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How is optical sensing accomplished?

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This is usually accomplished by the use of various photoelectric devices. In one method, known as optical character recognition, a computer is given the capability of "reading" printed characters. Reflected or transmitted light from the character strikes an array of photoelectric cells, which effectively dissect it into light and dark areas. By analysis of these areas the computer is able to recognize the character, with some tolerance for less than perfect and uniform printing.

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