Computing and the Web

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Computing and the Web

• Multimedia

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Overview

• What is Multimedia
• Manipulating / processing digital images
• Creating Images
• Animation and video
• Audio media Speech
• Audio media Music
• Software Applications

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What is Multimedia ?

• Combination of text, graphics, animation, video,
  and audio
• Inclusion of hypertext
• Capable of end user interaction
• World Wide Web is most illustrative example to
  date

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Manipulating digital images

• Manipulation or processing of images
• Restoration
• Enhancement
• Minor processing
• Minor processing
• Adjust brightness, color, hue
• Enhancement
• False coloring, contrast
• Restoration
• Sharpen image, remove noise

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Example of False Coloring
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Creating Images

• Use of digital capture device
• Camera
• Scanner
• Creation of images from scratch
• Raster graphics (bitmapped)
• Simplest form
• Constructed of individual pixels
• Vector graphics (object oriented)
• Stored as lines, curves, or geometric shapes
• Utilize formulas to draw

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Vector Graphics
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Raster Graphics
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Digital Art
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Captured or Created ?

• Look at the following picture and determine how
  it was created.

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Captured or Created ?

• Created !!
• By hand, or with specialized software?
• Vector or raster graphics?
• What gave it away?
• A look at some others

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Creating Digital Images

• Issues to consider
• Hidden line removal
• Perspective
• Shading / lighting
• Texture

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Forged Digital Images

• Issues to consider
• Media impact
• Internet has limited censorship
• How can you tell?
• What is real
• What was changed
• Digital watermarks

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Forged Digital Images
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Forged Digital Images
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Forged Digital Images
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Forged Digital Images
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Animation and video

• Toy Story
• Monsters Inc.
• Use of animation mixed with real video
• Forrest Gump
• How many presidents did Tom Hanks shake hands
  with?
• Jurassic Park
• Terminator 2
• How many have you seen, but dont realize?

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Animation and video

• Special techniques and effects
• Morphing
• How can you tell if it is real or modified?
• Does it matter?
• Codecs
• COding and DECoding
• MPEG-1, MPEG-2, MP3, AVI, etc
• Streaming media
• Not stored, played as it is received

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Audio media Speech

• Creating speech is very difficult
• Stored words
• Constructed via phonemes
• Unique sound units
• American English has about 42 phonemes
• Speech recognition most difficult of all
• Pitch
• Resonance
• Flow
• Disjointed vs continuous speech

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Audio media Music

• Most common for of audio media
• Music has been digitized and encoded since before
  the CD
• Allows for compression
• No noise from wear
• Variety of formats
• WAV
• MPEG
• MP3
• MIDI musical instrument digital interface

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Software Applications

• Specialized software for
• Creation
• Mixing
• Editing
• Recording
• Ripping