Results 21 to 30 of about 13,506 (143)
Applied Sciences, 2020 This study proposed the concept of sparse and low-rank matrix decomposition to address the need for aviator’s night vision goggles (NVG) automated inspection processes when inspecting equipment availability.
Bo-Lin Jian +3 more
doaj +1 more source
Applied Sciences, 2021 The intelligent recognition of formed elements in microscopic images is a research hotspot. Whether the microscopic image is clear or blurred is the key factor affecting the recognition accuracy.
Xiangzhou Wang +5 more
doaj +1 more source
Micromachines, 2022 For many parasitic diseases, the microscopic examination of clinical samples such as urine and stool still serves as the diagnostic reference standard, primarily because microscopes are accessible and cost-effective.
Prosper Oyibo +10 more
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Automatic refocus and feature extraction of single-look complex SAR signatures of vessels [PDF]
, 2016 In recent years, spaceborne synthetic aperture radar ( SAR) technology has been considered as a complement to cooperative vessel surveillance systems thanks to its imaging capabilities.
Mallorquí Franquet, Jordi Joan +1 more
core +2 more sources
Design and Experimental Validation of an Optical Autofocusing System with Improved Accuracy
Photonics, 2023 This study proposes a modified optical design to improve the issue of autofocus accuracy in existing optical systems. The proposed system uses lens offset to convert incident light into non-parallel light, achieving a focus shift and avoiding severe ...
Jui-Hsiang Hung +3 more
doaj +1 more source
An augmented Lagrangian method for autofocused compressed SAR imaging [PDF]
, 2015 We present an autofocus algorithm for Compressed SAR Imaging. The technique estimates and corrects for 1-D phase errors in the phase history domain, based on prior knowledge that the reflectivity field is sparse, as in the case of strong scatterers ...
Cetin, Mujdat +5 more
core +1 more source
Improved entropy-based autofocus correction for synthetic aperture radar
The Journal of Engineering, 2019 Autofocus is an essential step in order to obtain the well-focused synthetic aperture radar image. Compared to the non-parametric autofocus, the parametric way is not subjected to the prominent targets so much.
Qianrong Lu +3 more
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Modulation Linearization Technique for FM/CW SAR Image Processing Using Range Migration
Applied Sciences, 2021 Linear FMCW radar suffers from impairments in range and range rate if there are errors in the modulation rate or phase discontinuities. Often, this is a result of a nonlinearity of the voltage-controlled oscillator that is in the source of the transmit ...
Theodore Grosch, Cyril Okhio
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Autofocus and analysis of geometrical errors within the framework of fast factorized back-projection [PDF]
, 2014 This paper describes a Fast Factorized Back-Projection (FFBP) formulation that includes a fully integrated autofocus algorithm, i.e. the Factorized Geometrical Autofocus (FGA) algorithm. The base-two factorization is executed in a horizontal plane, using
Dämmert, P.B.G. +3 more
core +1 more source
Simplified and approximation autofocus back-projection algorithm for SAR
The Journal of Engineering, 2019 Due to accuracy limited inertial measurement unit systems, residual synthetic aperture radar (SAR) motion errors need to be compensated by autofocus method. Back-projection (BP) algorithm is a time-domain imaging process suitable for arbitrary trajectory
Zhenyu Guo, Hongbo Zhang, Shaohua Ye
doaj +1 more source