Three-dimensional shape measuring apparatus, three-dimensional shape measuring method, and storage medium

A three-dimensional shape measuring method comprising:

• a step of projecting a stripe pattern whose luminance changes periodically onto a measurement-target object;
• a step of acquiring a captured image of the stripe pattern by capturing images of the measurement-target object from a plurality of directions under a plurality of exposure conditions at a time at which the stripe pattern is projected;
• a step of projecting a reference position pattern indicating a position of at least one period of a plurality of periods of the stripe pattern as a reference position onto the measurement-target object;
• a step of acquiring a captured image of the reference position pattern by capturing images of the measurement-target object from the plurality of directions under one exposure condition at a time at which the reference position pattern is projected;
• and
• a step of calculating a three-dimensional shape of the measurement-target object based on a captured image of the stripe pattern and a captured image of the reference position pattern.

A non-transitory computer readable storage medium storing a program for causing a computer to function as a three-dimensional shape measuring apparatus, the three-dimensional shape measuring apparatus comprising:

• a projection unit configured to project a stripe pattern whose luminance changes periodically and a reference position pattern indicating a position of at least one period of a plurality of periods of the stripe pattern as a reference position onto a measurement-target object;
• an image capturing unit configured to capture images of the measurement-target object from a plurality of directions;
• a control unit configured to control the projection unit and the image capturing unit, to acquire a captured image of the stripe pattern by performing control so that the image capturing unit captures images of the measurement-target object from the plurality of directions under a plurality of exposure conditions at a time at which the stripe pattern is projected, and to acquire a captured image of the reference position pattern by performing control so that the image capturing unit captures images of the measurement-target object from the plurality of directions under one exposure condition at a time at which the reference position pattern is projected;
• and
• a shape calculation unit configured to calculate a three-dimensional shape of the measurement-target object based on a captured image of the stripe pattern and a captured image of the reference position pattern.