Interactive 3D Visualization of a Large University Campus over the Web

Nowadays, with the rise and generalized use of web applications and graphical hardware evolution, one of the most interesting problems deals with realistic real-time visualization of virtual environments on web browsers. This paper shows an on-line application to dynamically visualize a large campus on the World Wide Web. The application focuses on a smooth walk through a large 3D environment in real-time as an alternative way to index geographically related information. This way, contents are continuously filtered based on viewpoint¿s position. This can be made thanks to the availability of different models corresponding to different levels of detail (LOD) for each modeled building. A server storage model has been purposed including all models, compound of meshes, textures and information. The technique is based on an algorithm that performs a progressive refining of the models, according to the distance from the viewpoint.Vendrell Vidal, E.; Sanchez Belenguer, C. (2011). Interactive 3D Visualization of a Large University Campus over the Web. International Journal of Computer Information Systems and Industrial Management Applications. 3:514-521. http://hdl.handle.net/10251/35020S514521

Modelado y Reconstrucción de Fragmentos Arqueológicos a partir de Correspondencia de Patrones

Desarrollo de un software de ayuda en la reconstrucción de mosaicos a partir de restos arqueológicos. Obtención de modelos 2D y 3D de las diferentes piezas, almacenados en una BBDD en formatos CAD estándar, junto a las características más relevantes para la reconstrucción. Desarrollo de un algoritmo de búsqueda de correspondencias eficiente.Sánchez Belenguer, C. (2010). Modelado y Reconstrucción de Fragmentos Arqueológicos a partir de Correspondencia de Patrones. http://hdl.handle.net/10251/14207Archivo delegad

Reconstrucción de fragmentos arqueológicos mediante correspondencia de patrones

[EN] This paper introduces a method for automatic archaeological fragment reconstruction, based on the pattern matching techniques originally developed in graphic computing and image analysis fields. The method is embodied in a software tool that provides the bests matches in a set of bi-dimensional archaeological fragments. To ensure the efficiency of the results, it has been developed a theoretical study that allows solving the stated problem, ensuring the correction of results, and with a very competitive execution times.[ES] En este artículo se presenta un método automático para la reconstrucción de fragmentos arqueológicos, basado en técnicas de correspondencia de patrones desarrolladas en el ámbito de la informática gráfica y el análisis de imágenes. El método se plasma en el desarrollo de una herramienta informática que permita obtener las mejores correspondencias entre un conjunto de fragmentos caracterizados bidimensionalmente. Para garantizar la eficiencia del resultado, se ha desarrollado un estudio teórico que permite dar solución al problema considerado garantizando la corrección de los resultados, y con tiempos de ejecución muy competitivosVendrell Vidal, E.; Sanchez Belenguer, C. (2012). Reconstrucción de fragmentos arqueológicos mediante correspondencia de patrones. Virtual Archaeology Review. 3(6):68-72. doi:10.4995/var.2012.4446S687236AIGER D., MITRA N. J., COHEN-OR D. (2008): "4-points congruent sets for robust surface registration", en ACM Transactions On Graphics (Proc. SIGGRAPH), pp. 1-10. http://dx.doi.org/10.1145/1360612.1360684BROWN B. J. et al. (2008): "A System for High-Volume Acquisition and Matching of Fresco Fragments: Reassembling Theran Wall Paintings", en ACM Transactions on Graphics (Proc. SIGGRAPH), vol 27, no 3. http://dx.doi.org/10.1145/1399504.1360683FISCHLER M. A., BOLLES R. C. (1981): "Random sample consensus: a paradigm for model fitting with applications to image analysis and automated cartography", en Commun ACM, pp. 381-395.HUTTENLOCHER D. P., ULLMAN S. (1990): "Recognizing solid objects by alignment with an image", en International Journal of Computer Vision, pp. 195-212.KOLLER D. et al. (2005): "Fragments of the City: Stanfordʹs Digital Forma Urbis Romae Project", en Journal of Roman Archaeology (Proc. of the Third Williams Symposium on Classical Architecture).NIHSHANKA D. (2007): "Project Report - A Survey of Recent Advances in Shape Matching". Duke University, Durham, USA.PAULY M., et al. (2005): "Example-based 3D scan completion", en Proceedings Symposiumon Geometric Processing (SGP).RUSINKIEWICZ S., LEVOY M. (2001): "Efficient variants of the ICP algorithm", en Proceedings 3rd International Conference on 3D Digital Imaging and Modeling, pp. 145-152. http://dx.doi.org/10.1109/im.2001.924423VAN KAICK O. et al. (2010): "A Survey on Shape Correspondence", en Eurographics STAR Report (2010

