Patent ID: 9747520
Date: 2017-08-29
CPC Classifications: G03F,G06K,G06T,H04N

Claim:
1. A method for identifying defects in a wafer with an inspection tool comprising: capturing, using an electronic image capture device of the inspection tool, a grayscale image set of the wafer by: storing the grayscale image set into a computer-readable memory; determining, using a processor in communication with the computer-readable memory, a residual signal in each of the images of the grayscale image set based on a combination of the images in the grayscale image set; subtracting, using the processor, the residual signal of each image of the grayscale image set from each image of the grayscale image set; and identifying, using the processor, a defect in the wafer based on the subtracted grayscale image set.