Search results for "Filter"

Full-parallax 3D display from the hole-filtered depth information

2015

In this paper we introduce an efficient hole-filling algorithm for synthetic generation of microimages that are displayed on an integral imaging monitor. We apply the joint bilateral filter and the median filter to the captured depth map. We introduce in any step of the iterative algorithm with the data from a new Kinect capture. As a result, this algorithm can improve the quality of the depth maps and remove unmeasured depth holes effectively. This refined depth information enables to create a tidy integral image, which can be projected into an integral imaging monitor. In this way the monitor can display 3D images with continuous views, full parallax and abundant 3D reconstructed scene fo…

Solar blind AlGaN photodetectors with a very high spectral selectivity

2006

Solar blind detectors based on AlGaN heterostructures grown on sapphire by Molecular Beam Epitaxy and with a dielectric interference filter deposited on the back side are demonstrated to provide record spectral selectivity. Rejection ratios of 2 x 10(4), and better than 5 x 10(4), measured between 280 and 320 nm, are achieved in Metal Semiconductor Metal detectors and Schottky diodes respectively. The whole detector process is fully compatible with low cost array fabrication.

Filtering out intersymbol interference in spread-spectrum communication systems

1979

In this letter the transfer characteristic of the optimum filter suitable for eliminating intersymbol interference in pseudo-noise spread-spectrum communication systems is determined. Such a characteristic is independent of the code sequence employed.

Acs aberāciju un gaismas izkliedes ietekme uz redzes kvalitāti.

2020

Darbs ir uzrakstīts angļu valodā 66 lapām. Tā satur 33 attēlus, 3 tabulas, 8 grafiki un 121 atsauces uz literatūras avotiem. Mērķis. Izpētīt saistību starp cilvēka redzi un acs iekšējo gaismas izkliedi un mēģināt saprast, vai intraokulārā gaismas izkliede ietekmē acs aberācijas. Izpētīta Strehl koeficientu normalitāte. Metodes. Redzes asumu un jutīgumu pret kontrastu novērtē parastā stāvoklī un ar 3 dažādiem izkliedes filtriem 10 jaunu un veselīgu acu grupai. Pašizveidota modeļa acs viļņu frontes kļūdas tiek izmeklētas ar izkliedes filtriem un bez tiem. Rezultāti. Redzes asums un jutība pret kontrastu ir sliktāka, ja izkliedēšanas filtri tiek novietoti subjekta acu priekšā (p <.05). VA iete…

Advanced techniques for solving groundwater and surface water problems in the context of inverse methods and climate change.

2021

[ES] El tema de la investigación se centra en técnicas avanzadas para manejar problemas de aguas subterráneas y superficiales relacionados con métodos inversos y cambio climático. Los filtros de Kalman, con especial atención en Ensemble Smoother with Multiple Data Assimilation (ES-MDA), se analizan y mejoran para la solución de diferentes tipos de problemas inversos. En particular, la principal novedad es la aplicación de estos métodos para la identificación de series temporales. La primera parte de la tesis, luego de la descripción del método, presenta el desarrollo de un software escrito en Python para la aplicación de la metodología propuesta. El software cuenta con un flujo de trabajo f…

Algorithms for rational discrete least squares approximation

1975

In this paper an algorithm for the computation of a locally optimal polefree solution to the discrete rational least squares problem under a mild regularity condition is presented. It is based on an adaptation of projection methods [8], [12], [13], [14], [18], [19] to the modified Gaus-Newton method [4], [10]. A special device makes possible the direct handling of the infinitely many linear constraints present in this problem.

Sequential Monte Carlo methods in Bayesian joint models for longitudinal and time-to-event data

2017

El análisis estadístico de la información generada por el seguimiento médico de una enfermedad es un reto muy importante en el ámbito de la medicina personalizada. A medida que avanza el curso evolutivo de la enfermedad en un paciente, su seguimiento genera cada vez más información que debe ser procesada inmediatamente para revisar y actualizar su pronóstico y tratamiento. Nuestro objetivo en esta tesis se centra en dicho proceso de actualización a través de métodos de inferencia secuencial en modelos conjuntos de datos longitudinales y de supervivencia desde una perspectiva Bayesiana. En concreto, proponemos la utilización de métodos secuenciales de Monte Carlo adaptados a modelos conjunto…

KALMAN FILTERS FOR GNSS APPLICATIONS

2011

Is it possible to define a fully digital state model for Kalman filtering?

2010

Localization in Structured Environments with UWB Devices without Acceleration Measurements, and Velocity Estimation Using a Kalman–Bucy Filter

2022

In this work, a novel scheme for velocity and position estimation in a UWB range-based localization system is proposed. The suggested estimation strategy allows to overcome two main problems typically encountered in the localization systems. The first one is that it can be suitable for use in environments where the GPS signal is not present or where it might fail. The second one is that no accelerometer measurements are needed for the localization task. Moreover, to deal with the velocity estimation problem, a suitable Kalman–Bucy filter is designed and it is compared, experimentally, with a particle filter by showing the features of the two algorithms in order to be used in a localization …