This topic is taken from Right Byte-1, Unit #2 - Input devices, prepared by Samina Ahmed, FIC Malir.

2. Talk of the Day

3. Input Devices
Unit 2
Prepared by Ms. Samina Ahmed

4. The Digitizing
and
scanning Devices

5. The Digitizing
Devices
Digitizing devices convert manually
produce data in a digital form which
can be stores and manipulated on a
computer.

6. Graphic Tablet
• A graphic tablet is a board, covered
by a touch sensitive membrane.
• A stylus is a pointer while a puck is a
mouse like device.
• The stylus and puck are used to draw
directly on tablet.

7. The Scanning Devices
Scanning devices can convert and store
large amount of data in the form of
images when they run across the surface
of data.

8. The optical Scanner :
An optical scanner converts printed and
hand written text, diagrams and pictures
into digital form and send it to the
computer directly.
The digital image can be displayed,
edited, printed and stored for later use.
Types of scanner :
• Flat-bed scanner
• Portable scanner

9. Flat-bed scanner:

10. Portable or hand-held scanner:

11. The Card Reader:
The card reader reads a magnetic strip on a plastic card.
This magnetic strips hold information and allow computer to identify
the owner of card.
• Smart Card
• Laser Card

12. Quick Response (Q.R) Code Reader:
A QR code (short for "quick
response" code) is a type of barcode that
contains a matrix of dots. It can be
scanned using a QR scanner or a
smartphone with built-in camera. Once
scanned, software on the device converts
the dots within the code into numbers or a
string of characters.
You may soon see QR Codes in a magazine
advert, on a billboard, a web page or even
on someone’s t-shirt.

13. What is Bar Code?
A barcode or bar code is a method of
representing data in a visual, machine-
readable form. Initially, barcodes
represented data by varying the widths and
spacings of parallel lines.

14. The Bar code Reader:
• A barcode reader (or barcode scanner)
is an optical scanner that can read
printed barcodes, decode the data
contained in the barcode and send the
data to a computer. Like a
flatbed scanner, it consists of a light
source, a lens and a light sensor
translating for optical impulses into
electrical signals.

15. The Finger Print Reader:
The finger print reader is used to identify
people. It uses the stored images of finger
prints.
The scanner uses a light-sensitive
microchip is used to produce a digital
image. Then computer analyses the image
and identify the people.