Patent ID: 8633969
Filing Date: 2014-01-21
Classification: G02B,G03B,H04N

Abstract:
1. An optical system for capturing images of a three-dimensional object, the optical system comprising a projector for structured illumination of the object, wherein the projector comprises: a light source; a grid mask positioned between the light source and the object for structured illumination of the object; a first Wavefront Coding (WFC) element having a phase modulating mask positioned between the grid mask and the object to receive patterned light from the light source through the grid mask, wherein the first WFC element is constructed and arranged such that a point spread function of the projector is substantially invariant over a wider range of depth of field of the grid mask than a point spread function of the projector without the first WFC element; a detector for detecting the object with structured illumination from the projector; and a second WFC element located between the object and the detector such that a first image of the object and a second image of the grid mask on the detector have a larger depth of field than without the second WFC element; wherein the second WFC element comprises a circularly symmetric WFC element expressed as P(ρ)=f(ρ), wherein ρ