Method for inspecting defects in the shape of object
First Claim
1. A method of inspecting for defects in an object, comprising the steps of:
- preparing a reference image representing at least a portion of a shape as a grayscale of unidirectionally varying unique values extending across a boundary of the shape within a range of tolerance accommodating occurrence of pixel noise;
obtaining an image from the object to be inspected;
making a comparison between an optical characteristic of corresponding areas of said reference image and the image obtained from the object; and
making a determination of whether said optical characteristic for said image obtained is within said range of tolerance of said corresponding area of said reference image.
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Accused Products
Abstract
A method of inspecting for defects in the shape of an object, using an inspected image obtained from an object to be inspected, comprising the steps of: setting a reference image of a reference model for determining the defect in shape of the object to be inspected; obtaining the imaged image from the object to be inspected; comparing the corresponding whole or local area of the reference image with the inspected image in terms of brightness; and determining as to whether or not the object is defective in shape. According to the present invention, the shape defect inspection does not rely upon the skilled person'"'"'s experience, can reduce time required for inspection, and can be made for the whole area of the inspection area.
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Citations
20 Claims
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1. A method of inspecting for defects in an object, comprising the steps of:
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preparing a reference image representing at least a portion of a shape as a grayscale of unidirectionally varying unique values extending across a boundary of the shape within a range of tolerance accommodating occurrence of pixel noise;
obtaining an image from the object to be inspected;
making a comparison between an optical characteristic of corresponding areas of said reference image and the image obtained from the object; and
making a determination of whether said optical characteristic for said image obtained is within said range of tolerance of said corresponding area of said reference image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of inspecting for defects in an object, comprising the steps of:
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preparing a reference image representing at least a portion of a shape as a grayscale of unidirectionally varying unique values extending across a salient feature of the shape within a range of tolerance accommodating occurrence of pixel noise;
establishing a minimum value and a maximum value of a characteristic common to each of a plurality of reference pixels forming said reference image;
obtaining an image from the object to be inspected;
making a comparison between a representative value of said characteristic for each of a plurality of inspection pixels forming said image obtained from the object, and said minimum value and said maximum value for a corresponding one of said reference pixels;
making a determination of whether the object to be inspected is within a range of manufacturing tolerance, in dependence upon said comparison. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of inspecting for defects in an object, comprising the steps of:
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preparing a reference image representing at least a portion of a shape as a grayscale of values varying unidirectionally across a distinctive feature of the shape, between a minimum value and a maximum value of the grayscale;
establishing from said reference image, a range of tolerance accommodating occurrence of pixel noise between said minimum value and said maximum value;
obtaining an image from the object;
making a comparison in portions where the reference image and the inspection image mutually correspond, between a representation of said distinctive feature for each of a plurality of inspection pixels forming said image, and said range of tolerance; and
making a determination of whether the object meets manufacturing specifications, in dependence upon said comparison. - View Dependent Claims (19, 20)
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Specification