说明：  CVPR2012_oral Micro Phase Shifting
(We consider the problem of shape recovery for real world scenes, where a variety of global illumination (in- terreflections, subsurface scattering, etc.) and illumi- nation defocus effects are present. These effects in- troduce systematic and often significant errors in the recovered shape. We introduce a structured light tech- nique called Micro Phase Shifting, which overcomes these problems. The key idea is to project sinusoidal patterns with frequencies limited to a narrow, high- frequency band. These patterns produce a set of im- ages over which global illumination and defocus effects remain constant for each point in the scene. This en- ables high quality reconstructions of scenes which have traditionally been considered hard, using only a small number of images. We also derive theoretical lower bounds on the number of input images needed for phase shifting and show that Micro PS achieves the bound.)