Method and system for optical imaging and ranging
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United States of America Patent
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Apr 27, 2010
Grant Date -
Jun 12, 2008
app pub date -
Jun 5, 2007
filing date -
Jun 5, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
The distance of objects to an optical system is estimated. An optical mask such as a diffractive optical element, continuous phase mask, hologram, amplitude mask, or combination thereof is placed within the optics in front of a sensor array such as a CCD, CID or COMAS device. The optical mask encodes the three-dimensional response of the system. The mask is designed to optimize depth estimation, for example, by maximizing Fisher information. A particular implementation creates a point spread function (“PSF”) that rotates as a function of the object position. The image or images obtained with different PSFs may be digitally processed to recover both a depth map of the scene and other parameters such as image brightness. The digital processing used to recover the depth map of the object may include deconvolution of a PSF from detected images.
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