Patent ID: 8693007
Filing Date: 2014-04-08
Classification: G01B,G06T

Abstract:
1. A device for measuring three dimensional shape comprising: a first irradiation unit configured to irradiate a first light pattern of a first pitch and having a striped light intensity distribution from a first position upon a object to be measured; a second irradiation unit configured to irradiate a second light pattern of a second pitch and having a striped light intensity distribution from a second position upon a object to be measured, the second pitch being longer than the first pitch, and the second position being different from the first position; an imaging unit configured to image the object to be measured irradiated by the light patterns; and an image processing unit configured to perform three dimensional measurement based on an image data imaged by the imaging unit; wherein the imaging processing unit comprises: a first measurement value acquisition unit configured to perform three dimensional measurement by the phase shift method based on a multiplicity of image data obtained by multiply irradiating the first light pattern using multiple different phases and by the imaging by the imaging unit, and to acquire as a first measurement value the measurement value obtained by the three dimensional measurement of the first measurement value acquisition unit; a second measurement value acquisition unit configured to perform three dimensional measurement by the phase shift method based on a multiplicity of image data obtained by multiply irradiating the second light pattern using multiple different phases and by the imaging by the imaging unit, and to acquire as a second measurement value the measurement value obtained by the three dimensional measurement of the second measurement value acquisition unit; a first height data acquisition unit configured to acquire a height data specified from the first measurement value and the second measurement value relating to an entirely irradiated region irradiated by the first light pattern and the second light pattern, and to use the acquired specified height data as a height data for the entirely irradiated region; a supplemental data acquisition unit configured to acquire, based on the height data for the entirely irradiated region, a supplemental data relating to a partially irradiated region that is irradiated by only the first light pattern or the second light pattern; and a second height acquisition unit configured to specify a fringe order of the first measurement value or the second measurement value for the partially irradiated region based on the supplemental data, and to acquire as height data for the partially irradiated region a height data corresponding to the first measurement value or the second measurement value of the fringe order that was specified, wherein, as seen in a planar view looking along the imaging direction (approximately vertical direction) of the imaging unit, the first irradiation unit and the second irradiation unit are opposingly disposed at positions so as to sandwich the object to be measured therebetween.