Detection of surface defects employing subsampled images
First Claim
1. A system for identifying a surface defect in an image of an object, the image comprising a multiplicity of pixels, the system comprising:
- choosing a region in which a surface defect is to be identified;
subsampling the region thereby producing a subsampled image of the region;
analyzing the subsampling image and identifying therefrom a surface defect in the region.
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Abstract
A method for determining a location of a border in a color image, the image including at least two color populations, between a first color region associated with a first one of the two color populations and a second color region associated with a second one of the two color populations, both the first color region and the second color region being in the color image, the method includes identifying an approximate border location between the first color region and the second color region, determining a plurality of candidate border locations between the first color region and the second color region, each of the plurality of candidate border locations being determined by applying a corresponding border location method chosen from among a plurality of border location methods, choosing one method from among the plurality of border location methods as a preferred method, and determining a location of a border between the first color region and the second color region by designating one of the plurality of candidate border locations associated with the preferred method as the border. Also, an automated optical inspection device suitable for inspection of patterned articles.
126 Citations
19 Claims
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1. A system for identifying a surface defect in an image of an object, the image comprising a multiplicity of pixels, the system comprising:
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choosing a region in which a surface defect is to be identified;
subsampling the region thereby producing a subsampled image of the region;
analyzing the subsampling image and identifying therefrom a surface defect in the region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for identifying a surface defect in an image of an object, the image comprising a multiplicity of pixels, the system comprising:
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a region selector selecting a region of an image in which a surface defect is to be identified;
a subsample identifying a subset of pixels in the region and generating from the subset of pixels a subsampled image of the region; and
analyzing the subsampled image to identify a surface defect in the region. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. Apparatus for identifying a surface defect in a region of an image of an object, the image comprising a multiplicity of pixels, the apparatus comprising:
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a subsampling unit operative to subsample the region in accordance with a subsampling ratio, thus producing a subsampled image of the region;
a defect identification unit operative to identify a surface defect in the subsampled image; and
a correspondence unit operative to identify a surface defect in the region corresponding to the surface defect in the subsampled image.
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Specification