Patent ID: 8041103
Filing Date: 2011-10-18
Classification: G06F,G06T,H01L

Abstract:
1. A computer-implemented method for determining a position of inspection data in design data space, comprising: using a computer system to performing the following steps: determining a centroid of an alignment target formed on a wafer using an image of the alignment target acquired by imaging the wafer, wherein determining the centroid of the alignment target comprises determining a cross correlation between an edge profile for a first edge of the alignment target and a mirrored edge profile for a second edge of the alignment target opposite to the first edge, determining a peak of the cross correlation, and determining a mid-point between the first and second edges using a position of the peak and sizes of the edge profiles; aligning the centroid to a centroid of a geometrical shape describing the alignment target; assigning a design data space position of the centroid of the alignment target as a position of the centroid of the geometrical shape in the design data space; and determining a position of inspection data acquired for the wafer in the design data space based on the design data space position of the centroid of the alignment target.