Search results for " Anàlisi de"
showing 8 items of 8 documents
Integral imaging with Fourier-plane recording
2017
Integral Imaging is well known for its capability of recording both the spatial and the angular information of threedimensional (3D) scenes. Based on such an idea, the plenoptic concept has been developed in the past two decades, and therefore a new camera has been designed with the capacity of capturing the spatial-angular information with a single sensor and after a single shot. However, the classical plenoptic design presents two drawbacks, one is the oblique recording made by external microlenses. Other is loss of information due to diffraction effects. In this contribution report a change in the paradigm and propose the combination of telecentric architecture and Fourier-plane recordin…
Fast and robust phase-shift estimation in two-dimensional structured illumination microscopy.
2019
A method of determining unknown phase-shifts between elementary images in two-dimensional Structured Illumination Microscopy (2D-SIM) is presented. The proposed method is based on the comparison of the peak intensity of spectral components. These components correspond to the inherent structured illumination spectral content and the residual compo- nent that appears from wrongly estimated phase-shifts. The estimation of the phase-shifts is carried out by finding the absolute maximum of a function defined as the normalized peak intensity difference in the Fourier domain. This task is performed by an optimization method providing a fast estimation of the phase-shift. The algorithm stability an…
Machine Learning-Based View Synthesis in Fourier Lightfield Microscopy
2022
Current interest in Fourier lightfield microscopy is increasing, due to its ability to acquire 3D images of thick dynamic samples. This technique is based on simultaneously capturing, in a single shot, and with a monocular setup, a number of orthographic perspective views of 3D microscopic samples. An essential feature of Fourier lightfield microscopy is that the number of acquired views is low, due to the trade-off relationship existing between the number of views and their corresponding lateral resolution. Therefore, it is important to have a tool for the generation of a high number of synthesized view images, without compromising their lateral resolution. In this context we investigate h…
Optical sectioning with a Wiener-like filter in Fourier integral imaging microscopy
2018
Non-scanning, single-shot, 3D integral microscopy with optical sectioning is presented. The method is based on the combination of Fourier-mode integral microscopy with a 3D deconvolution technique. Specifically, the refocused volume provided by a regular back-projection algorithm is 3D deconvolved with a synthetic 3D impulse response function that takes into account the number and positions of the elemental images. The use of this hybrid technique provides a stack of true-color depth-refocused images with significant gain of optical sectioning. The stack can be used, among other applications, to inspect inside the thick microscope specimen, to calculate collections of perspective views wit…
Fast and robust wave optics-based reconstruction protocol for Fourier lightfield microscopy
2023
Fourier lightfield microscopy (FLMic) is a powerful technique to record 3D images of thick dynamic samples. Belonging FLMic to the general class of computational imaging techniques, its efficiency is determined by several factors, like the optical system, the calibration process, the reconstruction algorithm, or the computation architecture. In the case of FLMic the calibration and the reconstruction algorithm should be fully adapted to the singular features of the technique. To this end, and concerning the reconstruction, we discard the use of experimental PSFs, and propose the use of a synthetic one, which is calculated on the basis of paraxial optics and taking into account the equal inf…
Pràctiques de recursos humans, clima laboral i resultats de gestió. Anàlisi del cas "Verdifresh"
2012
La crisi econòmica mundial obliga cada empresa a lliurar una batalla, a vegades amb si mateixa, per incrementar la seua competitivitat. Cada vegada més, les organitzacions són conscients de la necessitat de comptar amb treballadors alineats amb la seua estratègia. Per aconseguir-ho, algunes empreses s'esforcen a humanitzar les relacions laborals i redissenyar les seues pràctiques de gestió de recursos humans (RH). En aquest estudi s'analitza el cas de l'empresa Verdifresh. Les seues pràctiques de RH s'han dissenyat amb l'objectiu de fidelitzar els treballadors i millorar la seua percepció de les condicions laborals. En aquest treball s'analitzen aquest tipus de relacions i es descriuen les …
Gènere i diversitat sexual en la literatura infantil valenciana del segle XXI: una anàlisi dels materials literaris a l'aula d'educació infantil
2017
Aquesta investigació parteix d’una perspectiva didàctica: com a docents de literatura en una Facultat de Magisteri hem observat la falta de diversitat en els models familiars i afectius de les obres amb què els nostres infants es troben per primera vegada amb el món de la literatura. Igualment, hem observat com diversos estereotips referits al gènere, als rols en l’interior de les famílies, a les ocupacions o a la manera en què el gènere s’expressa a si mateix. En aquest article abordem la producció editorial valenciana per a primers lectors, i analitzem les estructures familiars i el tractament dels rols dels sues membres.
Els marcadors pragmàtics compostos en el relat oral anglès i català
2001
Pragmatic markers are linguistic units that the speaker uses to organize, recover, reformulate and segment the information that s/he supplies to the hearer. They are a feature of oral rather than written discourse. They have little or no propositional meaning. By means of pragmatic markers, the speaker transmits intentions, actions, and thoughts. They help to make a text coherent in as much as they are cues that facilitate the cognitive processing of information and constrain inferences and presuppositions. They are multifunctional, operating at several discourse levels simultaneously: sequential, rhetorical and ideational (Redeker 1990). Their omission involves a violation of gricean coope…