This makes our approach simpler and easier in practice. In this paper, we show that the pose can be obtained using a single reflection in a spherical mirror of known radius. However, a planar mirror based approach requires a minimum of three reflections and has degenerate configurations where esti- mation fails. Since the camera does not view the object directly, previous approaches have utilized reflec- tions in a planar mirror to solve this problem. We present re- sults on challenging video sequences that include various types of motions and deformations in scenes that contain complex materials like fabric, skin, leaves and wax.Ībstract: We consider the problem of estimating the extrinsic pa- rameters (pose) of a camera with respect to a reference 3D object without a direct view. We compare our motion compensated method to alternatives such as single shot separation and frame interleaving as well as ground truth. Key to our method is be- ing able to register frames in a video sequence to each other in the presence of time varying, high frequency active illu- mination patterns. In this pa- per, we develop a motion compensation method that relaxes this condition and allows direct-global separation to be per- formed on video sequences of dynamic scenes captured by moving projector-camera systems. Practical methods for finding the direct and global components use multiple images captured under varying illumination patterns and require the scene, light source and camera to remain sta- tionary during the image acquisition process.
Abstract: Separating the direct and global components of radiance can aid shape recovery algorithms and can provide useful information about materials in a scene.