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Scanner
                  A  scanner  is  a  device  that  scans  a  document  by  sensing  the  reflection  that  is
                  received when the scanner emits rays on the content. It takes the image of content
                  and converts it into a digital file.

                  The scanned images or photos can be stored in a computer and can be easily
                  transferred to a secondary storage device. Scanners can be categorised as Hand
                  held scanner and Flatbed scanner.

                                                  Optical Mark Reader (OMR)
                                                  OMR is an input device that can detect the marks on a paper. It is used
                                                  to evaluate answer sheets in which selected answers are marked in dark
                                                  circles.

                                                  It is used to read or detect marked answers by sensing the marks made
                                                  on the answer sheet by exposing the sheet to a beam of light.


                  Magnetic Ink Character Reader (MICR)
                  MICR is a device which is used by banks for processing cheques by interpreting
                  information stored in MICR code (printed at the bottom of cheque)

                  On the cheques, the code of name of the bank,  branch  code and  cheque
                  number are printed with a special kind of ink containing magnetic particles or
                  iron oxide which is scanned and read with the help of MICR and accordingly
                  processed in the computer. A MICR code consists of nine (9) digits.



                       Do you know?

                       A magnetic stripe has the holding capacity of about 1024 bits of information.



                                                   Light Pen
                                                   A Light Pen is a pen-like device that uses a light-sensitive detector to
                                                   select or draw objects on the display screen.

                                                   It is similar to a mouse, except that with a light pen one can move the
                                                   pointer on the screen by touching it to the objects on the screen. When
                                                   the pen is moved across the screen, its position is sensed because of
                                                   the light it emits.

                  Barcode Reader

                  A Barcode reader is a popular scanning device that reads the bar codes. Barcode
                  comprises of adjacent  vertical black bars of different  widths. A barcode  stores
                  information about a product, e.g., its price, weight, manufacturing details etc.







                   16    Touchpad Computer Applications (Ver. 2.0)-IX
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