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.