Approach to Accurate Photorealistic Model Generation for Complex 3d Objects

Due to the progress in computers and sensors development the number of virtual reality application (VR) grows significantly. Different sensors and techniques such as laser range finders, still and video cameras, mechanical digitizers are used to obtain spatial object coordinates for producing 3D models. The two main requirements to the produced model are the accurate geometry reconstruction and the realistic texture generation. The means of digital close-range photogrammetry are quite enough to satisfy those requirements. The same images can be used as for accurate 3Dgeometry reconstruction as for adequate photometry modeling generation of realistic object texture. The close-range photogrammetry technique for accurate geometric and texturing modeling is well-developed for 2.5D (depth) object models. But for complex 3D objects that have no single valued plane projection there are some problems with surface reconstruction and texture generation. In this case uniform surface can not be reconstructed by traditionally used Delaunay triangulation procedure for all points of objects. So the orthophoto can not be generated because of surface singularity. The paper considers the approaches for these problems solution. It describes the method for reconstruction of the uniform surface for some classes of complex 3D objects represented in form of object space coordinates cloud. Also the method for accurate texture generation from a set of object images obtained from various viewpoints is presented. The results of object reconstruction and texturing are given along with the description of developed close-range photogrammetric system.