Scanners

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Scanners
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Scanners

• Convert paper (or film) into digital image.
• Scans one line (raster) at a time
• With Optical Character Recognition software
  document images can be converted into (formatted)
  text .

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Types of Scanners

• Flatbed
• Paper laid flat on a glass sheet
• Scanner moves across the sheet
• Sheet-fed
• Paper placed in paper-feed tray
• Paper moves across the scanner
• Handheld
• You run the scanner across a flat still sheet
• Pretty rare we are not as good as steppermotors

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Scanner Images
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Scanner Components

• Glass Plate
• Scanning Head
• Stepper Motor
• Control/Interface Circuits

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Scanning Head

• Contains
• Lights and Mirrors
• Bright FL,CFL,Xenon illuminates image
• Mirrors reflect light to Sensor
• Stabilizer Bar
• Rigid Bar for Scanning head to ride on
• Image Sensor
• Converts light into electricity
• Determince Maximum Scanning Resolution
• Charged Coupled Device (CCD)
• Contact Image Sensor (CIS)

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Stepper Motor

• Synchronous electric motor that breaks up a
  rotation into many steps.
• Uses gearing to move the scan head one line
  (raster) at a time.
• Attaches directly to scan head or uses a belt.

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