"Absolute phase assisted three-dimensional data registration for a dual-camera structured light system," Appl. Opt., (2008)

[16] S Zhang and S-T Yau, "Absolute phase assisted three-dimensional data registration for a dual-camera structured light system,"  Appl. Opt., 47(17), 3134-3142, 2008 (Cover Feature); doi: 10.1364/AO.47.003134

For a three-dimensional shape measurement system with a single projector and multiple cameras, registering patches from different cameras is crucial. Registration usually involves a complicated and timeconsuming procedure. We propose a new method that can robustly match different patches via absolute phase without significantly increasing its cost. For y and z coordinates, the transformations from one camera to the other are approximated as third-order polynomial functions of the absolute phase. The x coordinates involve only translations and scalings. These functions are calibrated and only need to be determined once. Experiments demonstrated that the alignment error is within RMS 0:7 mm. © 2008 Optical Society of America