Closed loop feedback control to maximize stereo separation in 3D imaging systems
AssigneeInternational Business Machines Corporation
InventorsCasimer M. DeCusatis, Timothy M. Trifilo
Life of this patent
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Abstract
An apparatus and method for stereoscopic 3D image projection and viewing using a single projection source, alternating polarization, and passive eyewear. This approach is applicable to frame sequential video created using existing 3D graphics APIs, as well as other video signal formats, and is compatible with existing digital light processor (DLP) technology for both front and rear projection systems. An alternating polarizer filter actuator in the form of a closed feedback loop is used to modulate the projected image. A preferred embodiment enables an existing DLP projection system to be enhanced with 3D capability.
Claims9
A device comprising:
- an input for receiving stereographic image data that includes sync signals corresponding to image streams in an image data;
- a voice coil actuator coupled to an arm having attached thereto first and second type polarized filters for oscillating the polarized filters, the first and second type polarized filter configured to filter at least one image stream;
- and
- a motor drive circuit coupled to the input for receiving said sync signals and for synchronizing said oscillation of said voice coil actuator with said sync signals
- wherein the pair of polarized filters is each disposed such that at a first terminus point of the oscillating movement of the arm an angle of polarization of one of the filters is offset by approximately 90 degrees relative to an angle of polarization of a second one of the filters at a second terminus point of the oscillating movement of the arm.
Dependencies are inferred from the claim text.