![]() ![]() Two dimensional barcodes uses a collection of small black squares densely arranged in a square grid. The first 2D barcode, Code 49, was developed in 1987 by David Allais at Intermed Corporation. Because of this high data density, 2D barcodes can be printed on electronic circuit boards and other small item where space is limited. Two dimensional barcordes are more sophisticated as they can hold significantly more data than 1D barcodes. This serves as a alternative way for a person to read the encoded information it the event the barcode is damaged or smudged, or when a scanner is not available. Additionally, 1D barcodes will typically have the human-readable version of the encoded information at the bottom - as illustrated below. Information is represented in a sequence of parallel black and white lines of varying width that is readable by a computer. The majority of the barcodes are commonly referred to as one-dimensional (1D). There are many others and each has its own design specifications. There is the UPC symbology used in consumer goods, ISBN used for books, and Codabar used in the healthcare industry. Many are designed for a specific purpose or industry. ![]() There are a variety of barcode symbologies used in the world today.
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