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   Articles with "autofocus" as a keyword



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A large-range autofocus microwave photonic radar based on adaptive spatial filtering along the range direction

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recommendations! Published in 2020 at "Optics Communications"

DOI: 10.1016/j.optcom.2020.126354

Abstract: Abstract A large-range autofocus microwave photonic radar based on adaptive spatial filtering along the range direction is proposed to achieve high-resolution imaging of the target at any distance. By firstly estimating the target distance and… read more here.

Keywords: large range; high resolution; radar; microwave photonic ... See more keywords

Efficient ISAR Autofocus Technique Using Eigenimages

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recommendations! Published in 2017 at "IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing"

DOI: 10.1109/jstars.2016.2602378

Abstract: In this paper, we propose a new and efficient inverse synthetic aperture radar (ISAR) autofocus technique by introducing eigenimages to boost the speed of the traditional autofocus algorithms. First, a preprocessing step is applied to… read more here.

Keywords: isar autofocus; autofocus technique; traditional autofocus; autofocus ... See more keywords

An Azimuth-Variant Autofocus Scheme of Bistatic Forward-Looking Synthetic Aperture Radar

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recommendations! Published in 2017 at "IEEE Geoscience and Remote Sensing Letters"

DOI: 10.1109/lgrs.2017.2671879

Abstract: In bistatic forward-looking synthetic aperture radar (BFSAR), conventional autofocus algorithms cannot estimate the phase errors accurately when the range walk is compensated in the azimuthal time domain. This problem stems from the influence of the… read more here.

Keywords: looking synthetic; forward looking; autofocus; azimuth variant ... See more keywords

Efficient ISAR Phase Autofocus Based on Eigenvalue Decomposition

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recommendations! Published in 2017 at "IEEE Geoscience and Remote Sensing Letters"

DOI: 10.1109/lgrs.2017.2746758

Abstract: Phase autofocus is a key step in translational motion compensation for inverse synthetic aperture radar. From the eigenvalue decomposition (EVD) of the covariance matrix generated by the aligned range-compressed signal, eigenvectors can be obtained for… read more here.

Keywords: phase autofocus; evd; eigenvalue decomposition; autofocus ... See more keywords

Robust ISAR Autofocus for Nonuniformly Rotating Target

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recommendations! Published in 2025 at "IEEE Transactions on Aerospace and Electronic Systems"

DOI: 10.1109/taes.2025.3550462

Abstract: When a target undergoes complex maneuvers, the resulting inverse synthetic aperture radar (ISAR) image will exhibit significant distortion due to the nonuniform rotational motion. To address this issue, we present a highly effective ISAR autofocus… read more here.

Keywords: nonuniformly rotating; image; target; isar ... See more keywords

AFnet and PAFnet: Fast and Accurate SAR Autofocus Based on Deep Learning

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recommendations! Published in 2022 at "IEEE Transactions on Geoscience and Remote Sensing"

DOI: 10.1109/tgrs.2022.3217063

Abstract: Autofocus plays a key role in synthetic aperture radar (SAR) imaging, especially for high-resolution imaging. In the literature, the minimum-entropy-based algorithms (MEA) have been proven to be robust and have been widely applied in SAR.… read more here.

Keywords: pafnet fast; afnet pafnet; autofocus; deep learning ... See more keywords

Two-Dimensional Autofocus Technique Based on Spatial Frequency Domain Fragmentation

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recommendations! Published in 2020 at "IEEE Transactions on Image Processing"

DOI: 10.1109/tip.2020.2988143

Abstract: Existing two-dimensional (2D) autofocus algorithms, exploiting the known structure of 2D phase error, lack the error estimation accuracy in the case of a low signal-to-noise ratio (SNR) due to the non-exhaustive use of the echo… read more here.

Keywords: dimensional autofocus; autofocus technique; frequency; autofocus ... See more keywords

Two-stage autofocus algorithm with filled function for synthetic aperture radar

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recommendations! Published in 2020 at "Journal of Applied Remote Sensing"

DOI: 10.1117/1.jrs.14.026512

Abstract: Abstract. Entropy-based parametric autofocus is commonly applied to correct the residual azimuth phase error (APE) that arises from the residual motion errors (RME) in synthetic aperture radar. However, the image’s entropy trends to a convex… read more here.

Keywords: synthetic aperture; autofocus; aperture radar; stage ... See more keywords

Autofocus method based on frequency domain cross-correlation in a structured illumination microscopy.

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recommendations! Published in 2025 at "Applied optics"

DOI: 10.1364/ao.564487

Abstract: Precise focusing is a challenge for live-cell super-resolution structured illumination microscopy (SR-SIM), especially in the case of low signal-to-noise ratio of raw images. Here, we propose an integrated autofocus algorithm (IT-SICC) that combines frequency domain… read more here.

Keywords: structured illumination; method; domain cross; illumination microscopy ... See more keywords

Optical camera with liquid crystal autofocus lens.

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recommendations! Published in 2017 at "Optics express"

DOI: 10.1364/oe.25.029945

Abstract: A mobile phone camera with an innovative electrically tunable liquid crystal lens (TLCL) concept is demonstrated. We first report the comparative theoretical and experimental analyses of the performance of a traditional "modal control" TLCL versus… read more here.

Keywords: camera; liquid crystal; optical camera; autofocus ... See more keywords

Fast image-free autofocus method for passive FSPI microscopy.

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recommendations! Published in 2024 at "Optics letters"

DOI: 10.1364/ol.516755

Abstract: Autofocus is crucial for capturing sharp images with imaging devices for information acquisition. Traditional autofocus strategies based on post-processing become less efficient for passive FSPI microscopy of yet low temporal resolution. In this Letter, a… read more here.

Keywords: fspi microscopy; passive fspi; fast image; autofocus ... See more keywords