Pilar Merchán

Pilar Merchán
Universidad de Extremadura | UNEX · Department of Electric Engineering, Electronics and Automatics

PhD

About

89
Publications
17,092
Reads
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380
Citations
Citations since 2016
37 Research Items
191 Citations
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
Additional affiliations
February 2000 - present
Universidad de Extremadura
Position
  • PhD
Education
September 2008 - June 2011
Universidad de Extremadura
Field of study
  • TRAINING AND UNIVERSITY TEACHING IN THE EHEA
October 2000 - July 2007
Universidad de Extremadura
Field of study
  • COMPUTER VISION
October 1991 - June 1996

Publications

Publications (89)
Article
Full-text available
Accessibility regulations towards building design and public places are more restrictive than in past years. Along with energy efficiency, accessibility is one of the pillars of an optimal building design. However, even buildings adapted for actual regulations are not always optimal, and there is still much to do to avoid adding more difficulties f...
Chapter
Full-text available
Las nubes de puntos cada vez pueden contener más información, parte de la cual puede ser variable en el tiempo. Por este motivo, es valioso poder generar nubes que contengan la información correspondiente a diferentes instantes de tiempo sin la edundancia de información espacial. De esta forma, se consigue que el procesamiento y la visualización de...
Chapter
Full-text available
Desde sus inicios, el ámbito de la visión por computador se ha esforzado por recabar de imágenes 2D y espacios 3D la información y el conocimiento que el ser humano puede extraer fácilmente con un solo vistazo. Los métodos más efectivos han apostado por llevar el concepto de inteligencia artificial un paso más allá, optando por unir la extracción d...
Chapter
Es práctica habitual que desde los diversos sectores que afectan al conocimiento y gestión de los edificios patrimoniales se trabaje individualmente, sin una visión de conjunto. De este modo, la colaboración se establece dentro de un mismo nivel, sin la necesaria integración de otros puntos de vista en la búsqueda de soluciones. Esta falta de inter...
Article
Full-text available
When it concerns dissemination, the relationship between cultural heritage and technology has not always been easy. On the one hand, the emotions involved in knowing, enjoying, and feeling a real heritage remain should not be eclipsed by the technological experience. On the other hand, technology cannot be relegated to the point where its use is so...
Article
Full-text available
This paper presents a method to restore 3D models created from range sensors. The approach recovers the 3D information that is lost during the scanning process, usually due to inaccessible zones on the object (occluded areas and crevices). The raw and incomplete 3D data are first projected onto a grid to identify the zones to be repaired. Our algor...
Chapter
La recuperación de la policromía en la estatuaria antigua es un proceso complejo. Además de la enorme pérdida de pigmentos provocada por la lixiviación y el paso del tiempo, la errónea concepción de un mundo clásico en mármol blanco forjada en el Renacimiento provocó que los ornamentos pétreos de las ciudades sufrieran un proceso de limpieza tal qu...
Chapter
Full-text available
No se concibe el trabajo arqueológico en la actualidad sin la inclusión de nuevas metodologías que faciliten las tareas de investigación y ofrezcan soluciones a problemas que, empleando métodos tradicionales, quedarían sin resolver. Proponemos en este artículo la aplicación de una estrategia de reconstrucción de puzles 3D incompletos sobre una de l...
Article
Full-text available
People with disabilities encounter numerous barriers when dealing with the simplest and most usual things in their daily lives. This is even more remarkable when they are faced with archaeological heritage buildings or environments. People with reduced mobility come too often upon architectural barriers that stop them from enjoying their visits to...
Article
The traditional approach for physical reproduction in Cultural Heritage requires the production of moulds on the very surface of the original artwork in an invasive, manual and usually time-consuming process that is intensely influenced by the complexity of the piece to be reproduced. The difficulties increase when changing the size of the copy is...
Article
Virtual laboratories have been demonstrated to contribute successfully to the theoretical understanding of many important systems theory and automatic control concepts in engineering education. This paper describes the pilot experience on the use of such laboratories as learning tools in introductory systems theory courses at the University of Extr...
Conference Paper
There is ample evidence that supports that interactive learning enhances learning and knowledge retention among students. This paper provides a set of considerations on the use of interactive tools, mainly from the perspective of the teachers (usually, also lab designers), regarding the benefits and weaknesses of these resources in control engineer...
