INPUT DEVICES INPUT DEVICES Submitted by: Pradyumna Bhattarai 014BSCIT027.
Input devices
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Transcript of Input devices
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Presented byImtiaz AhmedRabbia Jilani
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Define input Describe keyboard entry, pointing
devices, & scanning devices Discuss image capturing devices,
digitizing devices, & audio input devices
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Define output Describe monitors, printers, and audio
output devices Discuss combination input & output
devices
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Any data or instructions used by a computer
Input devices Hardware
Keyboards Mice Scanners Other devices
Translates data into a form that the system unit can process
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Keyboards Traditional keyboards
Flexible keyboards Ergonomic keyboards Wireless keyboards PDA keyboards
Features Typewriter keyboard with numeric pad Special purpose keys Toggle and combination keys
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Mouse Mechanical Optical Cordless
or wireless Joystick Touch Screen Light Pen
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Optical scanners Flatbed Portable
Bar code readers Handheld wand readers or platform scanners Contain photoelectric cells that read bar codes
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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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Digital camera Images recorded digitally on a disk Images can be downloaded to a computer
Digital video camera Records motion digitally Can take still images as well WebCams
Specialized digital video cameras Broadcast images over the Internet
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Graphics Tablets
Digital Notepads
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Scanner
Light sensing equipment to translate images of text, drawing, photo into digital form
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Types of Scanner
Scanners capture and digitize printed images. There are several types of scanners
Flatbed scannersHandheld scannersSheet-fed scannersDrum scanners
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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
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Handheld scanner
• Any standalone image scanner that either glides from left to right or top to bottom (depending on the scanner model).
• It allows the user to scan the contents of any books, letters, recipes, bank statements, receipts
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Sheet-fed
Item to be scanned is to be pulled into a stationary scanning mechanism
Smaller and less expensive than flatbed scanner
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DRUM SCANNER
Item to be scanned rotates around stationary scanning mechanism
Very large and expensiveUsed in the publishing industry.
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Scanner Devices
Optical scanner
Bar code readers
Character and Mark recognition
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Optical Scanners
Convert text or drawings into machine readable format
Can be displayed, printed, or stored
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Bar Code Readers
Photoelectric (optical) scanners that translate the symbols in the bar code into digital code
Read bar codesAlternating black & white vertical barsUniversal Product Code (UPC)
Seen in grocery stores, retail stores
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Character & Mark Recognition
Magnetic-ink character recognition (MICR)Optical character recognition (OCR)Optical-mark recognition (OMR)
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Magnetic-ink character recognition (MICR)
Reads magnetically encoded characters
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Optical character recognition (OCR)
Software convert scanned text from images (pictures of the text ) to an Editable text format (usually ASCII) that can be imported into a word processing application and manipulated
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Optical character recognition (OCR)
Example Scan or picture capture of the document: a
scanner or a camera capture the paper document.
The OCR engine extract the text from the image
The text recognized is send to be processed
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Optical-mark recognition (OMR)
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