Reduction of false alarms in PCB inspection
First Claim
1. A method for automatically optically inspecting an electrical circuit, comprising:
- acquiring at least one non-binary optical image of an electrical circuit;
generating at least one binary first inspection image from the at least one non-binary optical image and processing said binary first inspection image to determine therefrom regions of candidate defects in the electrical circuit;
generating at least one additional inspection image, from said at least one non-binary optical image, for regions surrounding candidate defects, said at least one additional inspection image at least partially including information for an optical characteristic that is not included in the at least one binary first inspection image; and
determining whether the candidate defect is a specious defect by inspecting the at least one additional inspection image.
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Accused Products
Abstract
A method for automatically optically inspecting an electrical circuit (12), comprising: acquiring at least one optical image of an electrical circuit (12); generating at least one first inspection image from the at least one image and determining regions of candidate defects (236) therefrom; generating at least one additional inspection image for regions surrounding candidate defects (236), said at least one additional inspection image at least partially including optical information not included in the at least one first inspection image; and determining whether the candidate defect (236) is a specious defect by inspecting the at least one additional inspection image.
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Citations
29 Claims
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1. A method for automatically optically inspecting an electrical circuit, comprising:
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acquiring at least one non-binary optical image of an electrical circuit; generating at least one binary first inspection image from the at least one non-binary optical image and processing said binary first inspection image to determine therefrom regions of candidate defects in the electrical circuit; generating at least one additional inspection image, from said at least one non-binary optical image, for regions surrounding candidate defects, said at least one additional inspection image at least partially including information for an optical characteristic that is not included in the at least one binary first inspection image; and determining whether the candidate defect is a specious defect by inspecting the at least one additional inspection image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of inspecting an electrical circuit, comprising:
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acquiring a non-binary image of an electrical circuit; processing said non-binary image to derive a binary representation of said electrical circuit; determining the presence of a candidate defect in the electrical circuit at least in part from analyzing the binary representation; defining a portion of said non-binary image corresponding to a region surrounding said candidate defect; and determining the presence of an actual defect in the electrical circuit from analyzing said portion of the non-binary image. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. Apparatus for automatically optically inspecting electrical circuits, comprising:
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at least one optical sensor operative to acquire a non-binary image of an electrical circuit; a first image processor operative to generate a binary representation of the electrical circuit from the non-binary image and to analyze said binary representation to determine therefrom suspected defects in the electrical circuit; a snapshot generator operative to receive said non-binary image from the at least one optical sensor, and reports of suspected defects from the first image processor, and to generate non-binary neighborhood images defining regions surrounding suspected defects; and an image post processor operative to analyze the non-binary neighborhood images and to determine therefrom the presence of real defects. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification