Patent ID: 8675077
Filing Date: 2014-03-18
Classification: G03B,G06T,H04N

Abstract:
1. A method of concurrently determining six degrees of freedom in position and orientation and resolution of an imaging array in at least one direction relative to a reference frame, the method comprising: projecting an image of each of at least three mask patterns on the imaging array, said at least three mask patterns being formed on a first mask and comprising resolution measurement patterns; computing a first coordinate position of the imaging array relative to the reference frame using pixel positions of the images along a first axis; computing a second coordinate position of the imaging array relative to the reference frame using pixel positions of the images along a second axis; computing a first rotational position of the imaging array about a third coordinate axis using pixel positions of the images along the first and second axes and distances between the mask patterns along the first and second coordinates; providing a focus image of each of the at least three mask patterns on the imaging array, said focus image of each mask pattern being characterized by an associated distance along a third axis between the mask pattern and the imaging array; computing a second rotational position of the imaging array about a first coordinate axis using feature widths of the focus images and the distance between the mask patterns along the second coordinate axis; computing a third rotational position of the imaging array about a second coordinate axis using the feature widths of the focus images and the distance between the mask patterns along the first coordinate axis; and measuring resolution of the imaging array.