Method and system for optical imaging and ranging

US7705970B2 · kind B2 · utility

Assignee

• The Regents of the University of Colorado · US

Inventors

• Rafael Piestun · Boulder, US
• Carol J. Cogswell · Boulder, US
• Adam Douglas Greengard · Louisville, US
• Yoav Schechner · Kiryat Bialik, IL

Key dates

• Filing date: Jun 5, 2007
• Grant date: Apr 27, 2010
• Expiry date: Jul 17, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G01C3/08
• WIPO field: Measurement
• WIPO sector: Instruments

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.