Patent ID: 11921825
Assignee: KLA CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A system, comprising:
a controller communicatively coupled to one or more through-focus imaging metrology sub-systems, wherein the controller includes one or more processors configured to execute a set of program instructions stored in memory, and wherein the set of program instructions is configured to cause the one or more processors to:
receive a plurality of training images captured at one or more focal positions, one or more of the training images including one or more training features of a training specimen;
generate a machine learning classifier based on the plurality of training images captured at the one or more focal positions;
receive one or more target feature selections for one or more target overlay measurements corresponding to one or more target features of a target specimen;
determine one or more target focal positions based on the one or more target feature selections using the machine learning classifier;
receive one or more target images captured at the one or more target focal positions, the one or more target images including the one or more target features of the target specimen; and
determine one or more overlay measurements based on the one or more target images.