Scanner presentation

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    20-Jan-2015
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Transcript of Scanner presentation

  • 1. Group Members :Satnam 25Kabita 26Aishwarya 271

2. 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 2 3. Convert text or drawings into machinereadable 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 3 4. Flatbed scannerIf we talk about scanners, thus we mean usually flatbed scanner.The scan documents (texts, photo, diagrams etc..) are put on aglass plate like a copier, under which a carriage with an exposureitem and the read head moves. Then the picture is scanned Thepicture information is entered by a CCD (Charge CoupleDevice). CCDs are semiconductor chips, with an array of photo-sensitive cells, which are used for the transformation fromelectromagnetic waves of light into electrical signals. 4 5. Photoelectric scanner Using Optical Recognition, a light beam scans the item andchanges it into electrical impulses for processing Containphotoelectric cells that read bar codes Read bar codes Alternating black & white vertical bars Universal Product Code (UPC) Seen in grocery stores, retail stores 5 6. Magnetic-ink character recognition (MICR) Reads magnetically encoded characters Optical-character recognition (OCR) Optical character recognition (OCR) convertsbitmap back into text different fonts create problems for simpletemplate matchingalgorithms more complex systems segment text,decompose it into lines and arcs, and deciphercharacters that way Optical-mark recognition (OMR) Senses presence or absence of marks 6 7. A flatbed scanner scans one sheet at a time by layingthe sheet face down on the bed of the scanner Sheetfed scanner use motorized rollers to feed thedocument across the scanning mechanism Handheld scanner-portable device that requires usersto pass the scanning element over the item to bescanned7 8. Bar codes-each product has a unique productcode (UPC) represented by a pattern of bars Bar code scanner scans the bars usingreflected light which is then processed toretrieve product information assigned to thatbar code Handwriting Recognition8 9. Scanners are typically envisioned as connected to a co-located host computer. Submitting Jobs to network scanners is unnaturalsince a walk-up user must be present to submit theoriginals anyway. Jobs may be most naturally started at the scanner andnot at a workstation. Will be more prevalent as networked MFPs providescanning capability.9 10. Archive-Communicate recording a facsimile of an image, such as a form or asignature 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. Parametersmay not be known and area to be scanned may beinconsistent, fidelity important. Extract-Analysis Processing an image for analysis or interpretation, such asOCR or feature analysis. Parameters and area probably welldefined, fidelity not too important for extraction. Analysisrequired very high fidelity. 10 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)11 12. Scanners read andinterpret informationon printed matter The information isconverted to a formatfor storage12 13. Grades test Checks survey The sense marks arecompared on the test bythe scanner Corrections arecalculated13 14. Scanners capture and digitize printed images.There are several types of scanners: Flatbed scanners Handheld scanners Sheet-fed scanners14 15. Item to be scanned is to be pulled into astationary scanning mechanism Smaller and less expensive than flatbedscanner15 16. Item to be scanned rotates around stationaryscanning mechanism Very large and expensive Used in the publishing industry. 16 17. Thank You17