Plan of the lecture

1. Multimedia Technologies

2. Text

3. Images

4. Audio

5. Animation/graphics

6. Multimedia categories

Keywords: Multimedia, graphics, images, sound, audio, animation, video, hypertext

Multimedia is the field concerned with the computer-controlled integration of text, graphics, drawings, still and moving images (Video), animation, audio, and any other mediawhere every type of information can be represented, stored, transmitted and processed digitally.

- Multimedia includes a combination of text, audio, still images, animation, video, and interactivity content forms

- Interactivity =

- A Multimedia Application is an Application which uses a collection of multiple media sources e.g. text, graphics, images, sound/audio, animation and/or video.

TEXT

- When PC’s were in their infancy running under MS-DOS they only displayed text in one size and one color.

- Text on those early PC’s was displayed using the ASCII character set which was a series of 2 numbers that could be sent to the monitor. Each of those two digit numbers represented an alpha-numerical character. For example, the ASCII character code for a lower case a is 97 while the uppercaseis 65.

- A text character was 8 pixels high and 8 pixels wide.

- So when a program sent a character 65 to the screen a helper systems program called ANSI.SYS would send a signal to the proper locftion turning on and off 64 dots appropriately to make an image of the letter A.

- Later with the use of color monitors which had multiple size modes which made it possible to display larger text (still using the ASCII system).

- Windows and other graphical operating systems, used a font (a miniature picture) to paint text on the screen ingraphical mode.

IMAGES

- Turning on or off monitor pixels in graphics mode can create an alpha numerical character. Obviously the same process was used to create a picture in the earlier computers.

- The two shades of gray are added, two shade of blue to the original black and white.

- There are dozens of computer color mixing systems and an endless number of custom palettes.

- All computer colors are creating by mixing RED GREEN and BLUE.

AUDIO

- Reffers to the reproduction and transmission of sound stored in a digital format. The inclades CDs as well as any sound files stored on a computer.

- In contrast, the telephone system (but not ISDN) is based on an analog representation of sound.

- Digital sound can be referred as the sound that is Recorded and stored as a series of numerial values rather than fluctuations in amplitude.

- Every Soundcard comes with an Analog-to-Digital Converter (ADC) for recording.

- And a Digital-to-Analog Converter (DAC) for playing audio.

- The operating system talks to the sound card to actually handle the recording and playback, and Audacity (free software) talks to the operating system so that you can capture sounds to a file, edit them, and mix multiple tracks while playing.

ANIMATION/GRAPHICS

- Animation is sequential series of still images that create an illusion of motion.

- Note the difference between animation and video.

- Whereas video takes continuous motion and breaks it up into discreate frames,

- Animation starts with independent pictures and puts them together to form the illusion of continuous motion.

- 2D animation figures are created and/or edited on the computer using 2D bitmap graphics or created and edited using 2D vector graphics. 3D animation are digitally modeled and manipulated by an animator.

VIDEO

- Unlike an animation that we can create from drawings or images a video is created by a photographic process and converted or ported to a computer in sets of Frames where each frame has data stored in every pixel.

- We measure the rate at which frames are displayed in Frames Per Second (FPS).

- Digital video can be copied with no degradation in quality.

Multimedia categories

Multimedia may be broadly divided into

-Linear and

-Non-linear categories.

- Linear active content progresses without any navigational control for the viewer such as a cinema presentation.

- Non-linear content offers user interactivity to control progress as used with a computer game or used in self-paced computer based training.

Hypertext

-Hypertext is a text which contains links to other texts.

-The term was invented by Ted Nelson around 1965.

Lecture №12.

Subject: Technology Smart

Plan of the lecture

1.Smart education

2.Delicious

3.Interactive whiteboard system and the SMART BoardTM

4.The Smart TV

Keywords: Sites, Interactive,future, education