Chantorn, T., N. Theera-Umpon, and S. Auephanwiriyakul. “Bracket move inspection using canny edge detection”. Asia-Pacific Journal of Science and Technology, vol. 13, no. 4, Apr. 2017, pp. 451-6, https://so01.tci-thaijo.org/index.php/APST/article/view/83706.