Video hologram and device for reconstructing video holograms using a fresnel transform

Abstract

A display device generates a holographic reconstruction of a three dimensional scene from a hologram; the device is operable such that the holographic reconstruction is the Fresnel transform of the hologram and not the Fourier transform of the hologram. With a conventional holographic display, at least some of the holographic reconstruction can always be described as the Fourier transform of the hologram.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional application of U.S. patent application Ser. No. 10 / 534,877 filed by A. Schwerdtner on May 12, 2005 entitled “Video Hologram and Device for Reconstructing Video Holograms”, the contents of which are hereby incorporated by reference. [0002] U.S. patent application Ser. No. 10 / 534,877 application is, in turn, related to, and claims priority from, PCT patent application PCT / DE03 / 03791 filed on Nov. 11, 2003 and to German Patent application DE 10253292.3 filed on Nov. 13, 2002, the contents of both of which are hereby incorporated by reference. FIELD OF THE INVENTION [0003] The present invention relates to a video hologram and a device for reconstructing video holograms having an optical system that includes at least one light source, a lens and a hologram-bearing medium composed of cells arranged in a matrix or an otherwise regular pattern, with at least one opening per cell, and with the phase or amplitude ...

AI Technical Summary

Benefits of technology

[0021] An implementation of this invention also allows the efficient reconstruction of a video hologram in color. Here, the reconstruction is performed with at least three openings per cell, representing the three primary colors. The amplitude or phase of the openings may be controllable, and the openings may be encoded individually for each of the primary colors. Another possibility of reconstructing a video hologram in color is to perform at least three reconstructions one after another, namely for the individual primary colors, ...

Problems solved by technology

Due to their great depth, these elements are voluminous and heavy.

It is difficult to miniaturize them, so that their range of applications is limited.

The usable extent of the reconstruction is thus gradually limited.

However, this is currently not feasible in the form of displays with controllable openings, as discussed in, for instance, U.S. Pat. No. 6,831,678 issued to Travis on Dec. 14, 2004 entitled “Autostereoscopic display”, the contents of which are hereby incorporated by reference.

Fourier transformations of data flows of this magnitude exceed the capabilities of today's computers by far and do thus not allow holograms to be calculated based on local computers.

However, transmitting such an amount of data through data networks is presently unfeasible for normal users...

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