Image analysis – Image enhancement or restoration – Image filter
Patent
1993-06-22
1997-04-29
Boudreau, Leo
Image analysis
Image enhancement or restoration
Image filter
382274, G06K 900
Patent
active
056257171
ABSTRACT:
An image processing device includes: a DOG filtering means for applying a DOG filter upon the grey level image of an object; and a tri-level thresholding means for thresholding the output of the DOG filtering means at two distinct threshold levels, thereby obtaining a tri-level image of the object. The 0-level regions of the tri-level image correspond to regions of the original image, such as the surface areas of the object, within which the variation of the grey level is small. The boundary between two 0-regions is marked by adjacent parallel strips of a (+)-region and a (-)-region, wherein the zero-crossing line between the (+)-region and the (-)-region clearly defines the contour line of the 0-regions. This method of tri-level quantization provides a basis for efficient template matching of the images of objects, recognition or identification of objects, the detection of movement vectors of objects, and the detection of the parallax of a continuously moving objects.
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Hashimoto Manabu
Sumi Kazuhiko
Boudreau Leo
Kelley Chris
Mitsubishi Denki & Kabushiki Kaisha
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