Method of detecting defects in semiconductor package leads
First Claim
1. A method of detecting defects in leads of a semiconductor package comprising:
- providing a first semiconductor package having a first conductive line;
acquiring a first grey level image of the first conductive line;
providing a second semiconductor package having a second conductive line;
acquiring a second grey level image of the second conductive line;
converting the first grey level image to a first edge feature image;
converting the second grey level image to a second edge feature image;
skeletonizing the first edge feature image to form a first skeletonized image;
dilating the second edge feature image to form a first dilated image;
comparing the first skeletonized image to the first dilated image;
detecting shapes in the first skeletonized image that are not contained within the first dilated image;
skeletonizing the second edge feature image to form a second skeletonized image;
dilating the first edge feature image to form a second dilated image;
comparing the second skeletonized image to the second dilated image; and
detecting shapes in the second skeletonized image that are not contained within the second dilated image.
4 Assignments
0 Petitions
Accused Products
Abstract
A method of detecting defects (14, 16, 17, 44, 47, 49, and 51) in objects is presented. A first grey level image (18) of a first object (10) is formed and a second grey level image (19) of a second object (12) is formed. The first (18) and second (19) grey level images are converted to a first (21) and a second (22) edge feature image, respectively. The first edge feature image is dilated (26) and the second edge feature image is skeletonized (27). The dilated (26) and skeletonized images (27) are compared. An alternate method includes forming a grey level image (40) of an object. A principal axis of the grey level image is identified, and a shifted grey level image is formed by shifting the grey level image a distance along the principal axis. The grey level image (40) is then compared to the shifted grey level image.
-
Citations
11 Claims
-
1. A method of detecting defects in leads of a semiconductor package comprising:
-
providing a first semiconductor package having a first conductive line; acquiring a first grey level image of the first conductive line; providing a second semiconductor package having a second conductive line; acquiring a second grey level image of the second conductive line; converting the first grey level image to a first edge feature image; converting the second grey level image to a second edge feature image; skeletonizing the first edge feature image to form a first skeletonized image; dilating the second edge feature image to form a first dilated image; comparing the first skeletonized image to the first dilated image; detecting shapes in the first skeletonized image that are not contained within the first dilated image; skeletonizing the second edge feature image to form a second skeletonized image; dilating the first edge feature image to form a second dilated image; comparing the second skeletonized image to the second dilated image; and detecting shapes in the second skeletonized image that are not contained within the second dilated image. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method of detecting defects in an object comprising:
-
converting a first grey level image of a first object to a first edge feature image; converting a second grey level image of a second object to a second edge feature image; skeletonizing the first edge feature image to form a first skeletonized image; dilating the second edge feature image to form a first dilated image; comparing the first skeletonized image to the first dilated image; skeletonizing the second edge feature image to form a second skeletonized image; dilating the first edge feature image to form a second dilated image; comparing the second skeletonized image to the second dilated image; and detecting shapes in the first skeletonized image that are not contained within the first dilated image. - View Dependent Claims (8, 9, 10, 11)
-
Specification