3-D POLYHEDRAL FACE COMPUTATION FROM 2 PERSPECTIVE VIEWS WITH THE AIDOF A CALIBRATION PLATE

The 3-D reconstruction of visible polyhedral faces from a pair of gene ral perspective views with the aid of a calibration plate is addressed . A polyhedron is placed on a planar calibration plate and two side vi ews of both the polyhedron and the calibration plate are taken. Throug h proper arrangements we may assume that in the two views a number of polyhedral edges lying on the calibration plate and the whole calibrat ion plate boundary are visible. We present an on-line camera calibrati on technique with the aid of the calibration plate and a two-stage pro cess to find the vertex/edge correspondences without encountering the ambiguity problem of the conventional epipolar line technique. Then we give a closed form solution to the 3-D polyhedral vertices visible in both images. We also describe other advantages of using our method fo r the 3-D polyhedron reconstruction. Experimental results show that th e obtained 3-D polyhedral vertex coordinates are rather accurate.