classes of media: 1. Static do not have a time dimension their contents and meanings do not depend on the presentation time. Static media include alphanumeric data, graphics, and still images. Slide - 6

7 Media Classes 2. Dynamic (or time continuous) have a time dimension, the meanings and correctness depend on the rate at which they are presented. these media include animation, audio, and video (which have their intrinsic unit interval or rate). Slide - 7

8 Media Classes To have a perceptually smooth movement, video must be played back at 25 frames (or 30 frames, depending on the video system used) per second. Similarly, when we play back a recorded voice message or music, only one playback rate is natural or sensible. Playback at a slower or faster rate distorts the meaning or the quality of the sound. Slide - 8

9 Example: Because the media must be played back continuously at a fixed rate, they are often called continuous media. They are also called isochronous media because of the fixed relationship between each media unit and time. Slide - 9

10 Media Classes So what is the definition for multimedia systems? Slide - 10

11 Definition Systems which are capable of handling at least one type of continuous media in digital form as well as static media Slide - 11

12 Definition Common Functions: Capturing Transmission Presentation Generate Store Searching Retrieval Process Recognition Enhancement Multimedia Information Slide - 12

13 Multimedia System functions 2 common aspects: Capturing Transmission Presentation Generate Store Searching Retrieval Process Recognition Enhancement Communication aspect Computing aspect Slide - 13

14 Multimedia System aspects Compression? Slide - 14

15 Example: Why Digital Representations? Slide - 15

16 Digital Representation computer systems only handle digital data can easily be integrated with other data types can share the common computing resources and networks it is easier to interact with digital media by using a computer system easier to be secured more reliable (ie: error tolerance to noise) Slide - 16

17 Advantages of Digital Form Slide - 17

18 Example to improve the transfer of information by involving the participant s simultaneous use of two or more senses. to emulate human communications and to assist the human being in organizing and managing vast amounts of information in various media types. Slide - 18

19 Motivation Video/Movie on Demand Information on Demand Education Telemedicine Videophone and Videoconference Cooperative Work Slide - 19

20 Application Video on Demand Currently, we watch TV programs and movies passively: we cannot interact with the programs and cannot control the time we want to watch them. Video/movie on demand services are being developed to overcome these limitations and provide other capabilities. In VOD, large collections of video are stored on video servers. Users or clients access these videos through a network. Slide - 20

21 Distinct features of VOD are: We do not have to leave home to watch our favorite video. Our advanced television is connected to video servers through an advanced network. All we need to do is to dial a number and select the video through a user-friendly menu on the TV screen. Because video servers are centralized and provide services to a large population, their collections are large and updated. If one video server does not have the video we want, it may refer us to some other servers that likely hold the video. In theory, we can watch what we want without leaving home. Further, many users can view the same video without users knowing. So there will be no such problem as Sorry, the video is out. We can watch our favorite video or movies anytime we want. We can pause and fast-forward and -backward. We may also be able to search for a particular scene. We have guaranteed high quality because video is stored in digital form. The quality will not degrade with increased viewings. Slide - 21

22 Slide - 22

23 What Could be a Success Story: Fabplayer Powered by TU Delft Slide - 23

24 Information on Demand A similar system to VOD. The major difference is that IOD stores other types of information as well as video. IOD systems have many applications, including: Acting as a general encyclopedia of general information; Providing newspaper and magazine online services; Providing home shopping service one can view the product and service on the screen and order goods and services without leaving home; Providing current information on weather, public transport time tables, and the like on-line. Slide - 24

25 Multimedia systems can be classified into standalone and distributed systems Slide - 25

26 Classes of Multimedia System Four basic classes/services (ITU): 1.Conversational services 2. Messaging services 3. Retrieval services 4. Distribution services Slide - 26

27 Distributed Multimedia System imply interaction between a human user and another human user or a system. includes interpersonal services such as videoconference and videophony. also includes services such as telesurveillance and tele-shopping. Slide - 27

28 1. Conversational Services Messaging services cover the non-real-time or asynchronous exchange of multimedia data through electronic mailboxes. Slide - 28

29 2. Messaging Services cover all types of access to multimedia information servers. typically, the user sends a request to the server and the requested information is delivered to the user in real time. VoD is an example of these services. Slide - 29

30 3. Retrieval Services cover services where the information is distributed on the initiative of a server An example of these services is TV program broadcast Slide - 30

31 4. Distribution services Multimedia data have a time dimension Multimedia applications normally use multiple related media simultaneously Multimedia data are data intensive Multimedia data do not have obvious syntax and semantics Need QoS guarantees Efficiently used of system resources Slide - 31

32 Challenges So, the central design issue of multimedia systems: How to provide QoS guarantees to applications while using system resources efficiently.. Slide - 32

33 Central Issue Slide - 33

34 Any Questions / Comments? Project 1.1 Kunjungi min. 2 web interaktif yang memasarkan alat transportasi (mobil, motor, sepeda, kereta, pesawat, perahu, dll) yang berbeda. Utk setiap web yang Anda kunjungi tulislah : - Alamat URL - Deskripsi GUI, elemen navigasi apa yg dimiliki? Warna yang digunakan? Apakah susunan kacau? - Deskripsikan setiap presentasi multimedia dari produk mereka. Bentuk yang digunakan? Slide - 34

35 Research Project 1 Project 1.2 Tinjaulah minimal 2 judul CD-ROM Multimedia. Lalu tulislah : - Judul CD - Deskripsikan antarmuka grafis. Elemen navigasi yang dimiliki? Warna yang digunakan? Apakah susunannya kacau? - Deskripsikan isi CD-ROM? Apakah diorganisasikan dengan baik? Apakah Anda dapat mempelajarinya dengan mudah? - Deskripsikan produk yang menggunakan multimedia? - Jelaskan apakah isi multimedianya sesuai dengan isi? Slide - 35

36 Research Project 1 THE END Slide - 36