Flaw detection apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHaruhiko Yokoyama, Akira Kobayashi
Life of this patent
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Abstract
A flaw detection apparatus detects a flaw formed on an object's surface based on a digital image data indicative of said object's surface as a group of plural pixels utilizing the image processing technique. An image processor is provided for detecting a direction in which each of group extends to combine a plurality of groups extending in substantially the same direction. The image processor further produces a flaw signal indicating sizes of thus combined groups.
Claims5
A flaw detection apparatus for detecting a flaw formed on a surface of an object based on a plurality of first digital image data representing said surface as a plurality of first groups of plural pixels, each pixel of each first group being adjacent to each other, said apparatus comprising:
- first direction detection means for detecting a direction in which each first group extends based on the axis quadratic moment of each of said first groups by:
- a)first calculating the axis quadratic moment of each of said first groups, then
- b) assigning a value for the major axis angle of each of said first groups;
- first cluster means for combining said first groups that are disconnected and extend in directions different from each other less than a first predetermined degree based on the respective detected axis quadratic moment of each of said first groups and based on said major axis angle of each of said first groups;
- and
- first flaw signal producing means for producing a first flaw signal indicating sizes of said combined groups based on an area of said combined first groups and a rectangular circumscribing area of said combined first groups.
A flaw detection apparatus for detecting a flaw formed on a surface of an object based on a digital image data indicative of said surface as a plurality of groups of plural pixels adjacent to each other, said apparatus comprising:
- minor axis quadratic moment determining means for obtaining a minor axis quadratic moment of a combination of two of said groups that are disconnected by calculating one minor axis quadratic moment of a combined two groups;
- comparator means for comparing said determined minor axis quadratic moment with a predetermined minor axis quadratic moment;
- and
- cluster means for combining said two groups when said determined minor axis quadratic moment is less than said predetermined minor axis quadratic moment.
Dependencies are inferred from the claim text.