Patent Document ID: 8098926
Application ID: 11971209
Patent Status: 1

Claim One:
1. A method for evaluating an evaluated pattern of a mask, the method comprising: simulating a plurality of alterations of a nominal pattern to provide a plurality of altered patterns; calculating a plurality of groups of moments; each group of moments representing an image of an altered pattern out of the plurality of altered patterns; determining a plurality of relationships; each relationship linking differences between the nominal pattern and an altered pattern and differences between the multiple nominal moments and a group of moments that represent the image of the altered pattern; determining the mapping function in response to at least one relationship out of the plurality of relationships; receiving or calculating, using the mapping function, multiple moments that represent an image of the evaluated pattern; wherein a size of information required for representing the multiple moments is substantially smaller than a size of pixel information that form the image of the evaluated pattern; and processing the multiple moments in order to determine at least one shape parameter of the evaluated pattern.