Patent ID: 8493642

Claim:
A method for generating video holograms for a holographic display device with at least one light modulator means, comprising: dividing a scene into object points; encoding the scene as an entire hologram onto said at least one modulator means; tracking a variable position of an observer eye, said position of said observer eye comprising a visibility region and the scene being viewable as a reconstruction from the visibility region, the visibility region lying within one periodicity interval of the reconstruction; encoding sub-holograms on the light modulator means, each of said sub-holograms being a subset of the entire hologram and comprising a size and a position depending on the position of the visibility region and a position of an object point of the scene to be reconstructed; and forming the entire hologram by superpositioning of said sub-holograms, where, in a sequence of image contents for each image: the differential sub-holograms of object points which differ in subsequent images of the sequence are generated, where a differential sub-hologram is defined with regard to the visibility from the observer eyes: (a) by the difference of the sub-hologram of an object point which disappeared in the current image, and the sub-hologram of an object point which was covered by the object point which disappeared in the preceding image and which is now visible, or (b) by the difference of the sub-hologram of an object point which is now visible in the current image and the sub-hologram of an object point which was covered by another object point in the preceding image, and (c) in the case of unchanged visibility, the sub-holograms of the colour and intensity changes at the position of the object point, or data which describe such changes, where the generated video holograms are provided to storage means or transferred to the holographic display device.