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QR code
![QR codes can be displayed on buildings, such as this one being painted in [[Cape Town]].](https://commons.wikimedia.org/wiki/Special:FilePath/How QR codes are created.jpg?width=200 "QR codes can be displayed on buildings, such as this one being painted in [[Cape Town]].")
![Meaning of format information. In the above figure, the format information is protected by a (15,5) BCH code, which can correct up to 3 bit errors. The total length of the code is 15 bits, of which 5 are data bits (2 EC level + 3 mask pattern) and 10 are extra bits for error correction. The '''format mask''' for these 15 bits is: [101010000010010]. Note that we map the masked values directly to its meaning here, in contrast to image 4 "Levels & Masks" where the mask pattern numbers are the result of putting the 3rd to 5th mask bit, [101], over the 3rd to 5th format info bit of the QR code.](https://commons.wikimedia.org/wiki/Special:FilePath/QR Format Information.svg?width=200 "Meaning of format information. In the above figure, the format information is protected by a (15,5) BCH code, which can correct up to 3 bit errors. The total length of the code is 15 bits, of which 5 are data bits (2 EC level + 3 mask pattern) and 10 are extra bits for error correction. The '''format mask''' for these 15 bits is: [101010000010010]. Note that we map the masked values directly to its meaning here, in contrast to image 4 \"Levels & Masks\" where the mask pattern numbers are the result of putting the 3rd to 5th mask bit, [101], over the 3rd to 5th format info bit of the QR code.")
TRADEMARK FOR A TYPE OF MATRIX BARCODE
ISO/IEC 18004; QR codes; QRcode; I-nigma; 2D Key; Barcode link; MicroQR; SQR codes; QR Code; QR image; Qr code; QR-code; Attaging; Custom qr code; Artistic qr code; Designer qr code; Quick response code; High Capacity Colored 2-Dimensional (HCC2D) Code; HCC2D (High Capacity 2-dimensional) codes; Micro QR code; Micro QR; Micro qr code; Micro qr
A QR code (an initialism for quick response code) is a type of matrix barcode (or two-dimensional barcode) invented in 1994 by the Japanese automotive company Denso Wave. A barcode is a machine-readable optical label that can contain information about the item to which it is attached.
QR decomposition
MATRIX DECOMPOSITION
QR factorization; QR factorisation; LQ decomposition; RQ decomposition; QL decomposition; QRD; QR Factorization; Qr factorization; QR Decomposition; Qr decomposition; Qr Decomposition
In linear algebra, a QR decomposition, also known as a QR factorization or QU factorization, is a decomposition of a matrix A into a product A = QR of an orthogonal matrix Q and an upper triangular matrix R. QR decomposition is often used to solve the linear least squares problem and is the basis for a particular eigenvalue algorithm, the QR algorithm.
EPC QR code
The European Payments Council Quick Response Code guidelines define the content of a QR code that can be used to initiate SEPA credit transfer (SCT). It contains all the necessary information in clear text.
