F451- Input Devices

Detailed descriptions of different input devices including; OMR, OCR, MICR etc.

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OCR

Optical Character Recognition:

  • Shapes of individual characters are scanned and recorded optically 
  • Shapes are compared to a library of possible characters

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Uses:

  • Software can turn input into audible output for the blind

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Disadvantage:

  • Unreliable form of input-­only effective when having to recognise a standard (printed) character set rather than hand-­writing
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OMR

Optical Mark Recognition:

  • Marks are positioned in specified locations
  • Reader identifies location of mark
  • Location of the mark equates to a value

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Uses:

  • To mark multiple choice exams

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Advantage:

  • Marking is a lot faster and more accurate
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MICR

Magnetic Ink Character Recognition:

  • Special characters are printed on a document in magnetisable ink
  • Can be read by humans and computers alike

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Uses:

  • Account numbers on cheques

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Advantage:

  • Magnetised ink means characters are more likely to be read accurately
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Sensors

  • Input device that detects physical quantities
  • This includes heat, light, sound and movement
  • Quantities are converted into electrical signals

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Uses:

  • Measuring temperature
  • Measuring humidity
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Touch Screens

  • Input achieved by pressing on the screen
  • Used when there are a finite number of possible choices
  • User is restricted to what is available on the screen

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Uses:

  • ATM Machine (cash machine)
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