Results 21 to 30 of about 278,785 (319)
Mitigating susceptibility-induced distortions in high-resolution 3DEPI fMRI at 7T
NeuroImage, 2023 Geometric distortion is a major limiting factor for spatial specificity in high-resolution fMRI using EPI readouts and is exacerbated at higher field strengths due to increased B0 field inhomogeneity.
Vahid Malekian +8 more
doaj +1 more source
Parameter-free radial distortion correction with centre of distortion estimation [PDF]
Tenth IEEE International Conference on Computer Vision (ICCV'05) Volume 1, 2005 We propose a method of simultaneously calibrating the radial distortion function of a camera and the other internal calibration parameters. The method relies on the use of a planar (or, alternatively, nonplanar) calibration grid which is captured in several images. In this way, the determination of the radial distortion is an easy add-on to the popular
Hartley, Richard, Kang, Sing Bing
openaire +3 more sources
Compensation for phase distortions in nonlinear media by phase conjugation [PDF]
, 1980 We demonstrate theoretically that the distortion-correction property of phase-conjugate beams propagating in reverse through aberrating media is also operative when the indices of refraction of the media depend on the intensity.
Pepper, David M., Yariv, Amnon
core +1 more source
Distortion correction in EPI using an extended PSF method with a reversed phase gradient approach. [PDF]
PLoS ONE, 2015 In echo-planar imaging (EPI), such as commonly used for functional MRI (fMRI) and diffusion-tensor imaging (DTI), compressed distortion is a more difficult challenge than local stretching as spatial information can be lost in strongly compressed areas ...
Myung-Ho In +4 more
doaj +1 more source
Segregation distortion: Utilizing simulated genotyping data to evaluate statistical methods.
PLoS ONE, 2020 Segregation distortion is the phenomenon in which genotypes deviate from expected Mendelian ratios in the progeny of a cross between two varieties or species.
Alexander Coulton +5 more
doaj +1 more source
Marine Application Evaluation of Monocular SLAM for Underwater Robots
Sensors, 2022 With the development of artificial intelligence technology, visual simultaneous localization and mapping (SLAM) has become a cheap and efficient localization method for underwater robots.
Yang Zhang +4 more
doaj +1 more source
Distortion-correcting holographic resonators
SPIE Proceedings, 2000 High phase conjugate reflectivities (R > 10,000%) have been achieved through degenerate four-wave mixing in a cw diode-side-pumped Nd:YVO4 amplifier and the interactions have been successfully modelled. This four-wave mixing geometry has subsequently been used in the design of a phase-conjugate resonator operating with a single-longitudinal mode TEMoo ...
Hendricks, J. +7 more
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Distortion correction of single-shot EPI enabled by deep-learning
NeuroImage, 2020 Purpose: A distortion correction method for single-shot EPI was proposed. Point-spread-function encoded EPI (PSF-EPI) images were used as the references to correct traditional EPI images based on deep neural network.
Zhangxuan Hu +7 more
doaj +1 more source
Minor Distortions with Major Consequences: Correcting Distortions in Imaging Spectrographs [PDF]
Applied Spectroscopy, 2011 Projective transformation is a mathematical correction (implemented in software) used in the remote imaging field to produce distortion-free images. We present the application of projective transformation to correct minor alignment and astigmatism distortions that are inherent in dispersive spectrographs. Patterned white-light images and neon emission
Francis W L, Esmonde-White +2 more
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Soft-photon corrections in multi-body meson decays [PDF]
, 2007 The effects due to soft-photon emission (and the related virtual corrections) in multi-body decays of B, D, and K mesons are analysed. We present analytic expressions for the universal O(alpha) correction factors which can be applied to all multi-body ...
C. Gatti +17 more
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