Synonyms
Definition
The visual hull of a three-dimensional object is a bounding volume of the object which is computed from the object's silhouettes in the images of multiple calibrated cameras by intersecting the object's viewing cones.
Background
The concept of visual hull is based on two intuitions: Firstly, the shape of a three-dimensional object is bounded by the silhouette of its projection in an image. Secondly, if several projections from multiple viewpoints are available, these constraints can be combined to obtain an approximation of the object's shape. The practical relevance of visual hull algorithms lies in the fact that they can compute an approximate 3D shape using only silhouettes and calibration data. These are often easier and faster to obtain than image-to-image correspondences, especially for camera configurations with few cameras and/or wide baselines. Visual hull computation is the prototypical example of a shape-from-silhouette method.
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References
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Schneider, D.C. (2014). Visual Hull. In: Ikeuchi, K. (eds) Computer Vision. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-31439-6_211
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DOI: https://doi.org/10.1007/978-0-387-31439-6_211
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