Detecting Motion Pattern in Optical Flow Fields

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Presentation transcript:

Detecting Motion Pattern in Optical Flow Fields We can compute the local speed gradient to detect certain basic motion patterns. The speed gradient is defined as the direction of the steepest speed increase, regardless of the direction of motion. May 3, 2018 Computer Vision Lecture 23: Motion Analysis

Detecting Motion Pattern in Optical Flow Fields There are four different basic motion patterns: counterclockwise and clockwise rotation, contraction, and expansion. They can be combined to form spiral motion. counterclockwise clockwise contraction expansion movement speed gradient Idea: A consistent angle between the direction of movement and the orientation of the speed gradient indicates a specific motion pattern. May 3, 2018 Computer Vision Lecture 23: Motion Analysis

Detecting Motion Pattern in Optical Flow Fields Angles other than 0, 90, 180, and 270 degrees correspond to spiral motion patterns. direction of movement orientation of speed gradient May 3, 2018 Computer Vision Lecture 23: Motion Analysis

Computer Vision Lecture 23: Motion Analysis And this is… The End May 3, 2018 Computer Vision Lecture 23: Motion Analysis