SCANNER

•Group members - Amir hamza khan Bhaves Rathi Sarim Shehzad

•Intructor - Sir Saqib

WHAT IS SCANNER ?

•A scanner is an input device that scans documents such as

photographs and pages of text. When a document is

scanned, it is converted into a digital format. This creates

an electronic version of the document that can be viewed

and edited on a computer.

FLATBED SCANNERS•Most scanners are flatbed devices, which means they

have a flat scanning surface. This is ideal for

photographs, magazines, and various documents.

Most flatbed scanners have a cover that lifts up so

that books and other bulky objects can also be

scanned.

SHEET-FED SCANNERS

•Another type of scanner is a sheet-fed scanner, which

can only accept paper documents. While sheet-fed

scanners cannot scan books, some models include an

automatic document feeder, or ADF, which allows

multiple pages to be scanned in sequence.

HOW DOES A SCANNER WORKS ?

•Scanners work in conjunction with computer software

programs, which import data from the scanner. Most

scanners include basic scanning software that allows the

user to configure, initiate, and import scans. Scanning

plug-ins can also be installed, which allow various

software programs to import scanned images directly.

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•For example, if a scanner plug-in is installed for

Adobe Photoshop, a user can create new images

in Photoshop directly from the connected

scanner.

CONTINUE•While Photoshop can edit scanned images, some programs like

Acrobat and OmniPage can actually recognize scanned text.

This technology is called optical character recognition, or OCR.

Scanning software that includes OCR can turn a scanned text

document into a digital text file that can be opened and edited

by a word processor. Some OCR programs even capture page and

text formatting, making it possible to create electronic copies of

physical documents.

OPTICAL MARK RECONITION

•Reads hand-drawn marks such as small circles or rectangles

•An OMR device scans the documents and matches the

patterns of light

SOME MAJOR MANUFACTURERS OF SCANNERS ARE GIVEN BELOW

Epson, Hewlett-Packard, Microtek,

and Relisys.

BAR CODE READERA barcode reader (or barcode scanner) is an electronic

device for reading printed barcodes. it consists of a

light source, a lens and a light sensor translating

optical impulses into electrical ones. Additionally,

nearly all barcode readers contain decoder circuitry

analyzing the barcode's image data provided by the

sensor and sending the barcode's content to the

scanner's output port.

RFID (RADIO FREQUENCY IDENTIFICATION

Radio-frequency identification (RFID) is the wireless

use of electromagnetic fields to transfer data, for the

purposes of automatically identifying and tracking

tags attached to objects. The tags contain electronically

stored information. Some tags are powered by and read

at short ranges (a few meters) via magnetic fields

(electromagnetic induction)

CONTINUE• Others use a local power source such as a battery, or else have no

battery but collect energy from the interrogating EM field, and then

act as a passive transponder to emit microwaves or UHF (ultra high

frequency) radio waves (i.e., electromagnetic radiation at high

frequencies). Battery powered tags may operate at hundreds of meters.

Unlike a barcode, the tag does not necessarily need to be within line of

sight of the reader, and may be embedded in the tracked object.

MEGNETIC STRIP CARD READERS

• A magnetic stripe card is a type of card capable of storing data by

modifying the magnetism of tiny iron-based magnetic particles on a band of

magnetic material on the card. The magnetic stripe, sometimes called swipe

card or magnet stripe, is read by swiping past a magnetic reading head.

Magnetic stripe cards are commonly used in credit cards, identity cards, and

transportation tickets. They may also contain an RFID tag, a transponder

device and/or a microchip mostly used for business premises access control or

electronic payment.

HERE YOU CAN SEE MAGNETIC STRIP

MAGNETIC INK CHARACTER RECOGNITION

• Magnetic ink character recognition (MICR) is a character-

recognition technology used mainly by the banking industry to

ease the processing and clearance of cheques and other documents.

The MICR encoding, called the MICR line, is at the bottom of

cheques and other vouchers and typically includes the document-

type indicator, bank code, bank account number, cheque number,

cheque amount, and a control indicator. The technology allows

MICR readers to scan and read the information directly into a

data-collection device. Unlike barcodes and similar technologies,

MICR characters can be read easily by humans.

BIOMETIC INPUT

• biometrics is the identification of a person by the measurement

of their biological features. For example, a user identifying

themselves to a computer or building by their finger print or

voice is considered a biometrics identification. When compared

to a password, this type of system is much more difficult to fake

since it is unique to the person. Below is a listing of all known

biometric devices.

• Other common methods of a biometrics scan are a person's face,

hand, iris, and retina.

TERMINAL COMPUTER

• computer terminal, a device that enables a computer to receive or deliver

data. Computer terminals vary greatly depending on the format of the data

they handle. For example, a simple early terminal comprised a typewriter

keyboard for input and a typewriter printing element

for alphanumeric output. A more recent variation includes the keyboard for

input and a television like screen to display the output. The screen can be

a cathode-ray tube or a gas plasma panel, the latter involving an ionized

gas (sandwiched between glass layers) that glows to form dots which, in

turn, connect to form lines. Such displays can present a variety of output,

ranging from simple alphanumerics to complex graphic images used as

design tools by architects and engineers.

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• Portable terminals frequently use liquid crystal displays because of their low

power requirements. The terminals of pen-based computers use a stylus to

input handwriting on the screen. Touch-sensitive terminals accept input

made by touching a pressure-sensitive panel in front of a menu displayed on

the screen. Other familiar types of terminals include store checkout systems

that deliver detailed printed receipts and use laser scanners to read

the barcodes on packages, and automatic teller machines in banks