Auto stereoscopic 3D telepresence using integral holography
First Claim
1. An auto stereoscopic integral holographic display, comprising:
- a dynamic refreshable holographic recording material held in a stationary mount to present a stationary direct-view display to an audience;
a memory;
hogel data stored in said memory, said hogel data encoded using integral imaging from multiple views of a scene, said hogel data representing a temporal sequence of multiple holograms for presentation to the audience at a refresh rate;
a pulsed laser that produces a coherent pulsed beam at a repetition rate to support presentation of the holograms at the refresh rate;
a beam splitter that splits the coherent pulsed beam into an object beam and a reference beam;
a spatial light modulator (SLM), said hogel data loaded into said SLM as an image to spatially modulate the amplitude of the object beam with the hogel data, said hogel data loaded into said SLM at a load rate to support presentation of the holograms at the refresh rate;
a beam steering mechanism that steers the modulated object beam and the reference beam relative to the stationary holographic recording material to interfere at the material and write successive hogels at different locations on the material to record the holograms at the refresh rate;
a reading source that directs a reading beam onto the holographic recording material, said reading beam diffracted by the hologram to produce a diffracted beam that presents the auto stereoscopic integral hologram to the audience, said hologram being refreshed at said refresh rate; and
control electronics that synchronize the pulsed laser, beam steering mechanism and SLM.
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Accused Products
Abstract
A holographic direct-view display system uses holographic integral imaging techniques that is an auto stereoscopic way to reproduce parallax and occlusion. The display is not resolution limited and is scalable to display life size images if desired. The system can be used to transmit 3D depictions of a scene at video and sub-video rates as well as other information, such as images of documents or computer generated images. The images may be captured, transmitted and displayed in real-time (or near real-time) for telepresence or stored for time-shifted display. The system combines integral holography, a pulsed laser to record the hologram at high speed and a dynamic refreshable holographic material such as a photorefractive polymer as a recording media. The system uses techniques to write, read and erase the updateable hologram that allow the holographic material, hence direct-view display to remain stationary throughout each of the processes for continuous presentation of the hologram to the audience. The system may write, read and erase at the same time and continuously to increase throughput. This system may also use additional novel techniques to improve brightness, efficiently implement a full-parallax display and to implement a full-color display in a transmission geometry.
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Citations
34 Claims
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1. An auto stereoscopic integral holographic display, comprising:
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a dynamic refreshable holographic recording material held in a stationary mount to present a stationary direct-view display to an audience; a memory; hogel data stored in said memory, said hogel data encoded using integral imaging from multiple views of a scene, said hogel data representing a temporal sequence of multiple holograms for presentation to the audience at a refresh rate; a pulsed laser that produces a coherent pulsed beam at a repetition rate to support presentation of the holograms at the refresh rate; a beam splitter that splits the coherent pulsed beam into an object beam and a reference beam; a spatial light modulator (SLM), said hogel data loaded into said SLM as an image to spatially modulate the amplitude of the object beam with the hogel data, said hogel data loaded into said SLM at a load rate to support presentation of the holograms at the refresh rate; a beam steering mechanism that steers the modulated object beam and the reference beam relative to the stationary holographic recording material to interfere at the material and write successive hogels at different locations on the material to record the holograms at the refresh rate; a reading source that directs a reading beam onto the holographic recording material, said reading beam diffracted by the hologram to produce a diffracted beam that presents the auto stereoscopic integral hologram to the audience, said hologram being refreshed at said refresh rate; and control electronics that synchronize the pulsed laser, beam steering mechanism and SLM. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A telepresence system, comprising:
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an image capture system including multiple video cameras that capture multiple images of a scene according to different positions; a computer that processes the images and calculates the hogel data using integral imagery at a refresh rate of the holographic display; a network that transmits the hogel data to a remote location; and an auto stereoscopic integral holographic display at the remote location to present the auto stereoscopic integral holograms of the scene at the refresh rate to the audience in real or near real-time from initial capture, comprising; a dynamic refreshable holographic recording material held in a stationary mount to present a stationary direct-view display to an audience; a memory; hogel data stored in said memory, said hogel data encoded using integral imaging from multiple views of a scene, said hogel data representing a temporal sequence of multiple holograms for presentation to the audience at a refresh rate; a pulsed laser that produces a coherent pulsed beat at a repetition rate to support presentation of the holograms at the refresh rate; a beam splitter that splits the coherent pulsed beam into an objecting beam and a reference beam; a spatial light modulator (SLM), said hogel data loaded into said SLM as image to spatially modulate the amplitude of the object beam with the hogel data, said hogel data loaded into said SLM at a load rate to support presentation of the holograms at the refresh rate; a beam steering mechanism that steers the modulated object beam and the reference beam relative to the stationary holographic recording material to interfere at the material and write successive hogels at different locations on the material to record the holograms at the refresh rate; a reading source that directs a reading beam onto the holographic recording material, said reading beam diffracted by the hologram to produce a diffracted beam that presents the auto stereoscopic integral hologram to the audience, said hologram being refreshed at said refresh rate; and control electronics that synchronize the pulsed laser, beam steering mechanism and SLM.
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32. An auto stereoscopic integral holographic display, comprising:
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a dynamic refreshable holographic recording material comprising a photorefractive (PR) polymer held in a stationary mount to present a stationary direct-view display to an audience; a memory; hogel data stored in said memory, said hogel data encoded using integral imaging from multiple views of a scene, said hogel data representing a temporal sequence of multiple holograms for presentation to the audience at a refresh rate of at least 0.1 Hz, 0.5 Hz, 1 Hz, 30 Hz or 60 Hz; a pulsed laser that produces a coherent pulsed beat at a sub-nanosecond repetition rate to support presentation of the holograms at the refresh rate; a beam splitter that splits the coherent pulsed beam into an objecting beam and a reference beam; a spatial light modulator (SLM), said hogel data loaded into said SLM as image to spatially modulate the amplitude of the object beam with the hogel data, said hogel data loaded into said SLM at a load rate to support presentation of the holograms at the refresh rate; a beam steering mechanism that steers the modulated object beam and the reference beam relative to the stationary holographic recording material to interfere at the material and write successive hogels at different locations on the material to record the holograms at the refresh rate; a reading source that directs a reading beam onto the holographic recording material, said reading beam diffracted by the hologram to produce a diffracted beam that presents the auto stereoscopic integral hologram continuously to the audience while said object and reference beams continue to record hogels to refresh the hologram at said refresh rate; an erase source that directs a focused erase beam onto the material that erases hogel date for the previous hologram while the modulated object beam and reference beam record successive hogels to record the current hologram and control electronics that synchronize the pulsed laser, beam steering mechanism and SLM. - View Dependent Claims (33, 34)
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Specification