Superresolution imaging method using phaseshifting digital lensless fourier holography

Luis Granero, Vicente Micó, Zeev Zalevsky, Javier García

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

A method which is useful for obtaining superresolved imaging in a digital lensless Fourier holographic configuration is presented. By placing a diffraction grating between the input object and the CCD recording device, additional high-order spatial-frequency content of the object spectrum is directed towards the CCD. Unlike other similar methods, the recovery of the different band pass images is performed by inserting a reference beam in on-axis mode and using phase-shifting method. This strategy provides advantages concerning the usage of the whole frequency plane as imaging plane. Thus, the method is no longer limited by the zero order term and the twin image. Finally, the whole process results in a synthetic aperture generation that expands up the system cutoff frequency and yields a superresolution effect. Experimental results validate our concepts for a resolution improvement factor of 3.

Original languageEnglish
Pages (from-to)15008-15022
Number of pages15
JournalOptics Express
Volume17
Issue number17
DOIs
StatePublished - 17 Aug 2009

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