Results 31 to 40 of about 14,909 (237)
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
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
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
doaj +1 more source
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
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
doaj +1 more source
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
Exploiting Loops in the Camera Array for Automatic Focusing Depth Estimation
International Journal of Advanced Robotic Systems, 2013 Autofocus is a fundamental and key problem for modern imaging sensor design. Although this problem has been well studied in single camera literature, unfortunately, little research has been done on large-scale camera arrays.
Tao Yang +3 more
doaj +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
doaj +1 more source
Autofocus in infrared microscopy [PDF]
2018 IEEE 23rd International Conference on Emerging Technologies and Factory Automation (ETFA), 2018 Autofocus (AF) is a widely investigated subject in the fields of natural scene images, industrial assembly and biologic microscopy. This paper proposes a new effective AF method for infrared (IR) microscopy in the context of the Integrated Circuit industry (IC).
Raphael Abele +5 more
openaire +1 more source