IEEE Trans Vis Comput Graph - Temporal Coherence in Image-based Visual Hull Rendering.

Tópicos

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Resumo

Image-based visual hull rendering is a method for generating depth maps of a desired viewpoint from a set of silhouette images captured by calibrated cameras. It does not compute a view-independent data representation, such as a voxel grid or a mesh, which makes it particularly efficient for dynamic scenes. When users are captured, the scene is usually dynamic, but does not change rapidly because people move smoothly within a sub-second time frame. Exploiting this temporal coherence to avoid redundant calculations is challenging because of the lack of an explicit data representation. This paper analyses the image-based visual hull algorithm to find intermediate information that stays valid over time and is therefore worth to make explicit. We then derive methods that exploit this information to improve the rendering performance. Our methods reduce the execution time by up to 25%. When the user's motions are very slow, reductions of up to 50% are achieved.

Resumo Limpo

imagebas visual hull render method generat depth map desir viewpoint set silhouett imag captur calibr camera comput viewindepend data represent voxel grid mesh make particular effici dynam scene user captur scene usual dynam chang rapid peopl move smooth within subsecond time frame exploit tempor coher avoid redund calcul challeng lack explicit data represent paper analys imagebas visual hull algorithm find intermedi inform stay valid time therefor worth make explicit deriv method exploit inform improv render perform method reduc execut time user motion slow reduct achiev

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