Okarma, Krzysztof, and Piotr Lech. “Fast Statistical Image Binarization of Colour Images for the Recognition of the QR Codes”. Elektronika ir Elektrotechnika 21, no. 3 (June 5, 2015): 58-61. Accessed September 25, 2022. https://eejournal.ktu.lt/index.php/elt/article/view/10397.