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Polyhedral Visual Hulls for RealTime Rendering
 In Proceedings of Twelfth Eurographics Workshop on Rendering
, 2001
"... . We present new algorithms for creating and rendering visual hulls in realtime. Unlike voxel or sampled approaches, we compute an exact polyhedral representation for the visual hull directly from the silhouettes. This representation has a number of advantages: 1) it is a viewindependent represent ..."
Abstract

Cited by 163 (4 self)
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. We present new algorithms for creating and rendering visual hulls in realtime. Unlike voxel or sampled approaches, we compute an exact polyhedral representation for the visual hull directly from the silhouettes. This representation has a number of advantages: 1) it is a viewindependent representation, 2) it is wellsuited to rendering with graphics hardware, and 3) it can be computed very quickly. We render these visual hulls with a viewdependent texturing strategy, which takes into account visibility information that is computed during the creation of the visual hull. We demonstrate these algorithms in a system that asynchronously renders dynamically created visual hulls in realtime. Our system outperforms similar systems of comparable computational power. 1
NonMetric ImageBased Rendering for Video Stabilization
"... We consider the problem of video stabilization: removing unwanted image perturbations due to unstable camera motions. We approach this problem from an imagebased rendering (IBR) standpoint. Given an unstabilized video sequence, the task is to synthesize a new sequence as seen from a stabilized came ..."
Abstract

Cited by 37 (0 self)
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We consider the problem of video stabilization: removing unwanted image perturbations due to unstable camera motions. We approach this problem from an imagebased rendering (IBR) standpoint. Given an unstabilized video sequence, the task is to synthesize a new sequence as seen from a stabilized camera trajectory. This task is relatively straightforward if one has a Euclidean reconstruction of the unstabilized camera trajectory and a suitable IBR algorithm. However, it is often not feasible to obtain a Euclidean reconstruction from an arbitrary video sequence. In light of this problem, we describe IBR techniques for nonmetric reconstructions, which are often much easier to obtain since they do not require camera calibration. These rendering techniques are well suited to the video stabilization problem. The key idea behind our techniques is that all measurements are specified in the image space, rather than in the nonmetric space.
RealTime ImageBased Modeling
"... In this paper, we illustrate an imagebased modeling system that uses polyhedral convex hull representation of its input images. Our algorithm develops over Matusik [1] as a special case of convex objects. Although the formulation is same, convex objects have a lot of symmetric properties that gener ..."
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In this paper, we illustrate an imagebased modeling system that uses polyhedral convex hull representation of its input images. Our algorithm develops over Matusik [1] as a special case of convex objects. Although the formulation is same, convex objects have a lot of symmetric properties that general silhouettes do not have, such as rays cross a convex object a maximum of twice. This reduces the number of edgebin intersections. We also developed a 2.5 D polygon clipper for our system. Our current unoptimized C++ code is able to run at 5 frames/sec, where modeling can be done at around 30 frames/sec for the case of 5 cameras. 1.