Patent ID: 11927435
Assignee: CKD CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. A three-dimensional measurement device that performs three-dimensional measurement of a measured object using a phase shift method, the three-dimensional measurement device comprising:
an irradiator that irradiates the measured object with a predetermined light pattern having a light intensity distribution in a fringe shape;
a control device that shifts a phase of the light pattern radiated from the irradiator by 90 degrees in four different ways; and
an imaging device that takes an image of the measured object irradiated with the light pattern, wherein
the control device executes three-dimensional measurement of the measured object by the phase shift method based on four different image data taken under the light pattern having the phase shifted in the four different ways,
the control device executes the three-dimensional measurement by:
obtaining four luminance values with respect to a predetermined coordinate position on the image data based on the four different image data;
extracting three or more luminance values that are neither overexposed nor underexposed from among the four luminance values; and
executing height measurement at the predetermined coordinate position based on the three or more luminance values.