Patent ID: 9418413
Filing Date: 2016-08-16
CPC Classification: G01N,G05B,G06T,Y02P

Claim Text:
1. A method for selecting an inspection recipe, the method comprises: obtaining an image of a structural element of the semiconductor device; calculating, by a processor, multiple types of distances between an image of the structural element and each of a plurality of reference images obtained by applying a plurality of inspection recipes; wherein the multiple types of distances are calculated by using different algorithms; wherein a calculation of the multiple types of distances by the distance calculator comprises calculating at least five distances out of a group consisting of: (i) a difference between gray level histograms, (ii) a rectilinear (LI) distance, (iii) Euclidian (L2) length, (iv) Chi-square distance, (v) Bhattacharyya distance, (vi) Wasserstein metric, (vii) Swain metric, and (viii) normalized correlation; wherein different inspection recipes of the plurality of inspection recipes are optimized for different conditions of the semiconductor device; wherein each reference image is associated with an inspection recipe before the obtaining of the image of the structural element; and automatically selecting, by the processor, at least one selected inspection recipe out of the plurality of inspection recipes based on values of the multiple types of distances.