Image analysis – Image enhancement or restoration – Object boundary expansion or contraction
Patent
1997-10-14
2000-10-17
Lee, Thomas D.
Image analysis
Image enhancement or restoration
Object boundary expansion or contraction
382128, 382132, 382264, G06K 942, G06K 944
Patent
active
061343536
ABSTRACT:
A digital image (J.sub.o) processing method for automatic extraction of strip-shaped objects, includes a skeletonization operation with steps for forming smoothed images (J.sub.i) at several scales (.sigma..sub.i), and, in each smoothed image (J.sub.i), extracting boundaries of objects, extracting potential median pixels (.OMEGA..sub.iP) associated with the center (.OMEGA..sub.i) of a circle of radius (R.sub.i) proportional (k) to the scale (.sigma..sub.i), tangent to boundaries at a pair of distinct pixels (E.sub.1, E.sub.2), and associated with a measure of dependability regarding alignment of the center (.OMEGA..sub.i) and pixels of the pair, extracting median pixels .OMEGA..sub.iM, and constructing skeletons of objects by tracking in the digital image (J.sub.MED) formed by the extracted median pixels. The step of extracting median pixels .OMEGA..sub.im includes a first selection of potential median pixels of the same locations which have the maximum measure of dependability, and a second selection of remaining potential median pixels which locally have a maximum intensity in the direction of alignment .
REFERENCES:
patent: 5539838 (1996-07-01), Shimura
patent: 5768405 (1998-06-01), Makram-Ebeid
patent: 5933518 (1999-08-01), Cohen-Solal
By R.L. Ogniewicz "Skeleton-Space: A Multiscale Shape Description Combining Region and Boundary Information" Proceedings of the Computer Society Conference on Computer Vision a Pattern Recognition, Seattle, Jun. 21-23, 1994, Institute of Electrical and Electronics Engineers, pp. 746-751.
"Robust Object Representation Through Object-Relevant Use of a Scale" By Bryan Morse, Stephen Pizer Et Al. in "104, SPIE, vol. 2167, Image Processing, 1994, pp. 104-115".
"Computer Vision" By Dana H. Balard and Christopher M. Brown, Published by Prentice Hall, Inc. Englewood Cliffs, New Jersey, US, 07632, p. 77, Lines 6-17.
Lee Thomas D.
Renfrew, Jr. Dwight H.
U.S. Philips Corporation
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