Aqsa Bibi
SP11/BBA/013
Huma Rehman
SP11/BBA/038
Ch Ateeq Ullah Zafar
SP11/BBA/020
Danial Ahmed
SP11/BBA/021
Fareeha Khalid
SP11/BBA/031
• It is a device that optically scans images,printed
text,hand wrighting or an object and converts it to
a digital image.
Types of Scanner:
1.
2.
3.
4.
Flatbed scanner
Sheetfed Scanner
Pen scanner
Drum scanner
Flatbed scanner:
•
•
•
•
It is also called desktop scanners.
They are versatile.
Commonly used scanners.
In fact this article will focus on the technology as it
realates to flatbed scanners.
• Flatbed scanners are dominating the market now .
• The flatbed can scan pages while still attached in
the book or magzine.
• It can scan portions of documents larger than the
scanner bed(like maps)
Sheetfed Scanner:
• Sheetfed are similar to
flatbed scanners except the
document is moved by the scan
head is immobile.
• A sheetfed scanner looks a lot like a small portale
printer.
Pen scanner:
• It is used as the same way
you use a marker highlighter.
• Simply take the pen scanner across the text.
• The pen scanner will let you scan,store and transfer
your printed text as well as smaller images to your
computer.its ideal for taking notes or scanning text
for students that use a text reader.
Drum Scanner:
• It is used by the publishing
Industry to capture incredibly
detailed images.
• They use a technology called (PMT) photomultiplier
tube.
• In PMT,the document to be scanned is mounted on
a glass cylinder.At the center of the cylinder is a
sensor that splits light bounced from the document
into three beams.each beam is sent through a
colour filter into a photomultiplier tube where the
light is changed in to an electrical signal.
1. Barcode Readers
2. RFID Readers
Barcode Reader:
•
A barcode reader
(or bar code scanner)is an
Electronic device for reading printed
barcodes.
How Barcode Reader works?
• A typical Bar Code Reader consists of Scanner,
Decoder, and Cable.
• The Scanner scans the Bar Code symbol and
captures the bars and spaces of the bar code
and sends it to the decoder.
• The decoder translates the bars and spaces
into corresponding electrical output and
transmits that data to the computer in a
traditional data format.
Types Of Barcode Readers
1. Pen wand
2. Slot scanner
3. CCD Barcode scanner
4. Laser Scanner
Pen Wand:
• The simplest barcode reader. It contains no moving
parts and is known for its durability and low cost.
• User has to remain in direct contact with the bar
code
• It must be held at a certain angle and has to be
moved over the bar code at a certain speed.
Slot Scanner:
• A slot scanner remains stationary and the item
with the bar code on it is pulled by hand through
the slot.
• Slot scanners are typically used to scan bar codes
on identification cards.
• Time and attendance, factory data collection and
access control are a few of the applications for a
slot scanner in the workplace.
CCD Barcode Scanner
• CCD stands for (charge couple device)
• A CCD scanner has a better read-range than the
pen wand.
• It is used in retail sales.
• Typically, a CCD scanner has a "gun" type interface
and has to be held no more than one inch from the
bar code.
CCD Barcode Scanner
• Several readings are taken to reduce the
possibility of errors.
• A disadvantage of the CCD scanner is that it
cannot read a bar code that is wider than its input
face.
Laser Scanner:
• A laser scanner, either hand-held or stationary,
does not have to be close to the bar code in order
to do its job.
• It uses a system of mirrors and lenses to allow the
scanner to read the bar code regardless of
orientation, and can easily read a bar code up to
24 inches away.
Laser Scanner:
• To reduce the possibility of errors, A laser scanning
may perform up to 500 scans per second.
• They are capable of reading a bar code up to 30 feet
away.
RFID(Radio Frequency Identification):
RFID is a technology that uses communication via
radio waves to exchange data between a reader and
an electronic tag attached to an object,for the
purpose of identification and tracking.
RFID(Radio Frequency Identification):
• RFID Makes it possible to give each product in a grocery
store its own unique identifying number, to provide
assets,people,Work in process,Medical devices etc.
•All with unique identifiers like the license plate on a car but
for every item in the world.
•Radio –frequency identification involves hardware known as
interrogators(also known as readers), and tags(also known as
labels),as well as RFID software.
MOST RFID Tags Contains atleast two
parts:
• One is an integrated circuit for storing and
processing data, modulating and demodulating a
radio frequency .
•The other is an antenna for receiving and
transmitting the signal
Types of RFID depending on
mobility
1. Fixed RFID
2. Mobile RFID
FIXED RFID
•If the reader reads tags in a stationary position,it is called
fixed RFID
•These fixed readers are set up specific interrogation
zones and create a BUBBLE of RF(radio frequency)
energy.
•This allows a very difinitive reading area for when tags go
in and out of interrogation zones.
Mobile RFID
• If the reader is mobile when the reader reads tag,it
is called mobile RFID.
• Mobile readers include handhelds, carts and vehicle
mounted RFID readers from manufacturer such as
Motorola,sirit etc
TYPES OF RFID TAGS
1. Passive RFID tags
2. Active RFID tags
3. (BAP) RFID tags
Passive RFID tags
• Which have no power source and require an
external electromagnetic field to initiate a signal
transmission.
Active RFID tags
• Which contains a battery and can transmit signals
once an external source(interrogator)has been
successfully identified.
(BAP) RFID TAGS
• Which require an external sourace to wake up
but have significant higher forward link capability
providing greater range.