INTRODUCTION TO MULTIMEDIA. Chapter 2 Multimedia Systems

Transcription

1 INTRODUCTION TO MULTIMEDIA Chapter 2 s

2 Definition of Multimedia System A is a system capable of processing multimedia data and applications.

3 Characteristics of a s A Multimedia systems has four basic characteristics: 1. Multimedia systems must be computer controlled. 2. Multimedia systems are integrated. 3. The information they handle must be represented digitally. 4. The interface to the final presentation of media is usually interactive

4 Characteristics of a s 1. Computer Controlled Producing the content of the information e.g. by using the authoring tools, image editor, sound and video editor Storing the information providing large and shared capacity for multimedia information. Transmitting the information through the network. Presenting the information to the end user make direct use of computer peripheral such as display device (monitor) or sound generator (speaker).

5 Characteristics of a s 2. Integrated All multimedia components (audio, video, text, graphics) used in the system must be somehow integrated. Every device, such as microphone and camera is connected to and controlled by a single computer. A single type of digital storage is used for all media type. Video sequences are shown on computer screen instead of TV monitor.

6 Characteristics of a s 3. Interactivity Level 1: Interactivity strictly on information delivery. Users select the time at which the presentation starts, the order, the speed and the form of the presentation itself. Level 2: Users can modify or enrich the content of the information, and this modification is recorded. Level 3: Actual processing of users input and the computer generate genuine result based on the users input.

7 Characteristics of a s 4. Digitally Represented Digitization: process involved in transforming an analog signal to digital signal.

8 Quiz!!! 1. Define MULTIMEDIA SYSTEM. 2. What are the four characteristics of MULTIMEDIA SYSTEM?

9 Challenges 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 on play back/retrieval. What process are involved in the above.

10 Desirable Features for a Very High Processing Power Multimedia Capable File System Data Representations/File Formats that support multimedia Efficient and High I/O Special Operating System Storage and Memory Network Support Software Tools

11 Components of a Capture Devices Display Devices Component of Multimedia System Storage Devices Computer System Communication Network

12 Components of a Central Processing Unit A central processing unit (CPU), or sometimes simply processor, is the component in a digital computer capable of executing a program.

13 Components of a Monitor A monitor, is a piece of electrical equipment which displays viewable images generated by a computer without producing a permanent record.

14 Components of a Projector Projection devices such as data projectors can be used to display images on surfaces such as a wall, producing clear, bright and high resolution images.

15 Components of a Video Grabbing Card A video card, (also referred to as a graphics accelerator card, display adapter, graphics card, and numerous other terms), is an item of personal computer hardware whose function is to generate and output images to a display.

16 Components of a Sound Card A sound card (also known as an audio card) is a computer expansion card that facilitates the input and output sound under control of computer programs.

17 Components of a Speakers A loudspeaker, speaker, or speaker system is an electromechanical transducer which converts an electrical signal into sound.

18 Components of a CD-ROM Drive CD-ROM discs are read using CD-ROM drives, which are now almost universal on personal computers.

19 Components of a Scanner A scanner is a device that analyzes images, printed text, or handwriting, or an object (such as an ornament) and converts it to a digital image.

20 Components of a Touchscreen Touchscreens, touch screens, touch panels or touchscreen panels are display overlays which have the ability to display and receive information on the same screen.

21 Components of a Head-up Display Devices that are worn on the head to display information are known as head-up displays. This technology has been implemented in virtual reality.

22 Quiz!!! 1. What are the components of Multimedia System and give examples for each.