Abstract: The method consists of computing (E1-E4) a set of two-dimensional images in a three-dimensional geometrical space representing a virtual object from respective different viewpoints. The virtual object is represented by digital data stored in a computer. Holograms are computed (E5-E6) for the respective two-dimensional images using a fast complex transform, such as a Fourier transform. The holograms are then juxtaposed (E7) to form a digital hologram of the object which is physically reproduced (E8) by a spatial light modulator. A three-dimensional image of the object is obtained by illuminating the spatial light modulator with a coherent source.

Abstract: A three-dimensional image is stored (E0) in a computer memory in the form of digital data and defined in a three-dimensional geometrical space. Two-dimensional images are calculated (E1) by determining, in the three-dimensional geometrical space, the intersections between the three-dimensional image and a plurality of parallel section planes. Respective holograms are calculated (E2) for the two-dimensional images, and are then reproduced (E3) sequentially on a spatial light modulator illuminated by a coherent light source. A transparent three-dimensional image is thus reproduced.

Abstract: The method consists of transforming a digital two-dimensional image defined by a real function into a complex two-dimensional image defined by a complex function, oversampling the complex image, simulating the production of a diffracted image resulting from the diffraction of an optical wave by the oversampled complex image, and adding a complex field representing a reference optical wave to the resulting diffracted image to produce a hologram. The hologram produced in this way can be used to produce images in three dimensions or in telecommunications.