Patent ID: 9275292
Filing Date: 2016-03-01
CPC Classification: G01B,G01N,G06K

Claim Text:
1. A method of measuring a three dimensional shape comprising: illuminating grating pattern lights in a plurality of directions onto a measurement target while changing each of the grating pattern lights by N times and detecting the grating pattern lights reflected by the measurement target, to acquire N pattern images of the measurement target with respect to each direction; extracting a phase, a brightness and a visibility with respect to each direction corresponding to each position from the pattern images; extracting a height weight with respect to each direction by using a weight function employing the brightness and the visibility as a parameter; calculating a weight height with respect to each direction by using a height based on the phase with respect to each direction and the height weight; and calculating a height at each position by using weight heights with respect to the plurality of directions, wherein the visibility is an amplitude of brightness signal divided by an average brightness.