Method of Increasing the Spatial Resolution in Digital Holographic Microscopy

Guzhov, V. I.; Il’inykh, S. P.; Marchenko, I. O.

doi:10.3103/s8756699018030135

Cited by 5 publications

(1 citation statement)

References 5 publications

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“…As a rule, most of these methods are based on an algorithm of interpolation of several recorded holograms. For example, one of the methods consists of the spatial shift of the photodetector by an amount less than the value of the spatial resolution element used [ 24 ]. There is also a method of numerical interpolation of several holograms by providing a parallel phase shift using a polarizing image sensor [ 25 ].…”

Section: Photodetectors With a Two-dimensional Discrete Matrixmentioning

confidence: 99%

Advances in Digital Holographic Interferometry

et al. 2022

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Holographic interferometry is a well-established field of science and optical engineering. It has a half-century history of successful implementation as the solution to numerous technical tasks and problems. However, fast progress in digital and computer holography has promoted it to a new level of possibilities and has opened brand new fields of its application. In this review paper, we consider some such new techniques and applications.

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Section: Photodetectors With a Two-dimensional Discrete Matrixmentioning

confidence: 99%

Advances in Digital Holographic Interferometry

et al. 2022

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Analog-to-digital conversion of information archived in display holograms: I. discussion

2023

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This discussion paper highlights the potential of display holograms in the storage of information about objects’ shape. The images recorded and reconstructed from holograms have high visual appeal, and the holographic carrier has far higher information capacity than other storage media. One hindrance to the application of display holograms is the inadequate development of techniques for digitizing information from them, which is compounded by insufficient analysis and discussion of existing approaches. In this review, we provide a historical retrospective of the use of display holography to save comprehensive information on object morphology. We also discuss existing and emerging technologies for converting information into a digital format, addressing one of the most serious challenges to the widespread use of display holography. Potential applications of these technologies are also analyzed.

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Increasing the spatial resolution of signals in optical systems

2022

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Reconstruction of the signal in the intervals between discrete values is of great importance in solving the problem of spatial superresolution in optical microscopy and digital holography. The article deals with the issue of restoring high-resolution image elements from a certain number of raster images displaced by a sub-pixel shift. The numerical values of the image samples are obtained by spatial integration over some finite area of regular rasters. The spatial resolution is increased using an analytical expression for the spectrum of discrete signals obtained using the apparatus of generalized functions. Unlike ideal sampling, the spectrum of the function is supplemented by a multiplier, whose form depends on the type of aperture. To obtain high-resolution image elements, it is necessary to divide the Fourier spectrum of the sampled image by a factor depending on the selected aperture. The spectrum of the aperture is usually used, therefore, if the spectrum of the image obtained by averaging over a certain aperture is known, then the spectrum of the original image can also be obtained. Apertures of various shapes are used, for example, elliptical, diamond-shaped, hexagonal, but most often rectangular apertures. The simulation results are presented for a rectangular aperture but in the case of its substitution with, for example, a set of regular apertures in the form of a circle, the expression will be true for regular circular rasters. The analytical expression for the spectrum of the image obtained by averaging over a certain aperture can be used to reconstruct the spectrum of the original image. Having received the inverse Fourier transform from it, it is possible to obtain the original image. With an increase in the spatial resolution it becomes possible to carry out studies by methods of digital holography of volumetric diffuse objects while retaining the quality of analog holography (when recording in photographic media) and create optical superresolution systems based on optical microscopes.

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Method of Increasing the Spatial Resolution in Digital Holographic Microscopy

Cited by 5 publications

References 5 publications

Advances in Digital Holographic Interferometry

Advances in Digital Holographic Interferometry

Analog-to-digital conversion of information archived in display holograms: I. discussion

Increasing the spatial resolution of signals in optical systems

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