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Computer Studies Project - I/O Devices. Image Scanner. 4A Hui Yuen Fai 2040158(22). What is a scanner?. It is an input device.

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Presentation Transcript
what is a scanner
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.
what is a scanner3
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.
types of scanner
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.
types of scanner5
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.
objectives of scanner
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.
applications
Applications
  • Image editing
  • OCR
  • Document management
  • Forms conversion
  • Utilities
scanning method for flatbed scanners
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
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