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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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Image scanner l.jpg

Computer Studies Project - I/O Devices

Image Scanner

4A Hui Yuen Fai

2040158(22)


What is a scanner l.jpg
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


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