scanner presentation

Group Members :Satnam 25Kabita 26Aishwarya 27

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Copy data from a sourceScanners take paper and convert it into a

bitmap Types of scanners

Optical scanner

Bar code readers

Character and Mark recognition

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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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Flatbed scannerIf 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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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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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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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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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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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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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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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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Scanners read and interpret information on printed matter

The information is converted to a format for storage

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Grades test Checks survey

The sense marks are compared on the test by the scanner

Corrections are calculated

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Scanners capture and digitize printed images. There are several types of scanners:

Flatbed scanners

Handheld scanners

Sheet-fed scanners

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Item to be scanned is to be pulled into a stationary scanning mechanism

Smaller and less expensive than flatbed scanner

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Item to be scanned rotates around stationary scanning mechanism

Very large and expensive Used in the publishing industry.

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Thank You

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