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Definition
Plane sweeping is a multi-view stereo algorithm notable for its efficiency, especially on modern graphics hardware (GPU).
Background
Plane sweeping addresses the stereo problem, which is to find the surface of a scene, given two or more calibrated views of the scene. Assuming that surfaces are Lambertian and that there are no occlusions, a point on the surface will have the same appearance in all views. Therefore, a conceptual solution to the stereo problem is to find the points that maximize photoconsistency. This can be done by searching along the viewing rays for some image. The distance to the surface along the ray is called depth, and the set of all depths is called a depth map. Plane sweeping is a technique for efficiently organizing this search by sweeping a plane through space. Projecting all points on a plane into a perspective camera is simply a homography transformation, which can be executed efficiently on modern graphics...
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References
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Gallup, D., Pollefeys, M. (2014). Plane Sweeping. In: Ikeuchi, K. (eds) Computer Vision. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-31439-6_205
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DOI: https://doi.org/10.1007/978-0-387-31439-6_205
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