Results 11 to 20 of about 2,554 (206)
A New Autofocusing Method Based on Brightness and Contrast for Color Cameras
Advances in Electrical and Computer Engineering, 2016 The autofocusing is one of the most important features of imaging devices. This feature directly affects the quality of the image taken by the imaging device. Currently, many studies are being performed to improve the feature of autofocusing.
SELEK, M.
doaj +2 more sources
SPA-GAN: SAR Parametric Autofocusing Method with Generative Adversarial Network
Remote Sensing, 2022 Traditional synthetic aperture radar (SAR) autofocusing methods are based on the point-scattering model, which assumes the scattering phases of a target to be a constant.
Zegang Ding +6 more
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Graphics processing unit (GPU) aided wavefront-based autofocusing in microscopy
AIP Advances, 2018 Based on the wavefront sensing and propagation, the wavefront-based autofocus approach is proposed for potentially adopted in rapid autofocusing since it can precisely locate the focal plane but only requiring much fewer multi-focal image captures ...
Zhilong Jiang +4 more
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Laser autofocusing: A sliding mode approach [PDF]
IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society, 2010 Quality of the laser processing depends on many factors, such as overall configuration of the laser workstation, control methods used and quality of the laser beam. Although lasers used in material processing are typically high energy lasers, light beam still needs to be focused in order to achieve higher energy density and smaller final spot size ...
Golubovic, Edin +3 more
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Observation of abruptly autofocusing waves
Optics Letters, 2011 We report on the experimental observation of abruptly autofocusing waves. This interesting family of wave packets has been realized by using a radially symmetric Airy intensity distribution. As demonstrated in our experiments, these waves can exhibit unusual features, such as the ability to autofocus by following a parabolic trajectory toward their ...
Papazoglou, Dimitrios G. +3 more
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Sparse Regularization with a Non-Convex Penalty for SAR Imaging and Autofocusing
Remote Sensing, 2022 In this paper, SAR image reconstruction with joint phase error estimation (autofocusing) is formulated as an inverse problem. An optimization model utilising a sparsity-enforcing Cauchy regularizer is proposed, and an alternating minimization framework ...
Zi-Yao Zhang +3 more
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Edge-Preserving Autofocusing in Digital Holography
Digital Holography and Three-Dimensional Imaging, 2016 In digital holography, it is essential to know the axial position of the recorded object for reconstruction. Here we propose an autofocusing algorithm using structure tensor to determine the focal distance and to extract the edge information.
Ren, Z, Lam, EYM
openaire +3 more sources
Pre-engineered abruptly autofocusing beams [PDF]
Optics Letters, 2011 We introduce a new family of (2+1)D light beams with pre-engineered abruptly autofocusing properties. These beams have a circularly symmetric input profile that develops outward of a dark disk and oscillates radially as a sublinear-chirp signal, creating a series of concentric intensity rings with gradually decreasing width.
Chremmos, Ioannis +2 more
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Passive Autofocusing System for a Thermal Camera [PDF]
IEEE Access, 2020 Most of the Thermal (Infrared) cameras nowadays are equipped with a motorized lens for focusing a scene manually. The subjective nature of manual focusing makes it an inefficient and cumbersome process.
Rashid Ali +6 more
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Autofocusing and self-healing of partially blocked circular Airy derivative beams [PDF]
, 2023 We numerically and experimentally study the autofocusing and self-healing of partially blocked circular Airy derivative beams (CADBs). The CADB consists of multiple rings, and partial blocking of CADB with different kinds is achieved by using symmetric ...
Vasu Dev (14356743) +2 more
core +2 more sources