Article
Full-text available
Technology development really reaches its highest point when it becomes a tool to facilitate life to people, especially to those more disadvantaged groups. This is the case of people with disabilities, who find lots of barriers to cope with the most usual and simplest things in their day-to-day. This fact is even more significant when they happen t...
Conference Paper
t is a fact that studying subjects eminently theoretical as History, Philosophy, etc. may sometimes be boring for teenagers. In our current society, based on the immediacy of data, images, sounds..., telling stories in a traditional way ends up reversing in a counterproductive way for learners and teachers. New educational methodologies have been d...
Article
This paper presents an original method for the analysis of the geometric and optical properties of parabolic solar trough collectors using laser scanners and image processing techniques. The aim of the paper is to propose a methodology with which to automatically analyse geometric errors in the mirror and receiver, in addition to presenting an empi...
Conference Paper
Children, from ever younger ages, are exposed to new technologies and accustomed to their usage. One of the uses they enjoy the nost are video games. During game sessions, they are focused on the objectives of the game and have an enthusiastic and active attitude. Conversely, children have a passive attitude, as mere receivers of knowledge, and som...
Chapter
The current advances of Information and Communication Technologies (ICTs) have created new spaces for the recreational participation, mainly on virtual spaces, which can be considered as one of the main drivers of the cultural and creative production. This paper describes the experience in developing and testing an interactive 3D virtual environmen...
Conference Paper
Full-text available
El Modelado con Información para la Construcción (Building Information Modelling o BIM, en inglés) es una metodología de trabajo colaborativa que implica el proceso de generación y gestión de datos de un edificio a lo largo de su ciclo de vida. En los últimos años, estos modelos se han adaptado con éxito a la gestión de información en el ámbito de...
Conference Paper
Full-text available
En este trabajo se presenta un procedimiento de segmentación de datos 3D pertenecientes a obras del patrimonio cultural. El objetivo es, en primer lugar, que el algoritmo sea capaz de separar las zonas ornamentales de las no ornamentales y, en segundo lugar, que el procedimiento sea rápido. Para ello se ha propuesto un método que realiza la segment...
Conference Paper
Full-text available
Este trabajo trata de la adaptación experimentada por la metodología BIM (Building Information Modelling) para abordar el modelado y la gestión de edificios históricos, obteniendo lo que se conoce como HBIM (Heritage/Historic Building Information Model). Las siete dimensiones y los niveles de madurez establecidos en BIM, se evalúan y analizan para...
Article
In the last decades, the academic community has developed a huge variety of interactive resources to support teaching both in the classroom and in the laboratory, especially in engineering degrees. Among them, the use of virtual and remote laboratories (VRLs), which combine features of traditional laboratories with interactive simulations, is essen...
Chapter
This chapter presents a new line of research that addresses the treatment of data acquired through different sensors to capture reality in order to obtain useful information that can be applied to the generation of knowledge in the field of conservation and restoration of Cultural Heritage. This technology is expected to be used to solve impact pro...
Chapter
This chapter deals with the adaptation experienced by BIM (Building Information Modelling) methodology to address the modelling and management of heritage/historic buildings, obtaining what is known as HBIM (Heritage/Historic Building Information Modelling).
Conference Paper
Both the acquisition of practical skills and experimentation plays a vital role in technology and engineering education. To that purpose, and due to several reasons, one effective and reasonable way to support teaching in the classroom and the laboratory is to use interactive tools. This article summarizes the teaching experience derived by using t...
Conference Paper
In the current context of new information and communications technologies (ICTs), many universities are revamping their learning and teaching methods with more refined and effective teaching practices in which students are actively included in the teaching-learning process. This paper discusses on current trends in engineering education to ensure t...
Article
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This paper presents a review of the most relevant current techniques that deal with hole-filling in 3D models. Contrary to earlier reports, which approach mesh repairing in a sparse and global manner, the objective of this review is twofold. First, a specific and comprehensive review of hole-filling techniques (as a relevant part in the field of me...
Article
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Recientemente, profesores e investigadores han desarrollado gran cantidad de recursos basados en las nuevas tecnologías para el apoyo a la enseñanza, sobre todo para la docencia en ingenierías. El presente artículo describe el desarrollo de simuladores basados en herramientas de modelado físico, concretamente mediante las denominadas SimMechanics y...
