Department of Electrical and Computer Engineering
Rutgers University, Piscataway, NJ 08854-8058, USA
A nonparametric estimator of density gradient, the mean shift,
is employed in the
joint, spatial-range (value) domain of gray level and color images
for discontinuity preserving filtering and image segmentation.
Properties of the mean shift are reviewed and its convergence on
lattices is proven. The proposed filtering method
associates with each pixel in the image the closest local mode
in the density distribution of the joint domain.
Segmentation into a piecewise constant structure requires only one
more step, fusion of the regions associated with nearby modes.
The proposed technique has two parameters controlling
the resolution in the spatial and range domains.
Since convergence is guaranteed, the technique does not require
the intervention of the user to stop the filtering at the desired
image quality. Several examples, for gray and color images,
show the versatility of the method and compare favorably
with results described in the literature for the same images.
7th International Conference on Computer Vision,
Kerkyra, Greece, September 1999, 1197--1203.
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