ABSTRACT
This paper introduces a region-of-interest visual hull refinement technique, based on flexible voxel grids for volumetric visual hull reconstructions. Region-of-interest refinement is based on a multi-pass process, beginning with a focussed visual hull reconstruction, resulting in a first 3D approximation of the target, followed by a region-of-interest estimation, tasked with identifying features of interest, which in turn are used to locally refine the voxel grid and extract a higher-resolution surface representation for those regions. This approach is illustrated for the reconstruction of avatars for use in tele-immersion environments, where head and hand regions are of higher interest. To allow reproducability and direct comparison a publicly available data set for human visual hull reconstruction is used. This paper shows that region-of-interest reconstruction of the target is faster and visually comparable to higher resolution focused visual nhull reconstructions. This approach reduces the amount of data generated through the reconstruction, allowing faster post processing, as rendering or networking of the surface voxels. Reconstruction speeds support smooth interactions between the avatar and the virtual environment, while the improved resolution of its facial region and hands creates a higher-degree of immersion and potentially impacts the perception of body language, facial expressions and eye-to-eye contact.
- Gross, M., Wurmlin, S., Naef, M., Lamboray, E., Spagno, C., Kunz, A., Koller-Meier, E., Svoboda, T., Gool, L. V., Lang, S., Strehlke, K., Moere, A. V., and Staadt, O. 2003. blue-c: A spatially immersive display and 3d video portal for telepresence. 819--827. Google ScholarDigital Library
- Kho, Y., and Garland, M. 2007. Sketching mesh deformations. In SIGGRAPH '07: ACM SIGGRAPH 2007 courses, ACM, New York, NY, USA, 41. Google ScholarDigital Library
- Knoblauch, D., and Kuester, F. 2009. Focused volumetric visual hull with color extraction. In ISVC '09: Proceedings of the 5th International Symposium on Advances in Visual Computing, Springer-Verlag, Berlin, Heidelberg, 208--217. Google ScholarDigital Library
- Knoblauch, D., Font, P. M., and Kuester, F. 2010. Virtualizeme: Real-time avatar creation for tele-immersion environments. In Proceeding of Virtual Reality Conference (VR), 2010 IEEE, IEEE, 279--280. Google ScholarDigital Library
- LaMar, E., Hamann, B., and Joy, K. I. 1999. Multiresolution techniques for interactive texture-based volume visualization. In VIS '99: Proceedings of the conference on Visualization '99, IEEE Computer Society Press, Los Alamitos, CA, USA, 355--361. Google ScholarDigital Library
- Laurentini, A. 1994. The visual hull concept for silhouette-based image understanding. IEEE Transactions on Pattern Analysis and Machine Intelligence 16, 2, 150--162. Google ScholarDigital Library
- Li, M., Magnor, M., and Seidel, H. 2003. Hardware-accelerated visual hull reconstruction and rendering. In Graphics Interface Proceedings 2003: Canadian Human-Computer Communications Society, AK Peters, Ltd., 65.Google Scholar
- Matusik, W., Buehler, C., and McMillan, L. 2001. Polyhedral visual hulls for real-time rendering. In Rendering Techniques 2001: Proceedings of the Eurographics Workshop in London, United Kingdom, June 25--27, 2001, Springer, 115. Google ScholarDigital Library
- Nieto-Castanon, A., Ghosh, S., Tourville, J., and Guenther, F. 2003. Region of interest based analysis of functional imaging data. Neuroimage 19, 4, 1303--1316.Google ScholarCross Ref
- Potmesil, M. 1987. Generating octree models of 3D objects from their silhouettes in a sequence of images. Computer Vision, Graphics, and Image Processing 40, 1, 1--29. Google ScholarDigital Library
- Sadagic, A., H., T., Lanier, J., Fuchs, H., Van Dam, A., Daniilidis, K., Mulligan, J., Holden, L., and Zelenik, 2001. National tele-immersion initiative: Towards compelling tele-immersive collaborative environments. Presentation given at Medicine meets Virtual Reality 2001 Conference.Google Scholar
- Vlasic, D., Baran, I., Matusik, W., and Popović, J. 2008. Articulated mesh animation from multi-view silhouettes. ACM Trans. Graph. 27, 3, 1--9. Google ScholarDigital Library
- Wu, W., Yang, Z., Nahrstedt, K., Kurillo, G., and Bajcsy, R. 2007. Towards multi-site collaboration in tele-immersive environments. In MULTIMEDIA '07: Proceedings of the 15th international conference on Multimedia, ACM, New York, NY, USA, 767--770. Google ScholarDigital Library
Index Terms
- Region-of-interest volumetric visual hull refinement
Recommendations
Perceived interest and overt visual attention in natural images
Region of interest (ROI) based image and video processing has attracted increased research efforts in recent years. The concept of perceptual ROI, however, is not always clearly defined leading to different interpretations between researchers related to ...
High quality visual hull reconstruction by delaunay refinement
Transactions on computational science IXIn this paper, we employ Delaunay triangulation techniques to reconstruct high quality visual hulls. From a set of calibrated images, the algorithm first computes a sparse set of initial points with a dandelion model and builds a Delaunay triangulation ...
Visual hull with silhouette maps
ICVR'07: Proceedings of the 2nd international conference on Virtual realityVisual hull is intersection of cones made by back-projections of reference images. We introduce a real-time rendering method of jaggy-free visual hull on programmable graphics hardware. Visual hull can be rendered quickly by using texture mapping ...
Comments