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Optical Scanner is a device use to scan various kinds of codes (BAR / QR) using optical mechanism. Usually Infrared used in shopping bill gun is perfect example .
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optical scanner is an input device using light beams to scan and digitally convert images, codes, text or objects as two-dimensional (2D) digital files and sends them to computers and fax machines. Flatbed scanning devices are the most popular optical scanners. Optical scanners are used for many purposes, including reading customized response forms, creating automated data fields and recording fingerprints.
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A device that can read text or illustrations printed on paper and translate the information into a form the computer can use. A scanner works by digitizing an image -- dividing it into a grid of boxes and representing each box with either a zero or a one, depending on whether the box is filled in. (For color and gray scaling, the same principle applies, but each box is then represented by up to 24 bits.) The resulting matrix of bits, called abit map, can then be stored in a file, displayed on a screen, and manipulated by programs.

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Optical Scanner is a device use to scan various kinds of codes (BAR / QR) using optical mechanism.

Usually Infrared used in shopping bill gun is perfect example .

Answer

Optical scanner, Computer input device that uses a light beam to scan codes, text, or graphic images directly into a computer or computer system.

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