SYSTEM AND METHOD FOR EXTENDING DEPTH OF FIELD IN A LENS SYSTEM BY USE OF COLOR-DEPENDENT WAVEFRONT CODING

Title:

SYSTEM AND METHOD FOR EXTENDING DEPTH OF FIELD IN A LENS SYSTEM BY USE OF COLOR-DEPENDENT WAVEFRONT CODING

Document Type and Number:

WIPO Patent Application WO/2012/166995

Kind Code:

A3

Abstract:

An optical system for generating an image having extended depth of field. The system includes a phase mask and a chromatic wavefront coding lens. The chromatic wavefront coding lens provides axial color separation of light by generating specified chromatic aberration in an image created by the lens. The phase mask causes the optical transfer function of the optical system to remain substantially constant within a specified range away from the image plane, and the optical transfer function of the system contains no zeroes within at least one spectral passband of interest. Digital processing may be performed on the image to generate a final image by reversing a decrease in modulation transfer function generated by the phase mask.

Inventors:

GAO LU (US)
GREENGARD ADAM DOUGLAS (US)

Application Number:

PCT/US2012/040323

Publication Date:

February 28, 2013

Filing Date:

May 31, 2012

Export Citation:

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Assignee:

OMNIVISION TECH INC (US)
GAO LU (US)
GREENGARD ADAM DOUGLAS (US)

International Classes:

G03B17/02; G03B3/02; H04N5/225

Foreign References:

US20040145808A1	2004-07-29
US20080203276A1	2008-08-28
US20100128137A1	2010-05-27
US20060171041A1	2006-08-03

Other References: