Barcode
A barcode (also bar code) is a
machine-readable representation of information (usually dark ink on a light background to create high and low reflectance which is converted to 1s and 0s). Originally, barcodes stored data in the widths and spacings of printed parallel lines, but today they also come in patterns of dots, concentric circles, and text codes hidden within images. Barcodes can be read by
optical scanners called
barcode readers or scanned from an image by special software. Barcodes are widely used to implement
Auto ID Data Capture (AIDC) systems that improve the speed and accuracy of
computer data entry. An advantage over other methods of AIDC is that it is less expensive to implement. It will cost about US$0.005 to implement a barcode compared to passive
RFID which still costs about US$0.07 to US$0.30 per tag.
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