Image analysis – Image transformation or preprocessing – Measuring image properties
Patent
1997-08-05
1999-10-12
Boudreau, Leo H.
Image analysis
Image transformation or preprocessing
Measuring image properties
382151, 382205, G06K 936, G06K 900, G06K 956
Patent
active
059664720
ABSTRACT:
An automatic recognition method capable of accurately determining edges of a concavity or convexity in order to achieve an improved measuring accuracy in recognition of a concavity or convexity. This method comprises the steps of: converting a photographic image of an object having a concavity or convexity defined therein into data in a specified feature space; obtaining a plurality of points that exist outside a virtual circle determined by a virtual center of the concavity or convexity, the virtual center being established for each elementary area of the image converted into the feature space data; obtaining the equation of a plane that passes through the plurality of points; detecting symmetric pairs of pixels in each elementary area of the feature space data with respect to the corresponding virtual concavity or convexity center; and recognizing the position of the concavity or convexity of the object when the symmetric pixels satisfy the equation of the plane.
REFERENCES:
patent: 4555798 (1985-11-01), Broadbent, Jr. et al.
patent: 5778107 (1998-07-01), Kataoka
Kataoka Takayuki
Matsumoto Ken'ichiro
Boudreau Leo H.
Cage Shawn B.
Komatsu Limited
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