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  2. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_code

    Model 1. Model 1 QR code is an older version of the specification. It is visually similar to the widely seen model 2 codes, but lacks alignment patterns. Differences are in the bottom right corner, and in the midsections of the bottom and right edges are additional functional regions.

  3. File:QR Code Model 1 Example.svg - Wikipedia

    en.wikipedia.org/wiki/File:QR_Code_Model_1...

    English: Example of a model 1 QR code, which is an older version of the standard that most smartphones cannot read. Content: "QR Code Model 1"

  4. Reed–Solomon error correction - Wikipedia

    en.wikipedia.org/wiki/Reed–Solomon_error...

    function [decoded, error_pos, error_mag, g, S] = rsDecoder (encoded, m, prim_poly, n, k) % RSDECODER Decode a Reed-Solomon encoded message % Example: % [dec, ~, ~, ~, ~] = rsDecoder(enc_msg, 8, 301, 12, numel(msg)) max_errors = floor ((n-k) / 2); orig_vals = encoded. x; % Initialize the error vector errors = zeros (1, n); g = []; S = []; % Get ...

  5. QR algorithm - Wikipedia

    en.wikipedia.org/wiki/QR_algorithm

    Formally, let A be a real matrix of which we want to compute the eigenvalues, and let A0 := A. At the k -th step (starting with k = 0 ), we compute the QR decomposition Ak = Qk Rk where Qk is an orthogonal matrix (i.e., QT = Q−1) and Rk is an upper triangular matrix. We then form Ak+1 = Rk Qk. Note that.

  6. Barcode - Wikipedia

    en.wikipedia.org/wiki/Barcode

    A UPC-A barcode. A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called barcode ...

    • List of HTTP status codes - Wikipedia
      List of HTTP status codes - Wikipedia
      wikipedia.org
  7. Mobile payment - Wikipedia

    en.wikipedia.org/wiki/Mobile_payment

    The QR code is presented by the payee, in a static or one time generated fashion and it is scanned by the person executing the payment. Mobile self-checkout allows for one to scan a QR code or barcode of a product inside a brick-and-mortar establishment in order to purchase the product on the spot.