Description of Gray Level Picture Using a Collection of Density Contour Lines

Takeshi AGUI  Masayuki NAKAJIMA  Kiyotaka MATSUBARA  

IEICE TRANSACTIONS (1976-1990)   Vol.E65   No.1   pp.36-43
Publication Date: 1982/01/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Data Processing

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An extraction method of density contour lines of gray level pictures is described. Two kinds of quads composed of four image pixels and non-image pixels are defined for making the density contour lines simple closed paths. From the resultant density contour lines of simple closed paths, a tree graph is made for executing the recognition of a house included in a monochromatic aerial photo of an urban area.