Method and apparatus for detecting defects using structured light
AssigneeElectro Scientific Industries, Inc.
InventorsLeo Baldwin, Joseph J. Emery
Life of this patent
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Abstract
An improved method and apparatus for detecting problems with fit and finish of manufactured articles is presented which uses structured light. Two or more structured light images acquired from opposing directions is used to measure the fit of mating surfaces while avoiding false positives caused by small defects near the seam.
Claims12
An improved method for classifying defects in an article, including projecting light patterns onto said article, acquiring images of said projected pattern, transmitting said images to a computer, and processing said images with said computer, the improvement comprising:
- projecting a first light pattern onto said article from a first direction;
- acquiring a first image of said first light pattern with an image sensor;
- transmitting said first image from said sensor to said computer;
- projecting a second light pattern onto said article from a second direction;
- acquiring a second image of said second pattern with an image sensor;
- transmitting said second image from said image sensor to said computer;
- and
- processing said first and second images with said computer to detect differences between the images and thereby classify defects in the article,
- wherein acquiring the first image includes acquiring an image of the first light pattern projected onto the article and reflected by the article along a third direction relative to a location on the article,
- wherein acquiring the second image includes acquiring an image of the second light pattern projected onto the article and reflected by the article along a fourth direction relative to the location on the article, and
- wherein the third direction is different from the fourth direction.
An improved method for classifying defects in an article, including projecting light patterns onto said article, acquiring images of said projected pattern with an image sensor, transmitting said images to a computer, and processing said images with said computer, the improvement comprising:
- projecting a light pattern onto said article and acquiring a first image of said light pattern with an image sensor;
- transmitting said first image from said image sensor to said computer;
- rotating said article;
- projecting said light pattern onto said rotated article and acquiring a second image of said light pattern with said image sensor;
- transmitting said second image from said image sensor to said computer;
- and
- processing said first and second images with said computer to detect differences between the images and thereby classify defects in the article.
An improved system for classifying defects in an article with projected light patterns, image sensors and computers, the improvement comprising:
- first and second patterned light projectors arranged adjacent to different portions of the article to project light patterns onto substantially the same location on said article from different directions;
- first and second image sensors arranged to acquire first and second images of said projected light patterns from different directions;
- and
- a computer communicating with first and second image sensors to process the acquired first and second images to detect differences between the first and second images and thereby classify defects.
Dependencies are inferred from the claim text.