Patent Document ID: 20070222979
Application ID: 10590352
Patent Flag: 0

Claim One:
1. A method for determining at least one process parameter, the method comprising: obtaining calibration measurement data from a plurality of calibration marker structure sets provided on a calibration object, each of said plurality of calibration marker structure sets comprising at least one calibration marker structure, calibration marker structures of different calibration marker structure sets being created using different known values of said at least one process parameter; determining a mathematical model by using said known values of said at least one process parameter and by employing a regression technique on said calibration measurement data, said mathematical model comprising a number of regression coefficients; obtaining measurement data from at least one marker structure provided on an object, said at least one marker structure being made using an unknown value of said at least one process parameter; and determining the unknown value of said at least one process parameter for said object from said obtained measurement data by employing said regression coefficients of said mathematical model.