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Autofocus of imaging ellipsometry
Applied Optics, 2022Through polarized light interacting with samples, imaging ellipsometry is capable of aiding in the study of semitransparent biological cells microscopically; it is also possible to find applications in marker-free nondestructive disease diagnosis. Often a living biological cell is sensitive to environmental conditions, and fast
Haiyan Guo +2 more
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SAS Autofocus Based on Phase Gradient Autofocus
2011 Fourth International Workshop on Chaos-Fractals Theories and Applications, 2011Phase gradient autofocus (PGA) is widely used in spotlight SAR autofocus with strong robustness. However, being the different nature of synthetic aperture sonar (SAS) imagery, traditional PGA algorithm usually fails to yield satisfactory result on SAS image without modification. Three measures are taken to ensure that PGA can be applied in stripmap SAS
Sanwen Zhu, Jianping Yue, Weitao Jiang
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2011 IEEE Workshop on Applications of Computer Vision (WACV), 2011
All-in-focus imaging is a computational photography technique that produces images free of defocus blur by capturing a stack of images focused at different distances and merging them into a single sharp result. Current approaches assume that images have been captured offline, and that a reasonably powerful computer is available to process them.
Daniel Vaquero +4 more
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All-in-focus imaging is a computational photography technique that produces images free of defocus blur by capturing a stack of images focused at different distances and merging them into a single sharp result. Current approaches assume that images have been captured offline, and that a reasonably powerful computer is available to process them.
Daniel Vaquero +4 more
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Autofocus Fourier single-pixel microscopy
Optics Letters, 2023Single-pixel microscopy enables observation of micro samples in invisible wave bands. Finding the focus position is essential to capture a clear image of a sample but could be difficult for single-pixel microscopy particularly in invisible wave bands. It is because the structured patterns projected onto the sample would be invisible and searching for ...
Zilin Deng +3 more
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Journal of Microscopy, 2009
SummaryReliable autofocusing is a critical part of any automated microscopy system: by precisely positioning the sample in the focal plane, the acquired images are sharp and can be accurately segmented and quantified. The three main components of an autofocus algorithm are a contrast function, an optimization algorithm and a sampling strategy.
T, Pengo +2 more
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SummaryReliable autofocusing is a critical part of any automated microscopy system: by precisely positioning the sample in the focal plane, the acquired images are sharp and can be accurately segmented and quantified. The three main components of an autofocus algorithm are a contrast function, an optimization algorithm and a sampling strategy.
T, Pengo +2 more
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Autofocus laser rotary encoder
Applied Optics, 1998A laser incremental encoder with autofocus operation isproposed. In the encoder, an optical read head focuses three laserbeams upon a disk with a scaling grating. The scaling grating is areflection grating for which the height difference between adjacentpixels is one quarter of the wavelength of the laser. Each of thetwo laser beams is focused onto one
Zhang, JH, Cai, Lilong
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2017 6th Mediterranean Conference on Embedded Computing (MECO), 2017
The problem of autofocus in radar imaging systems is considered in this paper. It is offered to process modulus of a reflected signal to exclude phase errors from consideration. It is shown that the offered technique can work well with small resolution improvement factors. The technique is tested with modeling and real life signal processing.
Sergey Vityazev +2 more
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The problem of autofocus in radar imaging systems is considered in this paper. It is offered to process modulus of a reflected signal to exclude phase errors from consideration. It is shown that the offered technique can work well with small resolution improvement factors. The technique is tested with modeling and real life signal processing.
Sergey Vityazev +2 more
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Transionospheric Autofocus for Synthetic Aperture Radar
2023 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2023This paper presents an algorithm to mitigate the distortions caused by ionospheric turbulence on SAR space images. To quote the authors: ``In the current work, we propose a new optimization-based autofocus algorithm that helps correct the turbulence-induced distortions of spaceborne SAR images''.
Mikhail Gilman, Semyon V. Tsynkov
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Polarimetric phase gradient autofocus
2007 IEEE International Geoscience and Remote Sensing Symposium, 2007In the past decade the use of fully polarimetric SAR (polSAR) systems has increased significantly due to their effectiveness in target classification and detection applications. While polSAR imagery has been extensively used to distinguish between different scattering mechanisms in a scene, there has been a lack of research in the exploitation of ...
MARTORELLA, MARCO +3 more
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