Scanner presentation

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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