Patent ID: 9454818
Filing Date: 2016-09-27
CPC Classification: G01B,G01S,G02B,G06K,G06T

Claim Text:
1. A method for determining three orientational degrees of freedom of a retroreflector comprising: obtaining on a two-dimensional photosensitive array an image of a first straight mark, a second straight mark, and a third straight mark on the retroreflector that has three mutually perpendicular reflecting surfaces; receiving by a programmable control device a two-dimensional digital array representation of the image; performing with the programmable control device a two-dimensional transform of the two-dimensional digital array to obtain coefficients of sinusoidal basis functions as a first transformed array; determining by the programmable control device the three orientational degrees of freedom based at least in part on the first transformed array; and storing the determined three orientational degrees of freedom.