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Article

Identification of QR Code Perspective Distortion Based on Edge Directions and Edge Projections Analysis

1
Technical University in Zvolen, Faculty of Technology, Department of Manufacturing and Automation Technology, Masarykova 24, 960 01 Zvolen, Slovakia
2
Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Production Technologies, 917 24 Trnava, Slovakia
*
Author to whom correspondence should be addressed.
Received: 22 June 2020 / Revised: 6 July 2020 / Accepted: 8 July 2020 / Published: 10 July 2020
QR (quick response) Codes are one of the most popular types of two-dimensional (2D) matrix codes currently used in a wide variety of fields. Two-dimensional matrix codes, compared to 1D bar codes, can encode significantly more data in the same area. We have compared algorithms capable of localizing multiple QR Codes in an image using typical finder patterns, which are present in three corners of a QR Code. Finally, we present a novel approach to identify perspective distortion by analyzing the direction of horizontal and vertical edges and by maximizing the standard deviation of horizontal and vertical projections of these edges. This algorithm is computationally efficient, works well for low-resolution images, and is also suited to real-time processing. View Full-Text
Keywords: QR Code recognition; Quick Response Code localization; adaptive thresholding; finder pattern; perspective distortion; edge projections QR Code recognition; Quick Response Code localization; adaptive thresholding; finder pattern; perspective distortion; edge projections
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MDPI and ACS Style

Karrach, L.; Pivarčiová, E.; Božek, P. Identification of QR Code Perspective Distortion Based on Edge Directions and Edge Projections Analysis. J. Imaging 2020, 6, 67. https://0-doi-org.brum.beds.ac.uk/10.3390/jimaging6070067

AMA Style

Karrach L, Pivarčiová E, Božek P. Identification of QR Code Perspective Distortion Based on Edge Directions and Edge Projections Analysis. Journal of Imaging. 2020; 6(7):67. https://0-doi-org.brum.beds.ac.uk/10.3390/jimaging6070067

Chicago/Turabian Style

Karrach, Ladislav; Pivarčiová, Elena; Božek, Pavol. 2020. "Identification of QR Code Perspective Distortion Based on Edge Directions and Edge Projections Analysis" J. Imaging 6, no. 7: 67. https://0-doi-org.brum.beds.ac.uk/10.3390/jimaging6070067

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