Search results for "Imatges"
showing 8 items of 68 documents
A Mumford-Shah functional based variational model with contour, shape, and probability prior information for prostate segmentation
2012
Abstract: Inter patient shape, size and intensity variations of the prostate in transrectal ultrasound (TRUS) images challenge automatic segmentation of the prostate. In this paper we propose a variational model driven by Mumford-Shah (MS) functional for segmenting the prostate. Parametric representation of the implicit curve is derived from principal component analysis (PCA) of the signed distance representation of the labeled training data to impose shape prior. Posterior probability of the prostate region determined from random forest classification facilitates initialization and propagation of our model in a MS energy minimization framework. The proposed method achieves mean Dice simila…
La Concepción de María en el tiempo. Recuperación de fórmulas tempranas de representación de la Inmaculada Concepción en la retórica visual del virre…
2014
This paper addresses a genuine aspect of conceptionist visual rhetoric during the Viceroyalty of New Spain: the recycling of Immaculate Conception earlier types of representation that, with the consolidation of the image of the Immaculate derived from the Tota Pulchra, had fallen deprecated in the peninsular art. The tendency of artists and patrons towards these typologies reveals a key aspect to understand the definition of Hispanic culture during the centuries of the Baroque. In the peripheral areas of the Empire, instead of continuous affirmation of the existence of a single Hispanic world, the springs of control over the religious image allowed variability in the implementation of the C…
Bathymetry time series using high spatial resolution satellite images
2020
The use of the new generation of remote sensors, such as echo sounders and Global Navigation Satellite System (GNSS) receivers with differential correction installed in a drone, allows the acquisition of high-precision data in areas of shallow water, as in the case of the channel of the Encañizadas in the Mar Menor lagoon. This high precision information is the first step to develop the methodology to monitor the bathymetry of the Mar Menor channels. The use of high spatial resolution satellite images is the solution for monitoring many hydrological changes and it is the basis of the three-dimensional (3D) numerical models used to study transport over time, environmental variability, and wa…
Non-invasive Spatial Mapping of Frequencies in Atrial Fibrillation: Correlation With Contact Mapping
2021
[EN] Introduction: Regional differences in activation rates may contribute to the electrical substrates that maintain atrial fibrillation (AF), and estimating them non-invasively may help guide ablation or select anti-arrhythmic medications. We tested whether non-invasive assessment of regional AF rate accurately represents intracardiac recordings. Methods: In 47 patients with AF (27 persistent, age 63 +/- 13 years) we performed 57-lead non-invasive Electrocardiographic Imaging (ECGI) in AF, simultaneously with 64-pole intracardiac signals of both atria. ECGI was reconstructed by Tikhonov regularization. We constructed personalized 3D AF rate distribution maps by Dominant Frequency (DF) ana…
What we learn about bipolar disorder from large-scale neuroimaging
2020
Abstract MRI‐derived brain measures offer a link between genes, the environment and behavior and have been widely studied in bipolar disorder (BD). However, many neuroimaging studies of BD have been underpowered, leading to varied results and uncertainty regarding effects. The Enhancing Neuro Imaging Genetics through Meta‐Analysis (ENIGMA) Bipolar Disorder Working Group was formed in 2012 to empower discoveries, generate consensus findings and inform future hypothesis‐driven studies of BD. Through this effort, over 150 researchers from 20 countries and 55 institutions pool data and resources to produce the largest neuroimaging studies of BD ever conducted. The ENIGMA Bipolar Disorder Workin…
Mapping productivity and essential biophysical parameters of cultivated tropical grasslands from sentinel-2 imagery.
2020
Nitrogen (N) is the main nutrient element that maintains productivity in forages
¿Un cambio climático? Una aproximación al paisaje artístico antes y después de la revuelta de las Germanías
2020
Este trabajo ofrece una sucinta revisión y un balance provisional de cómo ha tratado la historiografía el movimiento de las Germanías de Valencia (1519-1522) como condicionante de la actividad artística en la primera mitad del siglo XVi, época de notorios cambios en el lenguaje y la práctica de los oficios y en las obras promovidas por sujetos e instituciones del reino de Valencia. Sin pretensión de exhaustividad, la exposición deja en segundo plano las cuestiones de estilo para enmarcar algunas manifestaciones arquitectónicas y artísticas en las que incidió la revuelta y la alteración de la convivencia social entre la segunda y la tercera década del siglo XVI. HAR 2017-88707-P
A Multi-Projector Calibration Method for Virtual Reality Simulators with Analytically Defined Screens
2017
The geometric calibration of projectors is a demanding task, particularly for the industry of virtual reality simulators. Different methods have been developed during the last decades to retrieve the intrinsic and extrinsic parameters of projectors, most of them being based on planar homographies and some requiring an extended calibration process. The aim of our research work is to design a fast and user-friendly method to provide multi-projector calibration on analytically defined screens, where a sample is shown for a virtual reality Formula 1 simulator that has a cylindrical screen. The proposed method results from the combination of surveying, photogrammetry and image processing approac…