Ravi Kumar received the B.Sc. (Hons.) degree in physics from the University of Delhi, India, in 2012, the M.Sc. degree in applied physics from the Indian School of Mines, Dhanbad, India, in 2015, and the Ph.D. degree from the Indian Institute of Technology (ISM) Dhanbad, India, in 2018. He is a Post-Doctoral Fellow with the Department of Mechanical Engineering, National University of Singapore. His research interest includes optical and digital image encryption, optical metrology, digital image correlation, and image processing.