OPTICAL SCANNER
An optical scanner, also known simply as a scanner, accepts documents consisting of texts and/or images and converts them into machine readable form.These devices donot recognize individual letters images.Rather,they recognize light, dark and coloured areas that make up individual letters or images.Typically, scanned documents are saved in files that can be further processed, displayed, printed, or stored for later use.
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An optical scanner, also known simply as a scanner, accepts documents consisting of texts and/or images and converts them into machine readable form.These devices donot recognize individual letters images.Rather,they recognize light, dark and coloured areas that make up individual letters or images.Typically, scanned documents are saved in files that can be further processed, displayed, printed, or stored for later use.
Courtesy : http://www.slideshare.net/askme/chapter-11-280487?related=2