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The digital step edgeThe facet model was used to accomplish step edge detection. The essence of the facet model is that any analysis made on the basis of the pixel values in some neighborhood has its final authoritative interpretation relative to the underlying grey tone intensity surface of which the neighborhood pixel values are observed noisy samples. Pixels which are part of regions have simple grey tone intensity surfaces over their areas. Pixels which have an edge in them have complex grey tone intensity surfaces over their areas. Specially, an edge moves through a pixel only if there is some point in the pixel's area having a zero crossing of the second directional derivative taken in the direction of a non-zero gradient at the pixel's center. To determine whether or not a pixel should be marked as a step edge pixel, its underlying grey tone intensity surface was estimated on the basis of the pixels in its neighborhood.
Document ID
19820020848
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Haralick, R. M.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Date Acquired
August 10, 2013
Publication Date
June 1, 1982
Publication Information
Publication: JPL Proc. of the NASA Workshop on Registration and Rectification
Subject Category
Earth Resources And Remote Sensing
Accession Number
82N28724
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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