Monday, January 17, 2011

Input and Output

Ergonomic Keyboard


An ergonomic keyboard is a computer keyboard designed with ergonomic considerations to minimize muscle strain and a host of related problems. The advantage of ergonomic keyboard may reduce muscle strain and reduce risk of Carpal Tunnel Syndrome, but there is no clear evidence of benefit. After a user takes the time to adjust to this style of keyboard, these keyboards can make typing easier, faster and less awkward. Disadvantage is some ergonomic keyboards are highly priced, though not necessarily so. They may take a little practice to get used to, and many people don't want to go to the trouble of adjusting. These keyboards may take more space on your computer table and force the mouse to be farther away.


Ink-jet Printer




An ink-jet printer is a type of computer printer that creates a digital image by propelling variable-sized droplets of ink onto paper. Inkjet printers are the most commonly used type of printer and range from small inexpensive consumer models to very large professional machines.





Laser Printer


A laser printer is a common type of computer printer that rapidly produces high quality text and graphics on plain paper. As with digital photocopiers and multifunction printers (MFPs), laser printers employ a xerographic printing process but differ from analog photocopiers in that the image is produced by the direct scanning of a laser beam across the printer's photoreceptor.






Magnetic-ink character reader (MIR)



Magnetic-ink character reader is a character recognition technology used primarily by the banking industry to facilitate the processing of cheques. The technology allows computers to read information (such as account numbers) off of printed documents. Unlike barcodes or similar technologies, however, MICR codes can be easily read by humans.






Optical-character recognition(OCR)


Optical-character recognition is the mechanical or electronic translation of scanned images of handwritten, typewritten or printed text into machine-encoded text. It is widely used to convert books and documents into electronic files, to computerize a record-keeping system in an office, or to publish the text on a website. OCR makes it possible to edit the text, search for a word or phrase, store it more compactly, display or print a copy free of scanning artifacts, and apply techniques such as machine translation, text-to-speech and text mining to it. OCR is a field of research in pattern recognition, artificial recognition and computer vision.


Optical-mark recognition (OMR)



Optical-mark recognition also called Optical Mark Reading and (OMR) is the process of capturing human-marked data from document forms such as surveys and tests.

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