2D barcodes can also be read by a digital camera connected to a microcomputer running software that takes a photographic image of the barcode and analyzes the image to deconstruct and decode the 2D barcode. 2D barcodes can be read using purpose-built 2D optical scanners, which exist in a few different forms. Later, two-dimensional (2D) variants were developed, using rectangles, dots, hexagons and other patterns, called matrix codes or 2D barcodes, although they do not use bars as such. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called barcode readers, of which there are several types.
Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. For a code of conduct for barristers, see Legal ethics.Ī barcode or bar code is a method of representing data in a visual, machine-readable form. For the taxonomic method, see DNA barcoding.
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