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 Optical Society of America
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