Scanner PPT

8/3/2019 Scanner PPT

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IntroductionIntroduction

Scanners have become an important part of theScanners have become an important part of thehome office over the last few years.home office over the last few years.

A scanner is the eye of a computer that allowsA scanner is the eye of a computer that allowsyou toyou to capture informationcapture information likelike pictures and text.pictures and text.

After capturing itAfter capturing it convert it into a digital formatconvert it into a digital formatthat can be edited on your computerthat can be edited on your computer


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Type of scannerType of scanner

Flatbed ScannerFlatbed Scanner SheetSheet--fed scannersfed scanners

Combo scanner/printer/faxCombo scanner/printer/fax Handheld scannersHandheld scanners


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Flatbed ScannerFlatbed Scanner

Most popular type ofMost popular type ofscanner for home use isscanner for home use is

the flatbed, or desktop,the flatbed, or desktop,scanner.scanner.

It makes it easy to scanIt makes it easy to scanpapers, books and anypapers, books and anyother item that you canother item that you canflat between a glass bedflat between a glass bed(plate) and the(plate) and thescanner's top cover.scanner's top cover.


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SheetSheet--fed scannersfed scanners

Similar to flatbedSimilar to flatbedscanners except thescanners except the

document is moveddocument is movedand theand the scan headscan headis immobile.is immobile.

A sheetA sheet--fed scannerfed scanner

looks a lot like alooks a lot like asmall portablesmall portableprinterprinter..


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Combo scanner/printer/faxCombo scanner/printer/fax

Popular option in homePopular option in homeoffices and small officesoffices and small officesis the "allis the "all--inin--one"one"

machine that scans,machine that scans,prints, faxes, and copiesprints, faxes, and copiespopularized by Hewlettpopularized by Hewlett--PackardPackard, effectively, effectivelymerge a blackmerge a black--andand--

white sheetwhite sheet--fed scannerfed scannerwith an inkjet or laserwith an inkjet or laserprinter and a faxprinter and a faxmachine.machine.


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Handheld scannersHandheld scanners

Use the same basicUse the same basictechnology as a flatbedtechnology as a flatbedscannerscanner

Rely on the user toRely on the user to

move them instead ofmove them instead ofa motorized belt.a motorized belt. This type of scannerThis type of scanner

typically does nottypically does notprovide good imageprovide good image

quality.quality. It can be useful forIt can be useful for

quickly capturing text.quickly capturing text.


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Scanner/Computer InterfaceScanner/Computer Interface

There are three main interfaces used toThere are three main interfaces used toconnect scanners to personal computers:connect scanners to personal computers:

-- USBUSB

-- ParallelParallel

-- SCSISCSI


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Image QualityImage Quality

Scanners vary in resolution and sharpness.Scanners vary in resolution and sharpness. Most flatbed scanners have a true hardwareMost flatbed scanners have a true hardware

resolution of at least 300x300 dots per inchresolution of at least 300x300 dots per inch(dpi).(dpi).

The scanner's dpi is determined by the numberThe scanner's dpi is determined by the numberof sensors in a single row (xof sensors in a single row (x--direction samplingdirection sampling

rate) of the CCD or CIS array by the precision ofrate) of the CCD or CIS array by the precision ofthe stepper motor (ythe stepper motor (y--direction sampling rate).direction sampling rate).

Resolution can be artificially enhanced by theResolution can be artificially enhanced by thescanning software used by scanner.scanning software used by scanner.


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Optical Character RecognitionOptical Character Recognition

Many scanners also include optical characterMany scanners also include optical characterrecognition (OCR) software used for separaterecognition (OCR) software used for separate

divide text vs , which enables you to convertdivide text vs , which enables you to convertscanned text into computerscanned text into computer--based text.based text.

It uses an averaging process to determineIt uses an averaging process to determine whatwhatthe shape of a characterthe shape of a character is and match it to theis and match it to the

correct letter or numbercorrect letter or number..


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Connecting a Scanner to PCConnecting a Scanner to PC

Unlock the scannerUnlock the scanner i.e. carriage lock thati.e. carriage lock thatprotects the internal components from damageprotects the internal components from damageduring shipment.during shipment.

DisconnectDisconnect the end of thethe end of the printer cable(50 pin)printer cable(50 pin)to the back of the scanner.to the back of the scanner.

ConnectConnect the scanner cable to thethe scanner cable to the parallel portparallel port onon

thethe computer.computer. ConnectConnect thethe other end of the scanner cableother end of the scanner cable totothe back of the scanner.the back of the scanner.

Scanner PPT

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