Image Scanner

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Image Scanner
Computer Studies Project - I/O Devices

• 4A Hui Yuen Fai
• 2040158(22)

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What is a scanner?

• It is an input device.
• A scanner is like a copier, except that instead
  of making the copy onto paper, it creates a
  computer image file of the scanned image. Once
  the image is in this digital form, you can store
  it on your computer hard disk, manipulate it with
  a graphics design program, add it to your poster
  design, and more.

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What is a scanner?

• Once the image is scanned, some kind of software
  is needed to convert the digital code to a
  viewable image. Most scanners come with basic
  software. There are many brands of imaging
  software available on the market.

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Types of scanner

• Flatbed scanners, also called desktop scanners,
  are the most versatile and commonly used
  scanners.
• Sheet-fed scanners are similar to flatbed
  scanners except the document is moved and the
  scan head is immobile. A sheet-fed scanner looks
  a lot like a small portable printer.

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Types of scanner

• Handheld scanners use the same basic technology
  as a flatbed scanner, but rely on the user to
  move them instead of a motorized belt. This type
  of scanner typically does not provide good image
  quality. However, it can be useful for quickly
  capturing text.
• Drum scanners are used by the publishing industry
  to capture incredibly detailed images.

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Objectives of scanner

• To reduce the time spent on data input.
• To capture pictures ,photo ,drawing or graphics
  directly.
• To save images for future use.

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Applications

• Image editing
• OCR
• Document management
• Forms conversion
• Utilities

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Scanning method (for flatbed scanners)

• Place pictures on the scanner glass
• Start scanner software
• Select the area to be scanned
• Choose the image types
• Sharp the images
• Set the images size
• Save the scanned images