Recognizing Objects From Curvilinear Motion

Abstract

This paper introduces an object recognition strategy based on the following premises: i) an object can be identified on the basis of the optical flow it induces on a stationary observer, and ii) a basis for recognition can be built on the appearance of flow corresponding to local curvilinear motion. Unlike other approaches that seek to recognize particular motions, ours focuses on the problem of recognizing objects by training on an expected set of motions. A sequential estimation framework is used to solve the implicit factorization problem, which is itself simplified in that the task is to discriminate between different objects as opposed to recovering motion or structure. Training is accomplished automatically using a robot mounted camera system to induce a set of canonical motions at different locations on a viewsphere. Experimen-tal results are presented to support our contention that the resulting motion basis can generalize to a fairly wide range of motions, leading to a practical method for recognizing moving objects. 1