The barcode systems are image and graphics recognition auto-ID systems and are thus used to identify the objects. This technology is used not only in logistics, but also in buildings and construction sites.
The barcode information is read with optical barcode readers. The barcodes can be 1-, 2-, 3- and 4-dimensional. The one-dimensional barcode, the EAN code, is a numeric code that can represent an 8- or 13-digit number with numbers from 0 to 9. The two-dimensional barcode can increase the information density per unit area. The two-dimensional barcode is a data matrix code that consists of information-relevant and redundant data, which allows error detection and correction. A three-dimensional barcode increases the information density per unit area by encoding the information in patterns consisting of colored dots.

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