Conference Paper
New technologies bring innovative aspects to the field of education that involve a qualitative improvement in the forms of teaching and learning. Its use not only allows the effective implementation of some of the existing educational theories but also opens the possibilities for exploration of new models, with a multidisciplinary perspective. A la...
Conference Paper
Full-text available
In this paper, we try to summarize and give an overview of the archaeometric methods proposed hitherto, both chemical analysis and physical tests, which have been used for the recovery of the colour. This way, by considering them diachronically, we will be able to assess the results obtained by those that have more prestige these days. From the vis...
Article
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Humans decide how to carry out a spontaneous interactionwith an object by using the whole geometric information obtained from their eyes. The aim of this paper is to present how our object representation model MWS (Adán in Comput Vis Image Underst 79:281–307, 2000) can help a robot manipulator to make a single and reliable interaction. The contribu...
Article
Full-text available
En este artículo se propone un método para rellenar huecos en objetos 3D. La idea principal es la de utilizar un algoritmo de restauración de imágenes para reconstruir las partes que se han de completar. Para ello es necesario hacer una transformación de los datos de la superficie 3D en datos de imagen 2D. Por tanto, el algoritmo propuesto parte de...
Conference Paper
The aim of this article is to highlight the importance that the access to a database elaborated from this technology supposes for students of this matter who can know the scales, textures, volumes, etc. of an archaeological piece as if they had it between their own hands. In this case, we have produced a digital database made up of the funds of the...
Conference Paper
In this paper we show the work that must be carried out to generate accurate, dense and coloured 3D models of large outdoor ancient scenarios from scanners. This is a challenging research field in which several problems still remain unsolved. Particularly, the 3D model creation process in outdoor scenes might be inefficient if the scene is digitali...
Article
Full-text available
This paper deals with the generation of accurate, dense and coloured 3D models of outdoor scenarios from scanners. This is a challenging research field in which several problems still remain unsolved. In particular, the process of 3D model creation in outdoor scenes may be inefficient if the scene is digitalized under unsuitable technical (specific...
Conference Paper
This paper has a double aim: on the one hand it deals with the description of the work that must be carried out to incorporate 3D models to the teaching-learning process. It covers the whole course of action from the planning acquisition phase to the post-processing stage that finishes with the digital replica of the real object provided. On the ot...
Article
The automatic reconstruction of archeological pieces through the integration of a set of unknown segments is a highly complex problem which is still being researched. When only a few segments of the original piece are available, solutions exclusively based on computational algorithms are inefficient when attempting to create a credible whole restor...
Conference Paper
Full-text available
To date the methods to create accuracy dense realistic 3D models of outdoors by using laser scanners are highly dependent on the on-site conditions in the very moment of the 3D data collection. Thus, researchers put in a lot of effort on eliminating colour incoherencies (sunny/shady, bright/dark, non sensed areas, etc.) or modelling the light of th...
Article
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Imagine for a moment that you have to solve a 3D jigsaw of which you have lost several pieces. You have also lost the original box-top showing the final picture, and as if that were not enough, some of the pieces you do have may belong to some other jigsaw. This is in essence the sort of challenge that we faced in the novel project that we shall be...
Article
The intention of the strategy proposed in this paper is to solve the object retrieval problem in highly complex scenes using 3D information. In the worst case scenario the complexity of the scene includes several objects with irregular or free-form shapes, viewed from any direction, which are self-occluded or partially occluded by other objects wit...
Article
Full-text available
Lo más habitual es que los restos arqueológicos estatuarios se encuentran fragmentados. Debido a ello, en cada fragmento habrá zonas que formen parte de la porción esculpida y otras que sean regiones por donde se haya roto la escultura. Una labor inicial básica para la restitución de éstas, es la determinación de qué partes son de rotura y qué part...
Conference Paper
The aim of this paper is to propose a new monocular-vision strategy for real-time positioning under augmented reality conditions. This is an important aspect to be solved in augmented reality (AR) based navigation in non-controlled environments. In this case, the position and orientation of the moving observer, who usually wears a head mounted disp...
Conference Paper
Full-text available
Object recognition may be a hard computer vision task under severe occlusion circumstances. This problem is efficiently solved in this paper through a new 3D recognition method for free-form objects. The technique uses the Depth Gradient Image Based on Silhouette representation (DGI-BS) and settles the problem of identification-pose under occlusion...
