Rotoscoping is an animation technique that animators use to trace over motion picture footage, frame by frame, to produce realistic action. Originally, animators projected photographed live-action movie images onto a glass panel and traced over the image. This projection equipment is referred to as a rotoscope, developed by Polish-American animator Max Fleischer, and the result is a rotograph. This device was eventually replaced by computers, but the process is still called rotoscoping. #Sakuga

MASK and ROTOSCOPE in After Effects - Learn everything about masks (easy beginner tutorial)

How to Use the Roto Brush 3 with Generative Fill | After Effects Rotoscoping Tutorial