Results 21 to 30 of about 21,693,337 (313)
Recurrence Quantification Analysis as a Post-processing Technique in Adaptive Optics High-contrast Imaging [PDF]
The Astrophysical Journal, 2018 Abstract In this work we explore the possibility of using recurrence quantification analysis (RQA) in astronomical high-contrast imaging to statistically discriminate the signal of faint objects from speckle noise. To this end, we tested RQA on a sequence of high frame rate (1 kHz) images acquired with the SHARK-VIS forerunner at the ...
M. Stangalini +10 more
openaire +2 more sources
Focusing with planar microlenses made of two-dimensionally varying high contrast gratings [PDF]
, 2014 The authors thank the European Union for the financial support through Marie Curie Action FP7-PEOPLE-2010-ITN Project No. 264687 “PROPHET”.We report on the focusing performance of reflective two-dimensionally varying high contrast grating lenses based on
Krauss, T.F. +5 more
core +1 more source
Binocular interaction: contrast matching and contrast discrimination are predicted by the same model [PDF]
, 2007 How do signals from the 2 eyes combine and interact? Our recent work has challenged earlier schemes in which monocular contrast signals are subject to square-law transduction followed by summation across eyes and binocular gain control.
Tim S. Meese +11 more
core +1 more source
Minimizing contrast media dose in CT pulmonary angiography with high-pitch technique
The British Journal of Radiology, 2020 Objectives: To perform CT pulmonary angiography (CTPA) using a minimal amount of iodinated contrast media. Methods: 47 patients (25 females) with mean age 69 years (range 41–82 years) referred for contrast-enhanced chest CT were prospectively ...
Hanan Alobeidi +4 more
openaire +2 more sources
European Journal of Radiology Open, 2020 Flow-independent relaxation-based non-contrast MR angiography techniques yield good signal-to-noise ratio and high blood-tissue contrast, complementing non-contrast flow-dependent and contrast-enhanced MR angiography techniques in the assessment of ...
Eu Jin Tan +3 more
doaj +1 more source
Keck Primary Mirror Closed-loop Segment Control Using a Vector-Zernike Wavefront Sensor
The Astrophysical JournalWe present the first on-sky segmented primary mirror closed-loop piston control using a Zernike wavefront sensor (ZWFS) installed on the Keck II telescope.
Maïssa Salama +19 more
doaj +1 more source
Ultramicroscopy, 2017 High-quality image reconstruction techniques allow the generation of high pixel density images from a set of low-resolution micrographs. In general, these techniques consist of two main steps, namely, accurate registration, and formulation of an appropriate forward image model via some restoration method.
Barcena González, Guillermo +6 more
openaire +3 more sources
Pediatric Blood &Cancer, EarlyView.ABSTRACT Pediatric gastroenteropancreatic neuroendocrine neoplasms (GEP‐NENs) are extremely rare and clinically heterogeneous. Management has largely been extrapolated from adult practice. This European Standard Clinical Practice Guideline (ESCP), developed by the EXPeRT network in collaboration with adult NEN experts, provides (adult) evidence ...
Michaela Kuhlen +23 more
wiley +1 more source
A Multiband Study of the HR 4796A Disk in the Optical Using MagAO-X
The Astrophysical JournalWe present total intensity images of the debris disk around HR 4796A from observations spanning 2023 to 2025 with the Magellan extreme adaptive optics instrument (MagAO-X).
Jay K. Kueny +20 more
doaj +1 more source
Automatic image equalization and contrast enhancement using Gaussian mixture modeling [PDF]
, 2012 In this paper, we propose an adaptive image equalization algorithm that automatically enhances the contrast in an input image. The algorithm uses the Gaussian mixture model to model the image gray-level distribution, and the intersection points of the ...
Tjahjadi, Tardi +3 more
core +1 more source