input devices
DESCRIPTION
Information TechnologyTRANSCRIPT
Presented byImtiaz AhmedRabbia Jilani
Define input Describe keyboard entry, pointing
devices, & scanning devices Discuss image capturing devices,
digitizing devices, & audio input devices
Define output Describe monitors, printers, and audio
output devices Discuss combination input & output
devices
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
Keyboards Traditional keyboards
Flexible keyboards Ergonomic keyboards Wireless keyboards PDA keyboards
Features Typewriter keyboard with numeric pad Special purpose keys Toggle and combination keys
Mouse Mechanical Optical Cordless
or wireless Joystick Touch Screen Light Pen
Optical scanners Flatbed Portable
Bar code readers Handheld wand readers or platform scanners Contain photoelectric cells that read bar codes
Character and mark recognition devices Scanners that recognize special
characters & marks Magnetic ink character recognition (MICR) Optical-character recognition (OCR) Optical-mark recognition (OMR)
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
Graphics Tablets
Digital Notepads
Scanner
Light sensing equipment to translate images of text, drawing, photo into digital form
Types of Scanner
Scanners capture and digitize printed images. There are several types of scanners
Flatbed scannersHandheld scannersSheet-fed scannersDrum scanners
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
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
Sheet-fed
Item to be scanned is to be pulled into a stationary scanning mechanism
Smaller and less expensive than flatbed scanner
DRUM SCANNER
Item to be scanned rotates around stationary scanning mechanism
Very large and expensiveUsed in the publishing industry.
Scanner Devices
Optical scanner
Bar code readers
Character and Mark recognition
Optical Scanners
Convert text or drawings into machine readable format
Can be displayed, printed, or stored
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
Character & Mark Recognition
Magnetic-ink character recognition (MICR)Optical character recognition (OCR)Optical-mark recognition (OMR)
Magnetic-ink character recognition (MICR)
Reads magnetically encoded characters
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
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
Optical-mark recognition (OMR)