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A barcode is symbol, or a machine-readable representation of data, which carries information about the object or person to which it is attached. Our printers use different combinations of bars and spaces to encode data into barcodes that are printed on a label or a card. Barcodes can be one dimensional or two dimensional, and they can be read by special optical scanners or barcode readers, desktop printers, and smart phones
Laser scanners use a laser beam as the light source and typically employ either a reciprocating mirror or a rotating prism to scan the laser beam back and forth across the bar code, CCD readers use an array of hundreds of tiny light sensors lined up in a row in the head of the reader. Each sensor measures the intensity of the light immediately in front of it. The important difference between a CCD reader and a laser scanner is that the CCD reader is measuring emitted ambient light from the bar code whereas a laser scanner is measuring reflected light of a specific frequency originating from the scanner itself.