J. Sporring, M. Nielsen, J. Weickert, O.F. Olsen,
A note on differential corner measures,
Proc. 14th Int. Conf. Pattern Recognition (ICPR 14, Brisbane,
Aug. 17-20, 1998), IEEE Computer Society Press, Los Alamitos,
Vol. 1, 652-654, 1998.
The isophote curvature times the gradient magnitude to some power
has been studied in the literature as a measure of cornerness in images,
and stability in terms of sampling noise has been proposed by selecting
corners in these measures at high scale and locating them at fine scale.
We will examine the problem of tracking extrema in these measures in
the linear scale-space and conclude that annihilations and creations
generically occur, so that corners in general cannot be tracked to
arbitrary fine/coarse scale. However, there are quantitative differences,
and the analysis indicates that isophote curvature times gradient
magnitude is best suited for binary images.
The full paper is available
online as well.
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