Calibration software for surface reconstruction of small objects
AssigneeGeneral Electric Company
InventorsVictor Nzomigni, Donald Wagner Hamilton, James Vradenburg Miller, Peter Henry Tu, Glen William Brooksby
Life of this patent
Estimating the term…
Abstract
A method for determining the axis of rotation (AR) of an object (12) mounted to a rotary stage or platform (10) in a gauge measurement system by estimating a transformation (δ) between multiple views or measurements of the object (12) obtained at different poses.
Claims16
A method for determining an axis of rotation of a rotary stage upon which an object is rigidly mounted in a measurement system, comprising:
- for each of a plurality of poses of said object incrementally rotated about said axis of rotation, obtaining a set measurements representative of said pose;
- estimating, from sequential pairs of said sets of measurements, a rigid body transformation for the incremental rotation between each of said plurality of poses;
- decomposing said estimated rigid body transformation into an estimated rotation value and an estimated translation value;
- and
- estimating the axis of rotation from said rotation value and said translation value.
A method for determining an axis of rotation of a rotary stage upon which object is rigidly mounted in a measurement system, comprising:
- for each of a plurality of poses of said object incrementally rotated about said axis of rotation, obtaining a set measurements representative of said pose;
- estimating, from sequential pairs of said sets of measurements, a rigid body transformation for the incremental rotation between each of said plurality of poses;
- decomposing said estimated rigid body transformation into an estimated rotation value and an estimated translation value;
- computing a rotation for a point from a coordinate system defined relative to said measurement system to a coordinate system defined relative to said rotary stage;
- utilizing said estimated rotation value and said estimated translation value to identify a point on said axis of rotation in said rotary stage coordinate system;
- and
- utilizing said rotation to represent said identified point in said measurement system coordinate system.
A method for determining an axis of rotation of a rotary stage upon which object is rigidly mounted in a measurement system, comprising:
- for each of a plurality of poses of said object incrementally rotated about said axis of rotation, obtaining at least one measurement representative of said pose;
- estimating, from at least one sequential pair of said sets of measurements, a rigid body transformation for the incremental rotation between each of said plurality of poses;
- establishing a matrix from said rigid body transformation;
- and
- identifying two eigenvectors having eigenvalues equal to +1 within said established matrix, each of said eigenvectors representing a point invariant to said rigid body transformation.
Dependencies are inferred from the claim text.