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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 9 — Apr. 23, 2012
  • pp: 9382–9395

Surpassing digital holography limits by lensless object scanning holography

Vicente Micó, Carlos Ferreira, and Javier García  »View Author Affiliations

Optics Express, Vol. 20, Issue 9, pp. 9382-9395 (2012)

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We present lensless object scanning holography (LOSH) as a fully lensless method, capable of improving image quality in reflective digital Fourier holography, by means of an extremely simplified experimental setup. LOSH is based on the recording and digital post-processing of a set of digital lensless holograms and results in a synthetic image with improved resolution, field of view (FOV), signal-to-noise ratio (SNR), and depth of field (DOF). The superresolution (SR) effect arises from the generation of a synthetic aperture (SA) based on the linear movement of the inspected object. The same scanning principle enlarges the object FOV. SNR enhancement is achieved by speckle suppression and coherent artifacts averaging due to the coherent addition of the multiple partially overlapping bandpass images. And DOF extension is performed by digital refocusing to different object’s sections. Experimental results showing an impressive image quality improvement are reported for a one-dimensional reflective resolution test target.

© 2012 OSA

OCIS Codes
(090.4220) Holography : Multiplex holography
(100.2000) Image processing : Digital image processing
(100.6640) Image processing : Superresolution
(090.1995) Holography : Digital holography

ToC Category:

Original Manuscript: February 3, 2012
Revised Manuscript: March 9, 2012
Manuscript Accepted: March 11, 2012
Published: April 9, 2012

Vicente Micó, Carlos Ferreira, and Javier García, "Surpassing digital holography limits by lensless object scanning holography," Opt. Express 20, 9382-9395 (2012)

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