Interpretation Of Motion Trajectories Using Focus Of Expansion

    Authors

    K. Rangarajan;M. Shah

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Pattern Anal. Mach. Intell.

    Keywords

    Dynamic Scene Analysis; Focus Of Expansion; Motion; Trajectories; Optical-Flow; Computer Science, Artificial Intelligence; Engineering, Electrical &; Electronic

    Abstract

    The focus of expansion (FOE) of a group of motion trajectories is defined to be a point in the image plane at which the trajectories intersect when they are extended. The FOE observed over a time sequence defines the locus of FOE. We present an analytical approach for the study of dynamic events as they project on the image plane by analyzing the locus of FOE. We have found that the locus of FOE can be used to make qualitative assertions regarding the type of motion. An interesting behavior of the locus of FOE for various types of motion is observed. The cases include a single point, a horizontal, a vertical, and a slopped straight line. We can also determine whether the object has approaching and receding motion or when the object changes its direction of motion. This inference may be used in qualitative computer vision.

    Journal Title

    Ieee Transactions on Pattern Analysis and Machine Intelligence

    Volume

    14

    Issue/Number

    12

    Publication Date

    1-1-1992

    Document Type

    Letter

    Language

    English

    First Page

    1205

    Last Page

    1210

    WOS Identifier

    WOS:A1992KC57300007

    ISSN

    0162-8828

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