OBTAINING BASE EDGE CORRESPONDENCE IN STEREO IMAGES VIA QUANTITATIVE MEASURES ALONG C-DIAGONALS

We propose a novel approach to solving the object edge correspondence problem for stereo images. For an object placed on a calibration plate (C-plate), the proposed approach first obtains the correspondences of the object edges lying on the C-plate (the base edges) via quantitati ve measures of locations of the intersections of the extended line of the edges and the diagonals of the C-plate (C-diagonals) using cross r atios. The measures an viewpoint invariant for an object base edge, an d are expressed in the number of image pixels. Special cases which nee d only coarse calculations, as well as those which require extra measu res for additional point features, are also considered, The proposed a pproach requires 2-D image data only, and is robust in the presence of errors in the feature detection. Experimental results are presented f or polyhedral and curved objects to demonstrate the effectiveness of t he proposed approach. (C) 1997 Elsevier Science B.V.