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A QR code (quick-response code) is a type of two-dimensional matrix barcode, invented in 1994, by Japanese company Denso Wave for labelling automobile parts.[1][2] A QR code consists of black squares arranged in a square grid on a white background, including some fiducial markers, which can be read by an imaging device, such as a camera, and processed using Reed–Solomon error correction until the image can be appropriately interpreted. The required data are then extracted from patterns that are present in both the horizontal and the vertical components of the QR image.[3]
Whereas a barcode is a machine-readable optical image that contains information specific to the labelled item, the QR code contains the data for a locator, an identifier, and for web-tracking. To efficiently store data, QR codes use four standardized modes of encoding: (i) numeric, (ii) alphanumeric, (iii) byte or binary, and (iv) kanji.[4] Compared to standard UPC barcodes, the QR labelling system was applied beyond the automobile industry because of faster reading of the optical image and greater data-storage capacity in applications such as product tracking, item identification, time tracking, document management, and general marketing.[3]
^Hung, Shih-Hsuan; Yao, Chih-Yuan; Fang, Yu-Jen; Tan, Ping; Lee, RuenRone; Sheffer, Alla; Chu, Hung-Kuo (1 September 2020). "Micrography QR Codes". IEEE Transactions on Visualization and Computer Graphics. 26 (9): 2834–2847. doi:10.1109/TVCG.2019.2896895. ISSN 1077-2626. PMID 30716038. S2CID 73433883. Archived from the original on 21 April 2021. Retrieved 21 April 2021.
^Chen, Rongjun; Yu, Yongxing; Xu, Xiansheng; Wang, Leijun; Zhao, Huimin; Tan, Hong-Zhou (11 December 2019). "Adaptive Binarization of QR Code Images for Fast Automatic Sorting in Warehouse Systems". Sensors. 19 (24): 5466. Bibcode:2019Senso..19.5466C. doi:10.3390/s19245466. PMC 6960674. PMID 31835866.
^ ab"QR Code Essentials". Denso ADC. 2011. Archived from the original on 12 May 2013. Retrieved 12 March 2013.
^"QR Code features". Denso-Wave. Archived from the original on 29 January 2013. Retrieved 3 October 2011.
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