6533b85bfe1ef96bd12ba0f1
RESEARCH PRODUCT
Surpassing digital holography limits by lensless object scanning holography.
Javier GarciaVicente MicóCarlos Ferreirasubject
Synthetic aperture radarMicroscopy ConfocalComputer sciencebusiness.industryImage qualityHolographyHolographySpeckle noiseImage processingSignal Processing Computer-AssistedEquipment DesignImage EnhancementSuperresolutionAtomic and Molecular Physics and Opticslaw.inventionEquipment Failure AnalysisSpeckle patternOpticslawDigital image processingDepth of fieldbusinessDigital holographyLensesdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-04-09 | Optics express |