Hierarchical feature tracking using optical flow

Details Hierarchical feature tracking using optical flow Hierarchical feature tracking using optical flow

2011-03-22

2011-03-22

Carter, Aaron W (Department: 2624)

Image analysis

Applications

Target tracking or detecting

C382S100000, C382S181000, C382S190000, C382S240000, C382S276000

Reexamination Certificate

active

07912248

ABSTRACT:
An image processing apparatus enables efficient feature point tracking. A displacement calculating unit reads a hierarchical tier image with the smallest image size from each of a reference pyramid and a tracking pyramid in an image memory, and performs repetitive detection of a tracking point using a hierarchical gradient method. The displacement calculating unit repeatedly calculates a displacement amount between the feature points, and outputs a value of a repetition count of tracking point detection until convergence of the displacement amount and the value of the displacement amount at a time of convergence. A repetition criterion setting unit changes the criterion for determination of displacement amount convergence based on the repetition count and displacement amount. The displacement calculating unit reads upper hierarchical tier images and detects a tracking point according to the changed criterion. The repetitive tracking point detection and convergence determination criterion setting change are repeated.

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