Outlier detection on pattern of interest image populations
First Claim
1. A system configured to identify outliers in multiple instances of a pattern of interest on a specimen, comprising:
- an imaging subsystem comprising at least an energy source and a detector, wherein the energy source is configured to generate energy that is directed to a specimen, and wherein the detector is configured to detect energy from the specimen and to generate images responsive to the detected energy; and
one or more computer subsystems configured for;
acquiring images generated by the imaging subsystem at multiple instances of a pattern of interest within a die formed on the specimen, wherein the multiple instances comprise two or more instances that are located at aperiodic locations within the die;
determining a feature of each of the images generated at the multiple instances of the pattern of interest; and
identifying one or more outliers in the multiple instances of the pattern of interest based on the determined features.
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Abstract
Methods and systems for identifying outliers in multiple instances of a pattern of interest (POI) are provided. One system includes one or more computer subsystems configured for acquiring images generated by an imaging subsystem at multiple instances of a POI within a die formed on the specimen. The multiple instances include two or more instances that are located at aperiodic locations within the die. The computer subsystem(s) are also configured for determining a feature of each of the images generated at the multiple instances of the POI. In addition, the computer subsystem(s) are configured for identifying one or more outliers in the multiple instances of the POI based on the determined features.
39 Citations
30 Claims
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1. A system configured to identify outliers in multiple instances of a pattern of interest on a specimen, comprising:
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an imaging subsystem comprising at least an energy source and a detector, wherein the energy source is configured to generate energy that is directed to a specimen, and wherein the detector is configured to detect energy from the specimen and to generate images responsive to the detected energy; and one or more computer subsystems configured for; acquiring images generated by the imaging subsystem at multiple instances of a pattern of interest within a die formed on the specimen, wherein the multiple instances comprise two or more instances that are located at aperiodic locations within the die; determining a feature of each of the images generated at the multiple instances of the pattern of interest; and identifying one or more outliers in the multiple instances of the pattern of interest based on the determined features. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A non-transitory computer-readable medium, storing program instructions executable on a computer system for performing a computer-implemented method for identifying outliers in multiple instances of a pattern of interest on a specimen, wherein the computer-implemented method comprises:
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acquiring images generated by an imaging subsystem at multiple instances of a pattern of interest within a die formed on the specimen, wherein the multiple instances comprise two or more instances that are located at aperiodic locations within the die, wherein the imaging subsystem comprises at least an energy source and a detector, wherein the energy source is configured to generate energy that is directed to the specimen, and wherein the detector is configured to detect energy from the specimen and to generate images responsive to the detected energy; determining a feature of each of the images generated at the multiple instances of the pattern of interest; and identifying one or more outliers in the multiple instances of the pattern of interest based on the determined features, wherein said acquiring, said determining, and said identifying are performed by one or more computer subsystems.
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30. A computer-implemented method for identifying outliers in multiple instances of a pattern of interest, on a specimen, comprising:
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acquiring images generated by an imaging subsystem at multiple instances of a pattern of interest within a die formed on the specimen, wherein the multiple instances comprise two or more instances that are located at aperiodic locations within the die, wherein the imaging subsystem comprises at least an energy source and a detector, wherein the energy source is configured to generate energy that is directed to the specimen, and wherein the detector is configured to detect energy from the specimen and to generate images responsive to the detected energy; determining a feature of each of the images generated at the multiple instances of the pattern of interest; and identifying one or more outliers in the multiple instances of the pattern of interest based on the determined features, wherein said acquiring, said determining, and said identifying are performed by one or more computer subsystems.
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Specification