Search results for "Methodologie"
showing 10 items of 2141 documents
Review on Machine Learning Based Lesion Segmentation Methods from Brain MR Images
2016
Brain lesions are life threatening diseases. Traditional diagnosis of brain lesions is performed visually by neuro-radiologists. Nowadays, advanced technologies and the progress in magnetic resonance imaging provide computer aided diagnosis using automated methods that can detect and segment abnormal regions from different medical images. Among several techniques, machine learning based methods are flexible and efficient. Therefore, in this paper, we present a review on techniques applied for detection and segmentation of brain lesions from magnetic resonance images with supervised and unsupervised machine learning techniques.
A LiDAR Prototype with Silicon Photomultiplier and MEMS Mirrors
2018
In this paper, we present a low cost prototype of a Time-Of-Flight (TOF) LiDAR system, employing a SiPM as photo detector and MEMS mirrors in order to steer the nanosecond pulsed optical beam with a scanning angle of +/-6°. Preliminary TOF measurements have been performed both indoor and outdoor to test the limits of the system.
Implementations of a novel algorithm for colour constancy
1997
AbstractIn agreement with the principles of the relativistic model proposed by Creutzfeldtet al., with the photometric rule (lightness anchoring rule) and with the influence of simultaneous contrast in the appearance of a visual scene, we propose a first-stage mechanism yielding substantial colour constancy. We have defined a set of first-stage colour descriptors, and to test their utility, we have performed a simulation using a Machine Vision System (MVS). The statistical stability of the descriptors for Munsell samples under different illuminants is good.
The problem of spatial homogeneity in an LCoS projector
2019
Abstract Video projectors allow interesting applications in vision sciences since they provide a large projection area. We have colorimetrically characterized a LCoS projector using a mathematical model requiring additivity and constancy of the primaries -a sigmoid function in our case. Significant differences in chromaticity in the CIELAB space, but not in lightness, were found between the center and the corners of the screen. The lack of spatial homogeneity led us to estimate the parameters of the model as a function of spatial position, using different strategies. The best result was obtained by interpolating the values of the parameters of the model determined from experimental measurem…
Learning vector quantization with alternative distance criteria
2003
An adaptive algorithm for training of a nearest neighbour (NN) classifier is developed in this paper. This learning rule has some similarity to the well-known LVQ method, but uses the nearest centroid neighbourhood concept to estimate optimal locations of the codebook vectors. The aim of this approach is to improve the performance of the standard LVQ algorithms when using a very small codebook. The behaviour of the learning technique proposed here is experimentally compared to those of the plain k-NN decision rule and the LVQ algorithms.
Steiner systems and configurations of points
2020
AbstractThe aim of this paper is to make a connection between design theory and algebraic geometry/commutative algebra. In particular, given any Steiner SystemS(t, n, v) we associate two ideals, in a suitable polynomial ring, defining a Steiner configuration of points and its Complement. We focus on the latter, studying its homological invariants, such as Hilbert Function and Betti numbers. We also study symbolic and regular powers associated to the ideal defining a Complement of a Steiner configuration of points, finding its Waldschmidt constant, regularity, bounds on its resurgence and asymptotic resurgence. We also compute the parameters of linear codes associated to any Steiner configur…
Eye tracking and the translation process: reflections on the analysis and interpretation of eye-tracking data
2014
Eye tracking has become increasingly popular as a quantitative research method in translation research. This paper discusses some of the major methodological issues involved in the use of eye tracking in translation research. It focuses specifically on challenges in the analysis and interpretation of eye-tracking data as reflections of cognitive processes during translation. Four types of methodological issues are discussed in the paper. The first part discusses the preparatory steps that precede the actual recording of eye-tracking data. The second part examines critically the general assumptions linking eye movements to cognitive processing in the context of translation research. The thir…
Cómo los corpus pueden asistir a los estudiantes de traducción jurídica : la plataforma GENTT TransTools Corpora y Sketch Engine
2019

 Esta aportación analiza la aplicación de corpus a la enseñanza de la traducción jurídica en la educación superior utilizando la plataforma GENTT TransTools Corpora y Sketch Engine. En primer lugar, revisaremos la bibliografía sobre experiencias previas de aplicación de corpus textuales a la enseñanza de la traducción jurídica. A continuación, describiremos la experiencia de 10 años del grupo GENTT en el aula de traducción especializada, en la que hemos aplicado una metodología basada corpus y dirigida a promover la formación guiada y el aprendizaje constructivo y cooperativo. Estas experiencias sugieren que los corpus monolingües, multilingües y traducidos de textos especializados c…
Critical Digital Editions of Theatrical Texts: The Example of La estrella de Sevilla
2014
This article analyses the process of creating a multilingual and multimedia critical digital edition of the text from the Spanish Golden Age La Estrella de Sevilla. It begins with a reflection on what a critical digital edition is, and then it presents different projects about digital editions of theatrical texts as well as some practical issues on the encoding of the texts included in this digital critical edition.
Inclusive ethnographies
2017
Abstract In ethnographically oriented linguistic landscape studies, social spaces are studied in co-operation with research participants, many times through mobile encounters such as walking. Talking, walking, photographing and video recording as well as writing the fieldwork diary are activities that result in the accumulation of heterogeneous, multimodal corpora. We analyze data from a Hungarian school ethnography project to reconstruct fieldwork encounters and analyze embodiment, the handling of devices (e.g. the photo camera) and verbal interaction in exploratory, participant-led walking tours. Our analysis shows that situated practices of embodied conduct and verbal interaction blur th…