Methods and Systems for Detecting Defects on a Specimen Using a Combination of Bright Field Channel Data and Dark Field Channel Data
First Claim
1. A computer-implemented method for detecting defects on a specimen, comprising:
- combining pixel-level data acquired for the specimen by a bright field channel and a dark field channel of an inspection system; and
detecting defects on the specimen by applying a two-dimensional threshold to the combined data, wherein the two-dimensional threshold is defined as a function of a threshold for the data acquired by the bright field channel and a threshold for the data acquired by the dark field channel.
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Abstract
Various methods, carrier media, and systems for detecting defects on a specimen using a combination of bright field channel data and dark field channel data are provided. One computer-implemented method includes combining pixel-level data acquired for the specimen by a bright field channel and a dark field channel of an inspection system. The method also includes detecting defects on the specimen by applying a two-dimensional threshold to the combined data. The two-dimensional threshold is defined as a function of a threshold for the data acquired by the bright field channel and a threshold for the data acquired by the dark field channel.
34 Citations
22 Claims
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1. A computer-implemented method for detecting defects on a specimen, comprising:
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combining pixel-level data acquired for the specimen by a bright field channel and a dark field channel of an inspection system; and detecting defects on the specimen by applying a two-dimensional threshold to the combined data, wherein the two-dimensional threshold is defined as a function of a threshold for the data acquired by the bright field channel and a threshold for the data acquired by the dark field channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A carrier medium, comprising program instructions executable on a computer system for performing a method for detecting defects on a specimen, wherein the method comprises:
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combining pixel-level data acquired for the specimen by a bright field channel and a dark field channel of an inspection system; and detecting defects on the specimen by applying a two-dimensional threshold to the combined data, wherein the two-dimensional threshold is defined as a function of a threshold for the data acquired by the bright field channel and a threshold for the data acquired by the dark field channel.
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22. A system configured to detect defects on a specimen, comprising:
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an inspection system comprising a bright field channel and a dark field channel, wherein the bright field channel and the dark field channel are configured to acquire pixel-level data for the specimen; and a processor configured to; combine the pixel-level data acquired for the specimen by the bright field channel and the dark field channel; and detect defects on the specimen by applying a two-dimensional threshold to the combined data, wherein the two-dimensional threshold is defined as a function of a threshold for the data acquired by the bright field channel and a threshold for the data acquired by the dark field channel.
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Specification