Measurement apparatus and method thereof

A method of measuring a three-dimensional shape of an object to be measured using a projection device which projects a pattern to measurement space, and an imaging device which captures the measurement space, the method comprising:

• using a processor to perform steps of:
• obtaining a plurality of captured images from the imaging device, wherein the plurality of captured images represent patterns projected in a time series by the projection device, each pattern comprises a plurality of dashed lines each of which has a predetermined width, a longitudinal direction of each dashed line is substantially perpendicular to a base line defined by a line segment connecting an optical center of the projection device and an optical center of the imaging device, and each dashed line repeats light and dark in the longitudinal direction;
• discriminating the plurality of dashed lines based on combinations of the light and dark in the plurality of captured images;
• detecting correspondences between projected coordinates of the plurality of dashed lines and image coordinates of the plurality of dashed lines based on information regarding the patterns and a discrimination result of the plurality of dashed lines;
• and
• calculating the three-dimensional shape of the object based on the correspondences, and calibration data of the projection device and the imaging device.

A non-transitory computer readable medium storing a computer-executable program for causing a computer to perform a method of measuring a three-dimensional shape of an object to be measured using a projection device which projects a pattern to measurement space, and an imaging device which captures the measurement space, the method comprising:

• obtaining a plurality of captured images from the imaging device, wherein the plurality of captured images represent patterns projected in a time series by the projection device, each pattern comprises a plurality of dashed lines each of which has a predetermined width, a longitudinal direction of each dashed line is substantially perpendicular to a base line defined by a line segment connecting an optical center of the projection device and an optical center of the imaging device, and each dashed line repeats light and dark in the longitudinal direction;
• discriminating the plurality of dashed lines based on combinations of the light and dark in the plurality of captured images;
• detecting correspondences between projected coordinates of the plurality of dashed lines and image coordinates of the plurality of dashed lines based on information regarding the patterns and a discrimination result of the plurality of dashed lines;
• and
• calculating the three-dimensional shape of the object based on the correspondences, and calibration data of the projection device and the imaging device.