Patent ID: 9354046
Filing Date: 2016-05-31
CPC Classification: G01B,G06K,G06T,H04N

Claim Text:
1. A three dimensional shape measurement apparatus comprising: a projection unit configured to project a stripe pattern including a light portion and a bright portion to a measurement area; a photographing unit configured to photograph a target object in the measurement area while the stripe pattern is projected by the projection unit, wherein the photographing unit has single image sensing element and single focus position; a detection unit configured to detect an edge position representing a boundary between a light portion and a dark portion based on an image photographed by the photographing unit; and a measurement unit configured to measure a three dimensional shape of the target object based on the edge position detected by the detection unit, wherein a focus position of the photographing unit is set deeper than an intersection between an axis going through a center of a projection range of the projection unit and an axis going through a center of a photographing range of the photographing unit, when observed from the photographing unit, wherein a focus position of the projection unit is set not shallower than the intersection between the axis going through the center of the projection range of the projection unit and the axis going through the center of the photographing range of the photographing unit, when observed from the projection unit, and wherein a contrast value between the light portion and the dark portion in the image photographed by the photographing unit has a maximum value in an area deeper than the intersection, when observed from the photographing unit.