System and method for selection of a reference die
First Claim
Patent Images
1. A system for selection of a reference die image comprising:
- a die image comparator operable to create a difference image based upon a first die image and a second die image; and
a difference image analysis system coupled to the die image comparator, the difference image analysis system operable to analyze the difference image and to determine whether the first die image and the second die image may each be used as the reference die image.
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Abstract
A system for selecting reference die images, such as for use with a visual die inspection system, is provided. The system includes a die image comparator, which compares a first die image to a second die image in order to create a difference image that contains only the differences between the two die images. The system also includes a difference image analysis system that receives data from the die image comparator. The difference image analysis system analyzes the difference image and determines whether there are any features of the difference image that indicate that either the first die image or the second die image should not be used as a reference die image.
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Citations
26 Claims
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1. A system for selection of a reference die image comprising:
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a die image comparator operable to create a difference image based upon a first die image and a second die image; and
a difference image analysis system coupled to the die image comparator, the difference image analysis system operable to analyze the difference image and to determine whether the first die image and the second die image may each be used as the reference die image. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for inspecting dies comprising:
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a camera configured to obtain an image of one or more dies; and
a reference die detection system coupled to the camera, the reference die detection system operable to determine whether a first die image and a second die image may be used as reference images. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for selecting a reference die image comprising:
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subtracting a first die image from a second die image to create a difference image; and
determining whether the difference image contains unacceptable data. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification