Bar coding is an optical method of achieving automatic identification. It relies on visible or invisible light being reflected off of a printed pattern. The dark bars or dark areas within the pattern absorb light, and the intervening spaces or areas reflect light. The contrasting absorption and reflection is sensed by advice that “reads” this reflected pattern and decodes the information.
Bar coding is an optical method of achieving automatic identification. It relies on visible or invisible light being reflected off of a printed pattern. The dark bars or dark areas within the pattern absorb light, and the intervening spaces or areas reflect light. The contrasting absorption and reflection is sensed by advice that “reads” this reflected pattern and decodes the information.
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