For example, a common use of planar tracking is to replace a computer screen or billboard in a video with a custom image or animation. This technique is used in a variety of applications, such as adding visual effects or graphics to live-action footage, or replacing a portion of an image with a different element. It involves analyzing the movement of a selected region of the image, such as a flat surface or pattern, and using that data to create a tracking data that can be used to composite digital elements into the scene. Planar tracking is a technique used in CGI (computer-generated imagery) to accurately track the motion and position of an object within a 2D plane, typically within a video clip.
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