Document Scanners - PowerPoint PPT Presentation

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Document Scanners

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Document Scanners. Going Digital. online articles. pictures / photos. A flow of ideas ... Resolution measured in dots per inch. flatbed scanners have 300 to 600 ... – PowerPoint PPT presentation

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Title: Document Scanners


1
Document Scanners
  • Going Digital
  • online articles
  • pictures / photos
  • A flow of ideas

2
Parts
  • Light Source
  • fluorescent lamp
  • Xenon gas lamp
  • LEDs
  • Lens
  • Mirror
  • Detector / Sensor
  • CCD
  • photomultiplier
  • CIS

3
  • Flatbed Scanner
  • Handheld Scanner
  • Sheet-fed Scanner
  • Drum scanner

4
The Image
  • Resolution measured in dots per inch
  • flatbed scanners have 300 to 600 dpi
  • Interpolation
  • Flatbed scanners can have 2400 to 9600 dpi
  • MoirĂ© pattern removal
  • 2 repetitive patterns overlap
  • Scanning dots with dots
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