Explain optical flow, in context of motion perception in computer vision.

Optical flow refers to the apparent motion of objects, surfaces, and edges within a visual scene, caused by the relative motion between an observer (typically a camera) and the scene. In the context of Digital Image Processing and Computer Vision, optical flow is a fundamental concept used to estimate motion by analyzing sequential frames from a video or a series of images ________ __________ _______ ________ ________ ______ _________.
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