Digital holography has been demonstrated as a very versatile imaging method with significant impact in several scientific topics such as biomedical imaging, tomography imaging, particle tracking, MEMS metrology, and also non-destructive testing. The quality of the reconstructed images from digital holograms may be affected by several experimental parameters such as the architecture of the set-up, the image sensor, the light source, or electronic noise sources. This has the consequence that the reconstructed complex amplitude may suffer from structural deformation and speckle noise. In the paper by Dwivedi et al., the overall quality of digital holographic images is investigated deeply. The authors record and process digital off-axis holograms from three different architectures and several experimental conditions. In order to quantitatively appraise their results, they use indicators such as the speckle index, the peak-signal-to-noise ratio, the mean square error and the structural similarity index measure. Their experimental results indicate that the experimental configuration mixing a concave and a convex lens provides the best collection of photons and finally the best quality of holographic images.
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