Measuring shape of glossy curved surface by using encoded grating illumination.

概要

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In this paper, a method is proposed for measuring 3D-shape of an object with glossy curved surfaces. The method uses a diffuse plane light source of grating pattern encoded by an M-sequence. A surface to be measured is placed closely to a reference plane which is far from the light source so that a point on the surface can be considered as a point on the reference plane. Then the surface normal vectors are obtained by corresponding points on the image plane to those on the source plane. In order to attain the correspondence, we use two images obtained in the case that the source lines for one image are perpendicular to those for another, and utilize a characteristic regularity of M-sequence. The determination of surface normal vectors allows us to reconstruct the surface. Experimental results to confirm the validity of the method are shown. The method is very simple both in obtaining image data and in processing the data: it requires only two images.
公益社団法人計測自動制御学会の論文