Three dimensional measurement apparatus, control method for three dimensional measurement apparatus, and storage medium

A non-transitory computer-readable storage medium storing a computer program for causing a computer to execute the steps of a control method for a three dimensional measurement apparatus that measures a three-dimensional shape of a measurement object on the basis of an image obtained by capturing, by an image capturing unit the measurement object onto which a pattern is projected, the method comprising:

• compositing a first image and a second image of the measurement object respectively captured by the image capturing unit under a first imaging condition and a second imaging condition that is different from the first imaging condition, by changing a luminance pixel value for one or more pixels in the second image such that the luminance pixel value in the second image, obtained in a case where light of a second exposure amount larger than a first exposure amount is incident on the image capturing unit under the second imaging condition, becomes larger than a luminance pixel value in the first image, obtained in a case where light of the first exposure amount is incident on the image capturing unit under the first imaging condition to maintain a magnitude relationship of an exposure amount of light incident on the image capturing unit and a luminance pixel value in an image obtained by the image capturing unit between the first image and the changed second image;
• and
• measuring the three-dimensional shape of the measurement object using the composited image.