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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
categorized as ‘Hand held scanner’ and ‘Flatbed scanner’.
Optical Mark Reader (OMR)
OMR is an input device which 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 & 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 which 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.
Bar Code Reader
A Bar Code Reader is a popular scanning device which reads the bar codes. Bar
code comprises of adjacent vertical black bars of different width. A barcode stores
information about a product, eg: its price, weight, manufacturing details etc.
16 Touchpad Computer Applications-IX

