Silhouette-based 3d reconstruction by energy minimization

Mengi, Emre
To generate a model of an object in the framework of silhouette based recon struction from multiple views, various energy minimization techniques with dif ferent surface representations are used. Initially, original 3D snakes with layered parametric representation is applied. Snake is deformed to minimize an energy functional imposing smoothness and attraction towards 3D surface points de tected from 2D images. Secondly, a representation in spherical coordinates is suggested and the definition of the energy functional is modified accordingly. Together with this new representation the deformation technique of original 3D snakes is changed so that the surface discontinuities can be determined while de forming the surface. Finally, an iterative and progressive algorithm is described to reconstruct most of the natural surfaces. The progressive algorithm can be directly used for 3D reconstruction, if the data is reliable. In the case of noisy data, we discuss how the progressive method can be supplemented by an energy minimization technique in order to recover the surface accurately.


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Sahillioğlu, Yusuf; Yemez, Y. (2010-03-01)
We present a coarse-to-fine surface reconstruction method based on mesh deformation to build watertight surface models of complex objects from their silhouettes and range data. The deformable mesh, which initially represents the object visual hull, is iteratively displaced towards the triangulated range surface using the line-of-sight information. Each iteration of the deformation algorithm involves smoothing and restructuring operations to regularize the surface evolution process. We define a non-shrinking...
Cartesian Grid Mapper: Transformation Media for Modeling Arbitrary Curved Boundaries With Cartesian Grids
ÖZGÜN, ÖZLEM; Kuzuoğlu, Mustafa (2014-01-01)
A transformation electromagnetics-based approach is presented to facilitate the use of fixed Cartesian grids for modeling arbitrarily shaped (convex or nonconvex) curved boundaries in finite methods. The basic idea is to design transformation media adapted to the Cartesian grid by using the duality between the material parameters of the media and the coordinate transformation that maps the points of the Cartesian grid to the points on the original curved boundary. Such a transformation medium is named Carte...
Shape from silhouette using topology-adaptive mesh deformation
Yemez, Y.; Sahillioğlu, Yusuf (2009-10-01)
We present a computationally efficient and robust shape from silhouette method based on topology-adaptive mesh deformation, which can produce accurate, smooth, and topologically consistent 3D mesh models of complex real objects. The deformation scheme is based on the conventional snake model coupled with local mesh transform operations that control the resolution and uniformity of the deformable mesh. Based on minimum and maximum edge length constraints imposed on the mesh, we describe a fast collision dete...
Appearance reconstruction of three dimensional models from real images
Yilmaz, U; Mulayim, AY; Atalay, Mehmet Volkan (2002-10-30)
An image based model reconstruction system is described. Real images of a rigid object acquired under a simple but controlled environment are used to recover the three dimensional geometry and the surface appearance. Based on a multi-image calibration method, an algorithm to extract the rotation axis of a turn-table has been developed. Furthermore, this can be extended to estimate robustly the initial bounding volume of the object to be modeled. The coarse volume obtained, is then carved using a stereo corr...
AKTIHANOGLU, M; OZGUC, B; AYKANAT, C (Springer Science and Business Media LLC, 1994-01-01)
This paper describes a system for modeling, animating, previewing and rendering articulated objects. The system has a modeler of objects that consists of joints and segments. The animator interactively positions the articulated object in its stick, control vertex, or rectangular prism representation and previews the motion in real time. Then the data representing the motion and the models is sent to a multicomputer [iPSC/2 Hypercube (Intel)]. The frames are rendered in parallel, exploiting the coherence bet...
Citation Formats
E. Mengi, “Silhouette-based 3d reconstruction by energy minimization ,” M.S. - Master of Science, Middle East Technical University, 2003.