ELECTRO-OPTICS  LABORATORY

We review three different methods of generating digital holograms of 3-D real-existing objects illuminated by incoherent light. In the first method, a scanning hologram is generated by a unique scanning system in which Fresnel zone plates are created by a homodyne rather than the common heterodyne interferometer. To calculate the second hologram, multiple-viewpoint projections of the 3-D scene are acquired, and a hologram of the 3-D scene is directly computed from these projections. The last hologram reviewed here is the Fresnel incoherent correlation hologram. In this motionless technique, light is reflected from the scene, propagates through a diffractive optical element, and is recorded by a digital camera.