Patent ID: 8233157
Filing Date: 2012-07-31
Classification: G01B,G06T

Abstract:
1. An apparatus for determining at least a dimension of an object having a three-dimensional (3D) geometry, said apparatus comprising: an imaging system configured to acquire an image of said object wherein said acquired image includes object boundaries representing a two-dimensional (2D) projection of the 3D object geometry; a parameter identifier configured to determine at least one calibration parameter; and a computing unit configured to determine said dimension of said object from said image using said at least one calibration parameter, wherein said computing unit further includes means for adjusting said at least one calibration parameter to correct for misalignment, said adjusting means being configured to convert said acquired image into a corrected image based on at least (i) said object boundaries in said acquired image and (ii) a predetermined, desired relationship that the object boundaries should have in the absence of misalignment between said apparatus and said object, said computing unit being further configured to determine said dimension using said corrected image.