A FRAMEWORK FOR REALTIME 3D RECONSTRUCTION BY SPACE CARVING USING GRAPHICS HARDWARE

ISBN: 9783836601993 Géneros: Sinópsis: InhaltsangabeIntroduction Reconstruction of realworld scenes from a set of multiple images is a topic in Computer Vision and 3D Computer Graphics with many interesting applications There is a relation to Augmented and Mixed Reality ARMR ComputerSupported Collaborative Work CSCW ComputerAided industrialarchitectural Design CAD modeling of the realworld eg computer games sceneseffects in movies entertainment eg 3D TVVideo and recognitionanalyzing of realworld characteristics by computer systems and robots There exists a powerful algorithm theory for shape reconstruction from arbitrary viewpoints called shape from photoconsistency However it is computationally expensive and hence can not be used with applications in the field of 3D video or CSCW as well as interactive 3D model creation Attempts have been made to achieve realtime framerates using PC cluster systems While these provide enough performance they are also expensive and less flexible Approaches that use GPU hardwareacceleration on single workstations achieve interactive framerates for novelview synthesis but do not provide an explicit volumetric representation of the whole scene The proposed approach shows the efforts in developing a GPU hardwareaccelerated framework for obtaining the volumetric photo hull of a dynamic 3D scene as seen from multiple calibrated cameras High performance is achieved by employing a shape from silhouette technique in advance to obtain a tight initial volume for shape from photoconsistency Also several speedup techniques are presented to increase efficiency Since the entire processing is done on a single PC the framework can be applied to mobile setups enabling a wide range of further applications The approach is explained using programmable vertex and fragment processors and compared to highly optimized CPU implementations It is shown that the new approach can outperform the latter by more than one magnitude The thesi