Algorithm for Locating the Vertices of a QR Code and Removing Perspective


  • Heitor Eugênio Gonçalves Universidade Federal de Uberlândia
  • Luciano Xavier Medeiros
  • Alexandre Coutinho Mateus


QR Code, perspective, image correction, image recognition, image processing


Scanning QR Codes from cellular phone cameras has made reading this type of two-dimensional code more accessible. However, QR Code photos may show geometric distortions caused by camera positioning in relation to the image to be read and thereby, resulting in a perspective image. These deformations make it difficult to decode QR Codes and thinking about it, this article proposes an algorithm that, first, finds the vertices of the polygon that delimits the area of a QR Code and from the coordinates of these vertices, the algorithm removes the perspective from the image.


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How to Cite

Eugênio Gonçalves, H., Xavier Medeiros, L. ., & Coutinho Mateus, A. . (2021). Algorithm for Locating the Vertices of a QR Code and Removing Perspective. IEEE Latin America Transactions, 19(11), 1933–1940. Retrieved from