Patent ID: 7565032
Filing Date: 2009-07-21
Classification: G03F,G06T

Abstract:
1. A device for correcting a pattern image by use of an inspection reference pattern image of a workpiece being tested and a pattern image under test, said device comprising: an equation generation unit operative to generate by linear predictive modeling a set of simultaneous equations for the reference pattern image and the under-test pattern image; a parameter generation unit operative to solve the equations to thereby obtain model parameters; a parameter sum calculation unit operative to obtain a total sum of model parameters; a sub-pixel interpolation computing unit operative to perform interpolation against the reference pattern image and the test pattern image to thereby generate a sub-pixel interpolated image; a sub-pixel shift amount generation unit operative to use the sub-pixel interpolated image to obtain a sub-pixel shift amount for minimization of a deviation error in position between the reference pattern image and the test pattern image; an error comparison unit operative to compare the parameter sum and a threshold; a corrected pattern image generation unit operative to use the model parameter to generate a corrected pattern image based on the linear predictive modeling; and an interpolated image correction unit operative to generate an interpolated corrected image based on interpolation processing.