Spreadsheets Input

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SpreadsheetsInput

• July 22, 2004

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Mechanical Mice

• Trackball
• Horizontal and Vertical Rollers

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LED Mice
Bottom of an optical mouse

• LED Light
• Optical Sensors
• CMOS
• Samples 1500 pictures/second
• DSP (Digital Signal Processor) examines picture
  for patterns, detects amount of movement
• No mouse pad required

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PS/2 Mouse/Keyboard Port

• Pins used for differentfunctions
• Data
• Power
• 1,200 Bps or 40 differentmoves a second

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USB Port

• Used by many different devices, including
  printers, keyboards, and mice.
• Very fast communicationUp to 480 MBps
• Flexible, may be plugged or unplugged while the
  computer runs.

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Alternate Pointing Devices

• Touch Screen
• Used in Museums, public computer screens
• Stylus
• Used with hand held devices
• Used with Computer Aided Drafting (CAD)

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Wireless Keyboards and Mice

• Infrared - IR
• Cheaper, requires line of sight
• Radio
• More expensive, can work around disruptions

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Wireless Keyboards and Mice

• Neighboring computers
• What is the potential problem?
• Solved by using a unique 12-digit code between
  the device and the receiver

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Digital Pictures

• Resolution
• 1200 by 1000
• 50 by 40

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Color Depth

• 8 bits 256 different colors
• 24 bits about 16,000,000 colors

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Picture File Types

• Bit Map (BMP)
• Standard for Windows
• Inefficient use of space
• JPEG Internet Photos
• GIF Animations

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Picture Compression

• Different techniques used for pictures and movies
  (Quicktime and Real Player)

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Digital Camera

• Store images
• Transfer images via USB or Firewire
• Wide range of prices (from 100 to 4,000)
• 100 to 500 are sufficient for most people
• CCD receives the image information

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Digital Camera Function

• Light hits Diode, increasing energy on an
  electron, enabling will be used to generate an
  image.

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Digital Camera Comparison

• 2 Mega-Pixel
• Photo Album
• 5 Mega-Pixel
• Framed Prints

4 x 6
8 x 10
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OCR and OMR

• Optical Character Recognition
• Read characters and formatting from a document
• Optical Mark Recognition
• Scantron tests
• Bar Codes
• Universal Product Codes

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Web Cameras

• Provide live views
• http//www.tripcheck.com/RoadCams/roadcams.htm
• http//www.earthcam.com/