Abstract: A hologram surface to express a phase distribution, a visual field in which a solid image can be seen; and a stereoscopic display limit are set in a virtual space. A target to be stereoscopically displayed is subsequently expressed in the virtual space by a set of micro polygons. A plurality of slice planes which are parallel with the horizontal plane are set into the virtual space including the target. The line segments which intersect the polygons are obtained for every slice plane. The detected line segment is divided or clipped as necessary and is finally divided into the portion which can be always seen from the whole region of the visual field and a portion which is obstructed by another line segment and can be seen from only a part of the visual field, thereby extracting the line segment.

Abstract: Apparatus, system, and method is described wherein a synthetic aperture based sequence of image samples are generated with respect to a subject to be stereoscopically imaged. These sample images are presented to the spaced inputs of a holographic integrated combiner screen to be presented at an output aperture in laterally spaced mutual positioning. That spacing is selected, in one aspect, as one-half of the interpupillary distance of human eyes and thus binocular stereoscopic viewing at the aperture is achieved. The combiner screen may be utilized in conjunction with a holographic optical image combiner architecture which additionally employs a lens assembly such as a projecting lens to generate multi-zone outputs, each zone of which may be presented for stereoscopic viewing at a discrete viewing station. Correction for chromatic aberration of the holographic optical components is described.

Abstract: A closed loop frequency control system for maintaining accurate linearity in the transmitted signal (60) in a linear frequency modulated (LFM) chirped laser radar system. A correction signal (50), derived from an output pulse monitor is summed with the modulation waveform (18) to correct non-linearities in real time.

Abstract: A method and apparatus for producing temporally coherent, full color holograms is disclosed whereby a linear array of stereographically positioned cameras are simultaneously triggered to obtain a temporally coherent sequence of full color exposures. The exposures are then sequentially exposed upon an H1 plate using multiple wavelength, "white" laser light to obtain a virtual full color hologram image in a single step operation.

Abstract: Apparatus and method for storing holographic synthesized information for reflection integral Bragg holograms, free of the limitations of dispersing elements (such as unilateral diffusing screens, conventional lenticular screens and Fresnel lenses), multiple reference beams, mirrorized indexing or other similar materials or techniques. These holograms accurately satisfy Bragg's condition, provide an expanded (and essentially normal) vertical viewing range and can be displayed both flat (in which case the image is behind the film plane) or concave towards the viewer (in which case the image is in front of the film plane). Flat and curved holograms can be combined together. The final holographic images are produced directly from motion picture film, without intermediate transfer prints as required by the prior art. All are front illuminated. By curving the developed hologram for viewing a high definition projection image is obtained.

Abstract: The present invention provides a method and apparatus for producing a hologram from a series of two-dimensional images horizontally different in line of sight from each other. The holographic apparatus employs original images produced by photographing an object from different directions, an object optical system which makes a light be incident upon original image to project an object beam onto photo-sensitive material, and a reference optical system which projects a reference beam of a same wavelength as the object beam toward the photo-sensitive material. The horizontal component of the object beam can be converged at a rear point i.e., a point of view at image reproduction, relatively distant from the photo-sensitive material on which a hologram is produced. When the hologram is reconstructed, a beam having the same wavelength as when recorded is converged at the rear point of view, so that the reconstructed image can be viewed in a same color free from any color shading.

Abstract: An animated holographic stereogram display and method of creating the same is disclosed. In accordance with the method, a user views a hologram from a fixed relative position, the hologram containing a plurality of stereographic image pairs. A plurality of light sources are appropriately spatially dispersed so that each light source will illuminate the hologram so as to make the one stereographic image pair associated with that light source and viewing position viewable by the user. By using stereographic image pairs which are related to each other and appropriate time sequencing of the light sources, animation of the image pairs may be achieved. Uses of the system include facial animation whereby facial image pairs associated with various phonemes may be sequenced in accordance with a speech signal so that a limited set of image pairs may animate the face for a substantially unlimited vocabulary.

Abstract: A method and apparatus for producing temporally coherent, full color holograms is disclosed whereby a linear array of stereographically positioned cameras are simultaneously triggered to obtain a temporally coherent sequence of full color exposures. The exposures are then sequentially exposed upon an H1 plate using multiple wavelength, "white" laser light to obtain a virtual full color hologram image in a single step operation.

Abstract: An electronic autostereoscopic display that presents 3D images through the use of horizontal parallax is disclosed. The device disclosed presents a 3D image, viewable over 360 degrees or less, without the need of special viewing glasses. The image is created electronically and in real-time, thus it can immediately display data gathered remotely, as in live 3D television, and similar applications. The autostereoscope consists of a cylindrical holographic optical element (HOE) which is spun about its axis of symmetry by a motor, light sources such as lasers emit light beams incident on the HOE, and electronic circuitry modulates the lasers according to data received and the angular displacement of the HOE. The HOE consists of 2 basic types of holograms which perform 2 different functions. The first type of hologram performs two dimensional raster scans onto the second type of hologram.

Abstract: A holographic display includes "segmented" images configured as if positioned in separate viewing "cells" corresponding spatially to preselected subareas of a desired display area with invisible segmenting cell sides. In one embodiment, a polarized conjugate reference light source projects the segmented hologram images form a light-transmissive recording medium into the display area, a multi-element nematic 90.degree. twisted shutter assembly changes the polarization of light emanating from subareas corresponding to the images to be blocked while keeping unchanged the polarization of the segmented images to be displayed, and a sheet polarizer positioned between the multi-element shutter and the viewer blocks from view images from those subareas which the polarization direction has been changed by the multi-element shutter. In other embodiments, light-reflective recording mediums and multi-element nematic shutters having an appropriate guest-host dyes are used.