GEMA2:Geometrical matching analytical algorithm for fast mobile robots global self-localization

[EN] This paper presents a new algorithm for fast mobile robot self-localization in structured indoor environments based on geometrical and analytical matching, GEMA(2). The proposed method takes advantage of the available structural information to perform a geometrical matching with the environment information provided by measurements collected by a laser range finder. In contrast to other global self-localization algorithms like Monte Carlo or SLAM, GEMA(2) provides a linear cost with respect the number of measures collected, making it suitable for resource-constrained embedded systems. The proposed approach has been implemented and tested in a mobile robot with limited computational resources showing a fast converge from global self-localization. (C) 2014 Elsevier B.V. All rights reserved.This work has been partially funded by FEDER-CICYT projects with references DPI2011-28507-C02-01 and HAR2012-38391-C02-02 financed by Ministerio de Ciencia e Innovacion and Ministerio de Economia y Competitividad (Spain).Sánchez Belenguer, C.; Soriano Vigueras, Á.; Vallés Miquel, M.; Vendrell Vidal, E.; Valera Fernández, Á. (2014). GEMA2:Geometrical matching analytical algorithm for fast mobile robots global self-localization. Robotics and Autonomous Systems. 62(6):855-863. https://doi.org/10.1016/j.robot.2014.01.009S85586362

Modelado automatizado de embalajes para vidrio arqueológico y su fabricación mediante fresado de espumas rígidas

En este trabajo se aborda la problemática existente en el transporte y almacenamiento de piezas de vidrio arqueológico. El principal objetivo es realizar embalajes adaptados mediante la utilización de técnicas de escaneado 3D e impresión 3D. Habitualmente los embalajes de estas piezas suelen realizarse de manera artesanal confeccionando cajas o soportes a medida que se adaptan a las necesidades y particularidades de cada caso por lo que implican un gran consumo de tiempo. Ateniendo a las circunstancias físicas del vidrio arqueológico que deriban en una mínima manipulación, se ha buscado automatizar el proceso. Para ello se han registrado las piezas seleccionadas, utilizando un escáner láser de triangulación v-910 Kónica Minolta, obteniendo los modelos 3D de cada pieza, y a partir de ellos generar el negativo de la forma de la pieza. Posteriormente son enviados a una máquina de corte o de fresado para obtener el modelo real. Para ello se ha requerido de un software con el que diseñar la cavidad adaptada y generar un código de control para la fresadora CNC. Siguiendo este proceso se ha conseguido la adaptación perfecta del volumen del embalaje, dando la posibilidad de rectificar el diseño y consiguiendo mayor calidad y precisión en la ejecución al mecanizarse las diferentes fases. La realización de los embalajes artesanales está caracterizada por su gran consumo de tiempo y su alto porcentaje de error, al contrario que este nuevo proceso que reduce significativamente el tiempo de realización y ofrece una solución adapatada a cada objeto.Díaz Marín, MDC.; Aura Castro, E.; Sánchez Belenguer, C.; Vendrell Vidal, E.; Sánchez López, M. (2015). Modelado automatizado de embalajes para vidrio arqueológico y su fabricación mediante fresado de espumas rígidas. Arché. (10):119-126. http://hdl.handle.net/10251/852051191261

