AI Rotoscoping and Object Removal in Video

Rotoscoping separates a subject from its background by building a mask that follows the subject over time. AI-assisted tools can propose that mask from a few user selections and track it through a clip. Object removal is a related task: the editor marks an unwanted object, and software attempts to replace the covered area with plausible surrounding imagery. The two tasks have different goals—keep the selected subject, or remove an element from the scene. DaVinci Resolve Studio’s Magic Mask uses user clicks to guide a mask for people or objects and tracks it as the clip changes. Blackmagic’s Resolve 20.1 guide says the generated mask will not always be perfect and describes refining it with positive and subtractive points or other mask tools. Blackmagic also lists object removal as a Studio feature. These examples show what a specific application offers; other tools and versions differ. Start on a frame where the subject is visible, select a few representative points, and analyze the clip. Inspect the beginning, end, occlusions, fast movement, hair, motion blur, reflections, and similar-color edges. Correct the mask where it leaks or misses parts of the subject. For object removal, check that the fill does not invent a moving texture, repeat a background pattern, or erase an object that should remain. Review the full clip at normal speed and at frame-by-frame detail. Watch for flicker, edge halos, changing silhouettes, or a background that seems to warp. Keep the original footage and a clean version available. If artifacts affect a face, product detail, archival evidence, or safety-critical information, use a different shot or disclose the alteration according to the project’s requirements.