Canlas, F. Q.; Tiocson, G. U.; Caraig, C. M. D. C.; Alon, A. S. Maintaining the Use of Face Maks in an Indoor Establishment Conforming With the COVID-19 Protocols Thru Computer Vision Model: An Approach to Detect Mouth As Region of Interest. IRJIEST 2021, 7, 33-38.