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Proceedings Paper

Grey-level encoding of openings and closings
Author(s): James R. Parker; D. Horsley
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Paper Abstract

A distance transform will convert a bi-level image into a gray scale image, where the intensity of the object pixels is proportional to their distance from the nearest back-ground pixel. This can be computed in two passes through an image, and has been used to encode all binary erosions and dilations into one `globally eroded' image. It is also possible to encode all possible binary openings and closings as gray levels, allowing any particular opening or closing to be achieved through a simple thresholding operation, or by non-destructive comparisons. We define nodal points in the distance transform as those which have no neighbors having the maximum possible value (For example, 7 for diagonal pixels, and 12 for others using Euclidean distance). At each of these points a digital circle can be drawn, whose values equal that of the significant point. A simple histogram of the thus encoded image yields the roughness spectrum, but the spectrum found using only the significant points may be just as useful.

Paper Details

Date Published: 1 December 1993
PDF: 6 pages
Proc. SPIE 2060, Vision Geometry II, (1 December 1993); doi: 10.1117/12.165009
Show Author Affiliations
James R. Parker, Univ. of Calgary (Canada)
D. Horsley, Univ. of Calgary (Canada)

Published in SPIE Proceedings Vol. 2060:
Vision Geometry II
Robert A. Melter; Angela Y. Wu, Editor(s)

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