Importance

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Abstract

Ranges and transverse coordinates of point light sources are estimated by forming an out-of-focus image of the point light sources using a camera. The out-of-focus image is formed such that it is imaged as a disk or ring having a bright periphery. This is conveniently achieved by taking advantage of under- or overcorrected spherical aberration in the lens, or of diffraction effects caused by the interaction of light with the aperture of the lens. Range estimates can be calculated from a size metric of the disk or ring, which in turn can be accurately determined due to its bright periphery. Range estimates can also be obtained using certain pattern matching methods.

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First Claim