| 摘要 |
Method and apparatus for production of 3-D images (volume displays) from a set of 2-D images employing one or more multiple component holographic optical elements (mcHOEs) in combination with an off-axis array of a plurality of 2-D illuminated (or radiative) components of objects to be synthesized into 3-D images of the objects. An array of component regions is disposed in at least one plane generally normal to a defined optical axis. A mcHOE is disposed in a plane parallel to the plane of the array with the optical axis passing therethrough. The components are illuminated from behind, or are themselves radiative (as, for example, in the case of CRT screen(s)). The observer is positioned along the optical axis in front of the mcHOE. The mcHOEs are virtual image transmission or reflection holograms, but real images may be produced by using the appropriate mcHOE. The component region array is a set of 2-D representations of portions of an object (e.g., each member of the array being a section of the 3-D object to be reconstructed at a unique depth within the object). The component regions are successively illuminated, presented or turned on (in the case of a radiative region), by a light source having a narrow wavelength band substantially similar to that by which the mcHOEs were made. Diffuser screens and/or filters may be employed. When the rate of illumination of each number of array in sequence exceeds the flicker fusion threshold of the observer, the individually projected planes of the array fuse into a 3-D image. By a variety of techniques, the invention is adaptable to applications in various fields, including scientific, technical, medical, entertainment, educational, commercial and advertising. Specific examples shown include real image production, rotation or translation of reconstructed 3-D object images, 3-D holographic television, conjugate back focal plane hologram microscope, interactive 3-D holographic game devices, and the like.
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