Sheu, Jia-Shing, and Kai-Chung Teng. “Improvement of QR Code Recognition Based on Pillbox Filter Analysis”. International Journal of Engineering and Technology Innovation 3, no. 2 (April 1, 2013): 123–133. Accessed November 22, 2024. https://ojs.imeti.org/index.php/IJETI/article/view/104.