3-D Computational Ghost Imaging With Extended Depth of Field for Measurement

The accuracy of traditional 3-D measurements is limited by the depth of field (DOF), such as in binocular imaging and holography. Ghost imaging (GI) can achieve lensless imaging with a DOF deeper than the traditional imaging. To realize this, a computational GI method is proposed and a system built, in which the light field information and modulation information are used to reconstruct the 3-D image. This system uses two projection devices for light modulation and pattern projecting, and utilizes a detector to receive the reflected signals of the two projectors on the object synchronously. The experiment shows that for an original DOF of 0.4 m, our system can extend the depth to 1.5 m. The method should have the great application prospects in the fields of remote sensing, imaging guidance, and medical imaging.