The document discusses different types of scanners and how they work. It describes flatbed scanners, portable scanners, and sheetfed scanners. It also covers optical scanners, bar code readers, MICR, OCR, and OMR. Uses of scanners include copying documents, transmitting faxes, including images in documents, and analyzing text and images through character recognition.

1. Group Members :
Satnam 25
Kabita 26
Aishwarya 27
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2.  Copy data from a source
Scanners take paper and convert it into a bitmap
 Types of scanners
 Optical scanner
 Bar code readers
 Character and Mark recognition
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3.  Convert text or drawings into machine
readable format
 Can be displayed, printed, or stored
 Types of optical scanners
 Flatbed scanner
 Source placed on glass surface
 Image scanned from below
 Portable scanner
 Handheld device that slides across source
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4. Flatbed scanner
If we talk about scanners, thus we mean usually flatbed scanner.
The scan documents (texts, photo, diagrams etc..) are put on a
glass plate like a copier, under which a carriage with an exposure
item and the read head moves. Then the picture is scanned The
picture information is entered by a CCD (Charge Couple
Device). CCDs are semiconductor chips, with an array of photo-
sensitive cells, which are used for the transformation from
electromagnetic waves of light into electrical signals.
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5.  Photoelectric scanner
 Using Optical Recognition, a light beam scans the item and
changes it into electrical impulses for processing Contain
photoelectric cells that read bar codes
 Read bar codes
 Alternating black & white vertical bars
 Universal Product Code (UPC)
 Seen in grocery stores, retail stores
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6.  Magnetic-ink character recognition (MICR)
 Reads magnetically encoded characters
 Optical-character recognition (OCR)
 Optical character recognition (OCR) converts
bitmap back into text
 • different fonts create problems for simple
“template matching”
algorithms
 • more complex systems segment text,
decompose it into lines and arcs, and decipher
characters that way
 Optical-mark recognition (OMR)
 Senses presence or absence of marks
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7.  A flatbed scanner scans one sheet at a time by laying
the sheet face down on the bed of the scanner
 Sheetfed scanner use motorized rollers to feed the
document across the scanning mechanism
 Handheld scanner-portable device that requires users
to pass the scanning element over the item to be
scanned
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8.  Bar codes-each product has a unique product
code (UPC) represented by a pattern of bars
 Bar code scanner scans the bars using
reflected light which is then processed to
retrieve product information assigned to that
bar code
 Handwriting Recognition
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9.  Scanners are typically envisioned as connected to a co-
located host computer.
 Submitting “Jobs” to network scanners is unnatural
since a walk-up user must be present to submit the
originals anyway.
 Jobs may be most naturally started at the scanner and
not at a workstation.
 Will be more prevalent as networked MFPs provide
scanning capability.
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10.  Archive-Communicate
 recording a facsimile of an image, such as a form or a
signature for storage, transmission or reproduction.
Parameters and area probably well defined, fidelity important.
Includes Copying, Fax.
 Modify-Reproduce
 Capturing an image for inclusion in a document or display,
often with modification, scaling, cropping, etc. Parameters
may not be known and area to be scanned may be
inconsistent, fidelity important.
 Extract-Analysis
 Processing an image for analysis or interpretation, such as
OCR or feature analysis. Parameters and area probably well
defined, fidelity not too important for extraction. Analysis
required very high fidelity.
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11.  Character and mark recognition devices
 Scanners that recognize special characters &
marks
 Magnetic ink character recognition (MICR)
 Optical-character recognition (OCR)
 Optical-mark recognition (OMR)
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12.  Scanners read and
interpret information
on printed matter
 The information is
converted to a format
for storage
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13.  Grades test
 Checks survey
 The sense marks are
compared on the test by
the scanner
 Corrections are
calculated
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14.  Scanners capture and digitize printed images.
There are several types of scanners:
 Flatbed scanners
 Handheld scanners
 Sheet-fed scanners
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15.  Item to be scanned is to be pulled into a
stationary scanning mechanism
 Smaller and less expensive than flatbed
scanner
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16.  Item to be scanned rotates around stationary
scanning mechanism
 Very large and expensive
 Used in the publishing industry.
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17. Thank You
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