CS231A Course Notes 5: Active and Volumetric Stereo

In traditional stereo, the main idea is to use corresponding points p and p′ to estimate the location of a 3D point P by triangulation. A key challenge here, is to solve the correspondence problem: how do we know whether a point p actually corresponds to a point p′ in another image? This problem is further accentuated by the fact that we need to handle the many 3D points that are present in the scene. The focus of these notes will discuss alternative techniques that work well in reconstructing the 3D structure.