QR codes are now used in a much broader context, including both commercial tracking applications and convenience-oriented applications aimed at mobile-phone users (termed mobile tagging). QR codes can be displayed on buildings, such as this one being painted in Cape Town. The required data is then extracted from patterns that are present in both horizontal and vertical components of the image. Ī 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. Applications include product tracking, item identification, time tracking, document management, and general marketing. The quick response system became popular outside the automotive industry due to its fast readability and greater storage capacity compared to standard UPC barcodes. QR codes use four standardized encoding modes (numeric, alphanumeric, byte/binary, and kanji) to store data efficiently extensions may also be used. In practice, QR codes often contain data for a locator, identifier, or tracker that points to a website or application. A barcode is a machine-readable optical image that can contain arbitrary information, often used as a label. QR code for the URL of the English Wikipedia Mobile main pageĪ QR code (an initialism for quick response code) is a type of matrix barcode (or two-dimensional barcode) invented in 1994 by Japanese company Denso Wave for use as labels for automotive parts.
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