Spectral Focal Sweep: Extended depth of field from chromatic aberrations

Oliver Cossairt*, Shree Nayar

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

58 Scopus citations

Abstract

In recent years, many new camera designs have been proposed which preserve image detail over a larger depth range than conventional cameras. These methods rely on either mechanical motion or a custom optical element placed in the pupil plane of a camera lens to create the desired point spread function (PSF). This work introduces a new Spectral Focal Sweep (SFS) camera which can be used to extend depth of field (DOF) when some information about the reflectance spectra of objects being imaged is known. Our core idea is to exploit the principle that for a lens without chromatic correction, the focal length varies with wavelength. We use a SFS camera to capture an image that effectively "sweeps" the focal plane continuously through a scene without the need for either mechanical motion or custom optical elements. We demonstrate that this approach simplifies lens design constraints, enabling an inexpensive implementation to be constructed with off-the-shelf components. We verify the effectiveness of our implementation and show several example images illustrating a significant increase in DOF over conventional cameras.

Original languageEnglish (US)
Title of host publication2010 IEEE International Conference on Computational Photography, ICCP 2010
DOIs
StatePublished - Nov 17 2010
Event2010 IEEE International Conference on Computational Photography, ICCP 2010 - Cambridge, MA, United States
Duration: Mar 29 2010Mar 30 2010

Publication series

Name2010 IEEE International Conference on Computational Photography, ICCP 2010

Other

Other2010 IEEE International Conference on Computational Photography, ICCP 2010
Country/TerritoryUnited States
CityCambridge, MA
Period3/29/103/30/10

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Instrumentation
  • Atomic and Molecular Physics, and Optics

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