Introduction CENG 460 By: Roya Choupani 2/26/2010 1

Transcription

1 Introduction 1

2 Media and Multimedia Motivation and Applications Multimedia Data Representation 2

3 Definitions: Data: is information that may be valuable for an end-user Media: tools used to store and deliver information or data Multimedia: communications that include multiple forms of information 3

4 Text Image Graphics Animation Audio Video 4

5 Any form of written material 5

6 Images are two-dimensional data seen by people, such as a photograph, and screen display. They may be captured by optical devices such as cameras. 6

7 Graphics are visual presentations on some surface, such as a wall, canvas, computer screen, paper, etc. 7

8 Animation is the rapid display of a sequence of 2-D images to create an illusion of movement 8

9 Audio is sound within the hearing range of humans. Audio frequency should be within the range of 20 to 20,000 hertz. 9

10 Video is the technology that captures moving images electronically. Those moving images are in fact a series of still images that change so fast that it looks like the image is moving. 10

11 Point of Sale Point of Information Training Learning Entertainment 11

12 Using multimedia data, the user is presented the various models available from the vendor This can be a graphical demonstration of how 2009 TOYOTA LANDCRUISER UZJ200R SAHARA (4X4) the product actually works. Price: $91,990 Kilometers: Body: Color: Transmission: Engine Size: Wagon Pearl White Automatic 4.7 Litres No of Seats: 8 Fuel Type: Petrol - Unlead Extras/Features: 17 Inch Alloy Wheels Air Con + Climate Control Multi Zone Alarm System/Remote Anti Theft Anti- Lock Braking Brake Assist CD With 6 CD Stacker Central 12

13 Interactive multimedia information systems are being used in museums, hotels, university campuses, companies, etc. 13

14 Visual training with the help of images, animation, video and other type of multimedia is proven to be more effective. Multiple choice exams after short video clips can lead the user through the training system. 14

15 A successful learning system should have features for the user to explore the information. 15

16 Entertainment is one of the important areas for multimedia applications. Computer games are becoming widespread by simulating the real game environments. 16

17 Multimedia data is used from a distance using computer networks. The Internet is a public network that can be used for multimedia transmission. 17

18 The Internet is a large network interconnecting local networks. The Internet has a heterogeneous structure. The Internet is a best-effort network. The Internet does not guarantee a fixed data rate over a connection. Multimedia data should adapt itself with network data rate changes. 18

19 Multimedia data can be used as: Streaming data Data (audio, video, etc) is presented to the end-user only once (without being saved to a file). Downloadable Data is downloaded to a file and presented to the enduser repeatedly. 19

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24 A sample video contains: About 30 frames per second About 600 x 800 rows and columns in each frame Needs 3 bytes for each pixel The file size for a one hour video will be 3600 * 30 * 600 * 800 * 3 = 155,520,000,000 Bytes which is about the size of 220 CDs Conclusion: Multimedia data should be stored in compressed form. 24

25 Multimedia is a way of presenting information to the end-user in multiple formats (audio, visual, etc. ) Multimedia provides possibility of transferring information from a distance (using computer networks) Large size of multimedia data requires high rate of compression. 25

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