Cyclododecane as opcifier for digitalization of archaeological glass

[EN] This paper faces the problem of acquiring archaeological artifacts using triangulation based 3D laser scanners and focusing on reflective/refractive surfaces. This kind of artifacts are mostly made of glass or polished metal, and the properties of their surfaces violate most of the fundamental assumptions made by vision algorithms. Also, the unique and fragile nature of archaeological artifacts adds an extra constraint to the acquisition process: the use of industrial whitening sprays has to be avoided, due to the physicochemical processes required to clean the surface after scanning and because the chemical properties of these sprays may damage the original object. As an alternative to them, a new way to use a common conservation material is proposed: the use of cyclododecane as a whitening spray. Thanks to its chemical stability and to the fact that it sublimes at room temperature, together with its good filmforming capabilities, a set of evaluation tests is presented to prove thatthe error introduced by the opaque thin layer created on the surface of the artifact is smaller than the accuracy of the 3D scanner and, thus, no acquisition errors are introduced. A comparison with general-purpose industrial whitening sprays is also presented, and achieved results show no significant differences in the quality of the resulting 3D models.This work is supported by the "Programa de Ayudas de Investigacion y Desarrollo (PAID)" of the Universitat Politecnica de Valencia and the "Plan Nacional de I+D+i 2008-2011" from the Ministerio de Economia y Competitividad of Spain, Projects ID: HAR2012-38391-C02-01 and HAR2012-38391-C02-02.Díaz Marín, MDC.; Aura Castro, E.; Sánchez Belenguer, C.; Vendrell Vidal, E. (2016). Cyclododecane as opcifier for digitalization of archaeological glass. Journal of Cultural Heritage. 17:131-140. https://doi.org/10.1016/j.culher.2015.06.003S1311401

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Search for supersymmetry in events with large missing transverse momentum, jets, and at least one tau lepton in 20 fb−1 of √s=8 TeV proton-proton collision data with the ATLAS detector

A search for supersymmetry (SUSY) in events with large missing transverse momentum, jets, at least one hadronically decaying tau lepton and zero or one additional light leptons (electron/muon), has been performed using 20.3fb−1 of proton-proton collision data at √s= 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed in the various signal regions and 95% confidence level upper limits on the visible cross section for new phenomena are set. The results of the analysis are interpreted in several SUSY scenarios, significantly extending previous limits obtained in the same final states. In the framework of minimal gauge-mediated SUSY breaking models, values of the SUSY breaking scale Λ below 63 TeV are excluded, independently of tan β. Exclusion limits are also derived for an mSUGRA/CMSSM model, in both the R-parity-conserving and R-parity-violating case. A further interpretation is presented in a framework of natural gauge mediation, in which the gluino is assumed to be the only light coloured sparticle and gluino masses below 1090 GeV are excluded

Search for direct top-squark pair production in final states with two leptons in pp collisions at √s = 8TeV with the ATLAS detector

A search is presented for direct top-squark pair production in final states with two leptons (electrons or muons) of opposite charge using 20.3 fb−1 of pp collision data at √s = 8 TeV, collected by the ATLAS experiment at the Large Hadron Collider in 2012. No excess over the Standard Model expectation is found. The results are interpreted under the separate assumptions (i) that the top squark decays to a b-quark in addition to an on-shell chargino whose decay occurs via a real or virtual W boson, or (ii) that the top squark decays to a t-quark and the lightest neutralino. A top squark with a mass between 150 GeV and 445 GeV decaying to a b-quark and an on-shell chargino is excluded at 95% confidence level for a top squark mass equal to the chargino mass plus 10 GeV, in the case of a 1 GeV lightest neutralino. Top squarks with masses between 215 (90) GeV and 530 (170) GeV decaying to an on-shell (off-shell) t-quark and a neutralino are excluded at 95% confidence level for a 1 GeV neutralino

Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in s √ = 8 TeV pp collisions with the ATLAS detector

A search is presented for direct top squark pair production using events with at least two leptons including a same-flavour opposite-sign pair with invariant mass consistent with the Z boson mass, jets tagged as originating from b-quarks and missing transverse momentum. The analysis is performed with proton–proton collision data at s√=8 TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20.3 fb−¹. No excess beyond the Standard Model expectation is observed. Interpretations of the results are provided in models based on the direct pair production of the heavier top squark state (t~2) followed by the decay to the lighter top squark state (t~1) via t~2→Zt~1, and for t~1 pair production in natural gauge-mediated supersymmetry breaking scenarios where the neutralino (χ~10) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G~) via the χ~10→ZG~ process