Input Devices (2)

Input Devices (2)

1. Optical Character Reader

   • A scanner device reads the reflected light from the characters on a page.
   • Scanner creates an image of the character. Software then matches it against a library of similar character shapes

2. Optical Mark Reader

   • Similar to OCR but instead it interprets marks made at specified points on a specially designed form

3. Sensors

   • These read changes in the environment
   • There are a wide range of them. Light, pressure, temperature, humidity and speed

4. Touch Screens

   • Values are associated with different positions on a VDU via a grid of infrared beams across the front of the screen
   • When a user touches a part of the screen the associated value is sent to be processed

5. Speech Input

   • The data is inputted in audio form either directly through a microphone or indirectly through an audio tape
   • Software analyses the inputted sound and matches it against a library of sounds
   • Enter text here