Extraction of QR Codes on Flat and Cylindrical Surface
Zhifeng Shi, Xiaochao Li, Cuicui Zhao, Shuqiang Lin · International Conference on Electric Information and Control Engineering · 2012
Traditional methods usually hypothesize that QR codes are printed on flat surfaces. This work proposes an extraction method of QR-codes printed on both flat and cylindrical surface. First, finder patterns are extracted from detecting gravity points and corners of closed contours, An efficient Hough Transform with a restrained parameter space is then employed to extract the boundary of code region, The code is reconstructed by directly mapping from 3D coordinates to the image plane thus the data of code could be restored. The experiment shows that the method is effective.