Jepson, A.D. and Fleet, D.J.
Phase singularities in scale-space.
Image and Vision Computing Journal, 9(5): 338--343, 1991
This paper concerns the use of phase information from band-pass signals for
the measurement of binocular disparity, optic flow, and image orientation.
Towards this end, one of the important properties of band-pass phase
information is its stability with respect to small geometric deformations
and contrast changes.
However, in particular regions phase can also be very unstable due
to the occurrence of phase singularities.
We discuss the existence of phase singularities, and their relation to
the neighbourhoods where phase is unreliable. Moreover,
we present a simple method for detecting these regions of instability.
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