A new focus measure utilizing l1norms in the Fourier domain provides focal depth estimates without reconstructing an object image. A polar implementation reduces the problem to one dimension, yielding two orders of computational speedup.
© 2007 OSA
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(070.4790) Fourier optics and signal processing : Spectrum analysis
(090.0090) Holography : Holography
(090.1760) Holography : Computer holography
W. Li, N. Loomis, Q. Hu, and C. Davis, " Fast Computation of Focal Planes for Sparsely Populated Digital Holograms Using a Spectral l1Norm," in Adaptive Optics: Analysis and Methods/Computational Optical Sensing and Imaging/Information Photonics/Signal Recovery and Synthesis Topical Meetings on CD-ROM, OSA Technical Digest (CD) (Optical Society of America, 2007), paper DWC5.
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