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Everything about QR code

Type of two-dimensional barcode

A QR code, short for quick-response code, is a type of two-dimensional matrix barcode invented in 1994 by Masahiro Hara of the Japanese company Denso Wave for labelling automobile parts. It features white ("0") and black ("1") squares within a square grid featuring fiducial markers on the corners, readable by imaging devices like cameras, and processed using Reed–Solomon error correction until the image can be appropriately interpreted. The required data is then extracted from patterns that are present in both the horizontal and the vertical components of the QR image. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: QR codeA 5-minute orientation
  2. Skim a recent paper: Suppressing quantum errors by scaling a surface code logical qubitInfluential work since 2022
  3. Pick up a classic book: Deeper Learning With QR Codes and Augmented RealityThe most-reprinted book on the subject
  4. Read the landmark paper: Backpropagation Applied to Handwritten Zip Code RecognitionCited 9,944 times
  5. Go sideways: Rectangular Micro QR CodeA closely related topic
  6. Go sideways: PDF417A closely related topic

📖 Definitions

No dictionary entry for this exact phrase.

🗂️ The subject at a glance

  1. History
  2. Adoption
  3. Uses
  4. Risks
  5. Design
  6. Standards
  7. Variants
  8. License
  9. Other 2-D barcodes

🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

Ranked by number of editions on Open Library, a rough measure of how lasting a book is.

🔗 Related topics