Conference Paper
In this paper we present the 3D restitution of large and incomplete thousand-year-old sculptures belonging to the Spanish Museum of Roman Art (MNAR, Museo Nacional de Arte Romano). Roman sculptures are difficult to synthesize because of the complex geometry of the clothes that the characters usually wear and the glows that the marble causes. Theref...
Conference Paper
Full-text available
This work faces the problem of 3D shape clustering when the whole surface information is available. The key of our method is to use a flexible feature, called Cone-Curvature, which provides local and extended information around every node of the mesh that represents the object. Thus as we increase the region around a node a new order of CC can be c...
Conference Paper
Full-text available
In this work a method for filling holes in 3D meshes based on a 2D image restoration algorithm is expounded. Since 3D data must be converted to a suitable input format, a 3D to 2D transformation is executed by projecting the 3D surface onto a grid. The storage of the depth information in every grid provides the 2D image which the restoration algori...
Article
Full-text available
This paper presents a new strategy to extract knowledge about the objects and their relative location in a complex scene when a single range image is taken. The analysis process is based on a range data distributed segmentation technique, which separates the components of the scene, and on a silhouette segmentation method, which classified the silh...
Conference Paper
Nowadays virtual reality users and professionals demand a growing quality and a higher degree of realism in development and applications. Among these technologies augmented reality systems stand out due to their complexity and possibilities, having open current problems from the digitalization process to the accurate insertion of digital informatio...
Article
Full-text available
This work describes a method for filling holes in a 3D mesh based on 2D image restoration algorithms. Since these algorithms need an image as input, the first stage of the method concerns a 3D to 2D transformation. By pro- jecting the 3D surface onto a squared plane, a 2D image is generated in such a way that the depth information is stored in each...
Conference Paper
Full-text available
This paper analyzes a new 3D recognition method for occluded objects in complex scenes. The technique uses the Depth Gradient Image Based on Silhouette representation (DGI-BS) and settles the problem of identification-pose under occlusion and noise requirements. DGI-BS synthesizes both surface and contour information avoiding restrictions concernin...
Article
A new strategy for automatic object extraction in highly complex scenes is presented in this paper. The method proposed gives a solution for 3D segmentation avoiding most restrictions imposed in other techniques. Thus, our technique is applicable on unstructured 3D information (i.e. cloud of points), with a single view of the scene, scenes consisti...
Article
Full-text available
En este trabajo se muestra un método para el reconocimiento de objetos de forma libre a partir de los datos de rango de una vista parcial. Para ello presentamos una nueva característica que denominamos Cono-Curvatura Ponderada (WCC), que mide el ángulo que sustenta cada uno de los nodos de la malla. Debido a que la información empleada no es comple...
Article
In this work we present a method for free-form object recognition from range data of one partial view. To do this, a new feature, called Weighted Cone-Curvature (CCW), is introduced. The CCW measures the angle supported for the nodes of the mesh. Because of the fact that the information is not complete, it is necessary to apply a technique based on...
Conference Paper
Object recognition in 3D scenes with occlusion means identifying an incomplete and unknown object, which is arbitrarily posed, in an object database. This hard computer vision problem is solved in this paper through a new 3D shape representation called depth gradient image based on silhouette (DGI-BS). DGI-BS can be used to obtain a complete model...
Conference Paper
Full-text available
Greatest difficulties arise in 3D environments when we have to deal with a scene with dissimilar objects without pose restrictions and where contacts and occlusions are allowed. This work tackles the problem of correspondence and alignment of surfaces in such a kind of scenes. The method presented in this chapter is based on a new representation mo...
Article
Full-text available
En este trabajo se presenta un toolbox para el programa Matlab que permite la adquisición de datos 3D mediante técnicas de visión activa. Se trata de un sistema constituido por elementos de bajo coste: una cámara (en nuestro caso se ha empleado una webcam conectada al puerto USB del PC), una lámpara, dos planos de referencia y una barra o stick. Ot...
Conference Paper
Full-text available
This paper shows how to extract information about the parts and their layout in a complex scene when a single range image is available. In the worst case, the complexity of the scene includes: no shape-restrictions, shades, occlusion, cluttering, contact, surfaces viewed in oblique angles and without textures. This work is a prerequisite before car...