Patent ID: 11935244
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A non-transitory computer-readable storage medium having stored thereon computer-executable instructions which, when being executed by a computer, cause the computer to execute a method for improving sensitivity of wafer detection, the method comprising:
acquiring a gray-scale image of a peripheral circuit region of a wafer;
dividing the gray-scale image into at least one pixel region;
determining a repeated image region in each of the at least one pixel region, wherein the repeated image region is a region with N*M pixels, where M pixels on a same column in the repeated image region have a same gray-scale value, and N and M are integers greater than 0;
performing Fourier analysis on all repeated image regions in the gray-scale image to determine position information where interference superposition occurs in the peripheral circuit region of the wafer according to all the repeated image regions in the gray-scale image; and
processing the interference superposition according to the position information to obtain a wafer defect.