Fleet, D.J. and Jepson, A.D.
Computation of component image velocity from local phase information.
International Journal of Computer Vision, 5(1): 77--104, 1990
ABSTRACT
We present a technique for the computation of 2-d
component velocity from image sequences.
Initially, the image sequence is represented by a family
of spatiotemporal velocity-tuned linear filters.
Component velocity, computed from spatiotemporal responses of
identically tuned filters, is expressed in terms of the local
first-order behaviour of surfaces of constant phase.
Justification for this definition is discussed from the perspectives of
both 2-d image translation and deviations from translation
that are typical in perspective projections of 3-d scenes.
The resulting technique is predominantly linear,
efficient, and suitable for parallel processing.
Moreover, it is local in space-time, robust with respect to noise,
and permits multiple estimates within a single neighbourhood.
Promising quantitative results are reported from experiments with realistic
image sequences, including cases with sizeable perspective deformation.
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