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US Patent 7542090 System and method for high-resolution with a small-format focal-plane array using spatial modulation

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Patent
Patent
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Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
0
Patent Number
75420900
Patent Inventor Names
John Merchant0
Date of Patent
June 2, 2009
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Patent Application Number
108063490
Date Filed
March 22, 2004
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Patent Citations Received
‌
US Patent 11656452 Apparatus for optical see-through head mounted display with mutual occlusion and opaqueness control capability
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Patent Primary Examiner
‌
Nhan T Tran
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Patent abstract

This invention provides a system and method for balanced-demodulation procedures that remove image clutter even in the presence of scene motion. A system that employs balanced demodulation moves a chopping reticle located in the intermediate focal plane where front end optics focus a high-resolution image. The chopping reticle has a checkerboard pattern of clear and opaque cells and moves in an uneven rate (e.g. Δx≠Δy) along the x-axis and y-axis. The resulting image is projected on a focal plane array from which differences are calculated to generate the desired balanced demodulation value. This invention further provides a foveal enhancement of the baseline spatial-modulation staring sensor. In this enhancement the WFOV low-resolution conventional image is displayed to the operator, but with a selectable subarea of that image replaced by a conventionally generated high-resolution image at the same scale. The operator would be able to naturally select the region for foveal enhancement by simply pointing directly at the detail of special interest which would then be displayed to the user at high-resolution. The remainder of the scene would be displayed at low-resolution, typically with marks at the locations of point sources detected by the spatial modulation.

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