Results 21 to 30 of about 14,909 (237)
FPGA Implementation of a SAR Two-dimensional Autofocus Approach
Leida xuebao, 2016 For real-time autofocus of defocused images produced by Synthetic Aperture Radar (SAR), the twodimensional autofocus approach proposed in this study is used to correct the residual range cell migration and compensate for the phase error.
Guo Jiangzhe, Zhu Daiyin, Mao Xinhua
doaj +1 more source
New algorithms to Enhanced Fused Images from Auto-Focus Images
مجلة بغداد للعلوم, 2021 Enhancing quality image fusion was proposed using new algorithms in auto-focus image fusion. The first algorithm is based on determining the standard deviation to combine two images.
Heba Kh. Abbas +3 more
doaj +1 more source
Robust autofocus method based on patterned active illumination and image cross-correlation analysis. [PDF]
Biomed Opt ExpressLi C +5 more
europepmc +2 more sources
Autofocus for digital Fresnel holograms by use of a Fresnelet-sparsity criterion [PDF]
, 2004 We propose a robust autofocus method for reconstructing digital Fresnel holograms. The numerical reconstruction involves simulating the propagation of a complex wave front to the appropriate distance.
Liebling, Michael, Unser, Michael
core +2 more sources
A nonquadratic regularization-based technique for joint SAR imaging and model error correction [PDF]
, 2008 Regularization based image reconstruction algorithms have successfully been applied to the synthetic aperture radar (SAR) imaging problem. Such algorithms assume that the mathematical model of the imaging system is perfectly known.
Cetin, Mujdat +3 more
core +1 more source
2020 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2020 Autofocus is an important task for digital cameras, yet current approaches often exhibit poor performance. We propose a learning-based approach to this problem, and provide a realistic dataset of sufficient size for effective learning. Our dataset is labeled with per-pixel depths obtained from multi-view stereo, following "Learning single camera depth ...
Herrmann, Charles +6 more
openaire +2 more sources
Synthetic aperture radar demonstration kit for signal processing education [PDF]
, 2007 A Synthetic Aperture Radar scale model has been developed to improve signal processing teaching. Based on low frequency ultrasound transmission, it is a low cost demonstration kit.
Besson, Olivier +4 more
core +1 more source
Seeing statistics at the upgraded 3.8m UK infrared telescope (UKIRT) [PDF]
, 2002 From 1991 until 1997, the 3.8m UK Infrared Telescope (UKIRT) underwent a programme of upgrades aimed at improving its intrinsic optical performance. This resulted in images with a FWHM of 0."17 at 2.2 um in September 1998.
Adamson, Andy J. +5 more
core +3 more sources
2022 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2022 Focus control (FC) is crucial for cameras to capture sharp images in challenging real-world scenarios. The autofocus (AF) facilitates the FC by automatically adjusting the focus settings. However, due to the lack of effective AF methods for the recently introduced event cameras, their FC still relies on naive AF like manual focus adjustments, leading ...
Lin, Shijie +5 more
openaire +2 more sources
A Novel Autofocus Measure Based on Weighted Walsh-Hadamard Transform
IEEE Access, 2019 The autofocus measure plays an important role in passive digital imaging systems. However, most of the existing methods are more sensitive to the noise. In order to overcome this drawback, we proposed a novel autofocus measure based on the weighted Walsh-
Liqiang Guo, Xiang Cao, Lian Liu
doaj +1 more source