Image analysis – Pattern recognition – Feature extraction
Patent
1996-01-16
1998-09-01
Couso, Yon J.
Image analysis
Pattern recognition
Feature extraction
382278, 382291, G06K 948, G06K 964, G06K 936
Patent
active
058022066
ABSTRACT:
A method is provided for determining edge positions by evaluating digitized electrical signals which are obtained when scanning at least one light-dark structure by means of photoreceivers. The method is characterized in that the regions of four adjacent photoreceivers (i; i+1; i+2; i+3), in the middle of which is located an edge to be determined, are first determined from the signals Y.sub.i, in that the type of edge, light edge, dark edge or dark-light edge or white-black transition or black-white transition is then determined from the signals Y.sub.i, in that a value Mi is formed from the signals of the first two photoreceivers (i; i+1) in such a way that Mi is the extreme of Y.sub.i and Y.sub.i+1 to be expected for the determined type of edge, in that a value Ma is formed from the signals of the two other photoreceivers (i+2; i+3) in such a way that Ma is the extreme of Y.sub.i+2 and Y.sub.i+3 to be expected for the determined type of edge, and in that the position x of the edge to be determined is then determined with reference to the dividing edge of the two photoreceivers i+1; i+2 in units of the photoreceiver dimensions according to the following equation: ##EQU1##
REFERENCES:
patent: 4817174 (1989-03-01), Nakatani
patent: 4969202 (1990-11-01), Groezinger
patent: 5144684 (1992-09-01), Inada et al.
Steinbach & Weblau Bilderfassung bei einem automatischen Koordinatenmessgerat, "Wiss. Zeitschrift der TU Dresden", 1976, 4, 951-953.
Steinbach & Weblau. Das Koordinaten-und Strukturmessgerat m100, "Jenear Rundschau", 1979, 2, 84-88.
Pattern Recognition, Mike James, Chapter Three, "Grey Level Features--I Edges and Lines", 1988.
Carl Zeiss Jena GmbH
Couso Yon J.
Nguyen Ha Tran
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