Patent ID: 8462357
Filing Date: 2013-06-11
Classification: G01B

Abstract:
1. A method of obtaining 3D surface data about a surface of an object, the method including: projecting at the object surface, along approximately a first optical axis, at least two two-dimensional (2D) images containing together at least two wavelength bands, each projected image including a first image axis and a second image axis, each of the at least two wavelength bands varying in intensity along the first image axis within at least one of the projected images, each of the at least two wavelength bands being projected at least twice; upon projecting each image on the object surface, generating a reflected image along approximately a second optical axis, the projected images being oriented so that the first image axis is not orthogonal to a plane defined by the first and the second optical axis; recording the reflected images to obtain sets of object data, each set being indicative of light intensity levels corresponding to a wavelength band within the reflected images; and comparing data from the sets of object data with data from sets of pre-recorded calibration data so as to obtain z-axis coordinates of a plurality of locations on the object surface, the sets of calibration data being obtained by projecting the images at a calibration reference surface for a plurality of known positions along the z-axis, the step of comparing including, for each location on the object surface: