Patent ID: 9739605
Date: 2017-08-22
CPC Classifications: G01B,G01N,G06K

Claim:
1. A method of measuring a three dimensional shape comprising: illuminating grating pattern lights in a plurality of directions onto a measurement target by N times and acquiring N pattern images reflected from the measurement target with respect to each direction, wherein a plurality of pattern-projecting sections disposed in the plurality of directions illuminates the grating pattern lights in the plurality of directions; extracting a phase with respect to each direction, corresponding to each position from the N pattern images; extracting N brightness degrees from the N pattern images with respect to each direction, corresponding to each position: averaging the N brightness degrees with respect to each direction to obtain an average brightness with respect to each direction, corresponding to each position; extracting a height weight with respect to each direction by using a weight function employing the average brightness as a parameter; calculating a weight height with respect to each direction by using a height based on the phase and the height weight; and calculating a height at each position by using weight heights with respect to the plurality of directions associated with the plurality of pattern-projecting sections.