Multimedia

What is Multimedia?
 

*Multimedia has become interactive


•Interactive multimedia: The use of media such as text, graphics, animation, video, and audio in an interactive way that allows a participant to control it.
•To understand the value of interactive multimedia, we will examine visual and audio concepts in detail.



Visual Media:
Manipulating Images


*Previously created images (Modifying or processing images that already exist)
•Three types of techniques used to manipulate images:
–Minor Processing Techniques
–Enhancement
–Restoration
 
*Common example of digitized images: Satellite weather maps.
•GEOS-7 satellite picture taken on Aug. 24, 1992.
•Outlines created by  a computer program.
•Program color coded the picture to give information about the hurricane’s wind speed.
*Landsat 4 Satellite:
•Uses 3 of the 7 frequencies available from the Thematic Mapper of the satellite.
•Like having a camera with different filters, each letting a different frequency through (including infrared).


 
*Image enhancement
•A type of digital image processing whose goal is to highlight or enhance particular aspects of an image or change an image’s structure.
•Common example of image enhancement:  False-coloring: An image enhancement technique that consists of changing the colors of an image or assigning colors to various parts of an image.
*Image restoration
A type of digital image processing whose goal is to eliminate known, but unwanted image flaws or degradations

Visual Media:
Animation and Video


*Animation:
•Early animation started with pictures flipping hand-cranked players.
•Animation 30 years ago:
–Cartoons had to have the figures drawn by artists.
–The animator would make them move while taking pictures, frame by frame.
•Animation now:
–Computers are used to create full length feature cartoons.
•Toy Story
•Individual frames stored on the computer.
•Special player programs can be used to view them on the computer screen or recorded on videotape using special hardware and software.
  
Audio Media:
Human Speech


*The importance of vocal communication:
•It is the fastest method of communication.
•Most communication is vocal.
•Researchers believe that human intelligence is closely linked to the development of vocal communication and language.
  

*Creating Speech:  Recorded Speech
•Recording and digitizing  individual words and phrases.
–Common uses:
•Talking cash registers.
•Automated national telephone information service.
–Problems with recorded speech:
•Creating whole sentences of human speech would take a huge amount of computer memory.
•Several versions of each word would need to be digitized to account for pitch and volume levels (for punctuation and variations of the same word).

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