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Recognizing Patterns In Log-Polar CoordinatesLog-Hough transform is basis of improved method for recognition of patterns - particularly, straight lines - in noisy images. Takes advantage of rotational and scale invariance of mapping from Cartesian to log-polar coordinates, and offers economy of representation and computation. Unification of iconic and Hough domains simplifies computations in recognition and eliminates erroneous quantization of slopes attributable to finite spacing of Cartesian coordinate grid of classical Hough transform. Equally efficient recognizing curves. Log-Hough transform more amenable to massively parallel computing architectures than traditional Cartesian Hough transform. "In-place" nature makes it possible to apply local pixel-neighborhood processing.
Document ID
19920000489
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Weiman, Carl F. R.
(Transitions Research Corp.)
Date Acquired
August 15, 2013
Publication Date
August 1, 1992
Publication Information
Publication: NASA Tech Briefs
Volume: 16
Issue: 8
ISSN: 0145-319X
Subject Category
Mathematics And Information Sciences
Report/Patent Number
MSC-21758
Accession Number
92B10489
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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