Method and device for 3D imaging

The invention discloses a method and a device for 3D imaging. The method and the device realize 3D imaging just through a set of imaging device. The imaging device has the following three functions: converting source light rays to linear polarization light rays, converting the linear polarization light rays to mixed polarization light rays formed by two kinds of linearly polarized light in different polarization directions through a Faraday effect, and executing image display according to the mixed polarization light rays. An observer can obtain left/right eye images in different polarization directions through ordinary polarization type 3D glasses, so that 3D images can be composited in the brain of the observer. Therefore, compared with a conventional 3D projection technology in which two sets of imaging devices are needed, the method and the device can save a set of imaging device for each 3D imaging system, so as to simplify system structure and reduce system cost. In addition, cost of the polarization type 3D glasses is relatively low, investment for configuring the 3D glasses can be saved, so as to further reduce system cost.