A High-Resolution Spotlight SAR Imaging Method Based on Two-Step Processing Approach

2022 ◽  
pp. 151-161
Author(s):  
Hao Zheng ◽  
Hongmeng Chen
Keyword(s):  
High Resolution ◽  
Imaging Method ◽  
Processing Approach ◽  
Sar Imaging

scholarly journals A workflow for streamlined acquisition and correlation of serial regions of interest in array tomography

BMC Biology ◽  
2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Sergio Gabarre ◽  
Frank Vernaillen ◽  
Pieter Baatsen ◽  
Katlijn Vints ◽  
Christopher Cawthorne ◽  
...  
Keyword(s):  
High Resolution ◽  
Light And Electron Microscopy ◽  
User Interaction ◽  
Regions Of Interest ◽  
Imaging Method ◽  
Array Tomography ◽  
Reference Space ◽  
Cell Processes ◽  
Electron Microscopes ◽  
Specific Tissue

Abstract Background Array tomography (AT) is a high-resolution imaging method to resolve fine details at the organelle level and has the advantage that it can provide 3D volumes to show the tissue context. AT can be carried out in a correlative way, combing light and electron microscopy (LM, EM) techniques. However, the correlation between modalities can be a challenge and delineating specific regions of interest in consecutive sections can be time-consuming. Integrated light and electron microscopes (iLEMs) offer the possibility to provide well-correlated images and may pose an ideal solution for correlative AT. Here, we report a workflow to automate navigation between regions of interest. Results We use a targeted approach that allows imaging specific tissue features, like organelles, cell processes, and nuclei at different scales to enable fast, directly correlated in situ AT using an integrated light and electron microscope (iLEM-AT). Our workflow is based on the detection of section boundaries on an initial transmitted light acquisition that serves as a reference space to compensate for changes in shape between sections, and we apply a stepwise refinement of localizations as the magnification increases from LM to EM. With minimal user interaction, this enables autonomous and speedy acquisition of regions containing cells and cellular organelles of interest correlated across different magnifications for LM and EM modalities, providing a more efficient way to obtain 3D images. We provide a proof of concept of our approach and the developed software tools using both Golgi neuronal impregnation staining and fluorescently labeled protein condensates in cells. Conclusions Our method facilitates tracing and reconstructing cellular structures over multiple sections, is targeted at high resolution ILEMs, and can be integrated into existing devices, both commercial and custom-built systems.

scholarly journals A Novel Focus Approach for Squint Mode Multi-Channel in Azimuth High-Resolution and Wide-Swath SAR Imaging Processing

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 74303-74319 ◽  
Author(s):  
Shuang-Xi Zhang ◽  
Jia-Lian Sheng ◽  
Meng-Dao Xing
Keyword(s):  
High Resolution ◽  
Imaging Processing ◽  
Sar Imaging ◽  
Wide Swath

A Method of Dispersion Compensation Based on Warped Frequency Transform

2013 ◽  
Vol 718-720 ◽  
pp. 2062-2067 ◽  
Author(s):  
Shang Chen Fu ◽  
Zhen Jian Lv ◽  
Ding Ma ◽  
Li Hua Shi
Keyword(s):  
High Resolution ◽  
Velocity Dispersion ◽  
Lamb Waves ◽  
Group Velocity Dispersion ◽  
Dispersion Compensation ◽  
Imaging Method ◽  
Finite Element Software ◽  
Damage Imaging ◽  
Resolution Imaging ◽  
Multi Mode

The use of Lamb waves for structural health monitoring (SHM) has complicated by its multi-mode character and dispersion effect, which impacts the damage positioning and high-resolution imaging. The group velocity dispersion curves of Lamb waves can be employed to warp the frequency axis, and then to establish warped frequency transform (WFT) to process Lamb waves. In this paper, received signals are directly compensated with warped frequency transform to suppress dispersion, and a new imaging method is proposed based on warped frequency transform. The propagation of Lamb waves in damaged aluminum plate is simulated by finite element software ABAQUS, results show that warped frequency transform can effectively compensate dispersive wave-packets, and high-resolution damage imaging can be obtained by the proposed method.

A SAR Imaging Method for Walking Human Based on m ωka-FrFT-mmGLRT

2021 ◽  
pp. 1-12
Author(s):  
Shuliang Gui ◽  
Jin Li ◽  
Yue Yang ◽  
Feng Zuo ◽  
Yiming Pi
Keyword(s):  
Imaging Method ◽  
Sar Imaging
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