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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

