2,550 research outputs found

    Analyzing interference between RGB-D cameras for human motion tracking

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    Multi-camera RGB-D systems are becoming popular as sensor setups in Computer Vision applications but they are prone to cause interference between them, compromising their accuracy. This paper extends previous works on the analysis of the noise introduced by interference with new and more realistic camera configurations and different brands of devices. As expected, the detected noise increases as distance and angle grows, becoming worse when interference is present. Finally, we evaluate the effectiveness of the proposed solutions of using DC vibration motors to mitigate them. The results of this study are being used to assess the effect of interference when applying these setups to human motion tracking.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Plan Propio de Investigación de la UMA. Junta de Andalucía, proyecto TEP2012-53

    Augmented and virtual reality evolution and future tendency

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    Augmented reality and virtual reality technologies are increasing in popularity. Augmented reality has thrived to date mainly on mobile applications, with games like Pokémon Go or the new Google Maps utility as some of its ambassadors. On the other hand, virtual reality has been popularized mainly thanks to the videogame industry and cheaper devices. However, what was initially a failure in the industrial field is resurfacing in recent years thanks to the technological improvements in devices and processing hardware. In this work, an in-depth study of the different fields in which augmented and virtual reality have been used has been carried out. This study focuses on conducting a thorough scoping review focused on these new technologies, where the evolution of each of them during the last years in the most important categories and in the countries most involved in these technologies will be analyzed. Finally, we will analyze the future trend of these technologies and the areas in which it is necessary to investigate to further integrate these technologies into society.Universidad de Sevilla, Spain Telefonica Chair “Intelligence in Networks

    A comparative study using an autostereoscopic display with augmented and virtual reality

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    Advances in display devices are facilitating the integration of stereoscopic visualization in our daily lives. However, autostereoscopic visualization has not been extensively exploited. In this paper, we present a system that combines Augmented Reality (AR) and autostereoscopic visualization. We also present the first study that compares different aspects using an autostereoscopic display with AR and VR, in which 39 children from 8 to 10 years old participated. In our study, no statistically significant differences were found between AR and VR. However, the scores were very high in nearly all of the questions, and the children also scored the AR version higher in all cases. Moreover, the children explicitly preferred the AR version (81%). For the AR version, a strong and significant correlation was found between the use of the autostereoscopic screen in games and seeing the virtual object on the marker. For the VR version, two strong and significant correlations were found. The first correlation was between the ease of play and the use of the rotatory controller. The second correlation was between depth perception and the game global score. Therefore, the combinations of AR and VR with autostereoscopic visualization are possibilities for developing edutainment systems for childrenThis work was funded by the Spanish APRENDRA project (TIN2009-14319-C02). We would like to thank the following for their contributions: AIJU, the "Escola d'Estiu" and especially Ignacio Segui, Juan Cano, Miguelon Gimenez, and Javier Irimia. This work would not have been possible without their collaboration. The ALF3D project (TIN2009-14103-03) for the autostereoscopic display. Roberto Vivo, Rafa Gaitan, Severino Gonzalez, and M. Jose Vicent, for their help. The children's parents who signed the agreement to allow their children to participate in the study. The children who participated in the study. The ETSInf for letting us use its facilities during the testing phase.Arino, J.; Juan Lizandra, MC.; Gil Gómez, JA.; Mollá Vayá, RP. (2014). A comparative study using an autostereoscopic display with augmented and virtual reality. Behaviour and Information Technology. 33(6):646-655. https://doi.org/10.1080/0144929X.2013.815277S646655336Azuma, R. T. (1997). A Survey of Augmented Reality. Presence: Teleoperators and Virtual Environments, 6(4), 355-385. doi:10.1162/pres.1997.6.4.355Blum, T.et al. 2012. Mirracle: augmented reality in-situ visualization of human anatomy using a magic mirror.In: IEEE virtual reality workshops, 4–8 March 2012, Costa Mesa, CA, USA. Washington, DC: IEEE Computer Society, 169–170.Botden, S. M. B. I., Buzink, S. N., Schijven, M. P., & Jakimowicz, J. J. (2007). Augmented versus Virtual Reality Laparoscopic Simulation: What Is the Difference? World Journal of Surgery, 31(4), 764-772. doi:10.1007/s00268-006-0724-yChittaro, L., & Ranon, R. (2007). Web3D technologies in learning, education and training: Motivations, issues, opportunities. Computers & Education, 49(1), 3-18. doi:10.1016/j.compedu.2005.06.002Dodgson, N. A. (2005). Autostereoscopic 3D displays. Computer, 38(8), 31-36. doi:10.1109/mc.2005.252Ehara, J., & Saito, H. (2006). Texture overlay for virtual clothing based on PCA of silhouettes. 2006 IEEE/ACM International Symposium on Mixed and Augmented Reality. doi:10.1109/ismar.2006.297805Eisert, P., Fechteler, P., & Rurainsky, J. (2008). 3-D Tracking of shoes for Virtual Mirror applications. 2008 IEEE Conference on Computer Vision and Pattern Recognition. doi:10.1109/cvpr.2008.4587566Fiala, M. (2007). Magic Mirror System with Hand-held and Wearable Augmentations. 2007 IEEE Virtual Reality Conference. doi:10.1109/vr.2007.352493Froner, B., Holliman, N. S., & Liversedge, S. P. (2008). A comparative study of fine depth perception on two-view 3D displays. Displays, 29(5), 440-450. doi:10.1016/j.displa.2008.03.001Holliman, N. S., Dodgson, N. A., Favalora, G. E., & Pockett, L. (2011). Three-Dimensional Displays: A Review and Applications Analysis. IEEE Transactions on Broadcasting, 57(2), 362-371. doi:10.1109/tbc.2011.2130930Ilgner, J. F. R., Kawai, T., Shibata, T., Yamazoe, T., & Westhofen, M. (2006). Evaluation of stereoscopic medical video content on an autostereoscopic display for undergraduate medical education. Stereoscopic Displays and Virtual Reality Systems XIII. doi:10.1117/12.647591Jeong, J.-S., Park, C., Kim, M., Oh, W.-K., & Yoo, K.-H. (2011). Development of a 3D Virtual Laboratory with Motion Sensor for Physics Education. Ubiquitous Computing and Multimedia Applications, 253-262. doi:10.1007/978-3-642-20975-8_28Jones, J. A., Swan, J. E., Singh, G., Kolstad, E., & Ellis, S. R. (2008). The effects of virtual reality, augmented reality, and motion parallax on egocentric depth perception. Proceedings of the 5th symposium on Applied perception in graphics and visualization - APGV ’08. doi:10.1145/1394281.1394283Juan, M. C., & Pérez, D. (2010). Using augmented and virtual reality for the development of acrophobic scenarios. Comparison of the levels of presence and anxiety. Computers & Graphics, 34(6), 756-766. doi:10.1016/j.cag.2010.08.001Kaufmann, H., & Csisinko, M. (2011). Wireless Displays in Educational Augmented Reality Applications. Handbook of Augmented Reality, 157-175. doi:10.1007/978-1-4614-0064-6_6Kaufmann, H., & Meyer, B. (2008). Simulating educational physical experiments in augmented reality. ACM SIGGRAPH ASIA 2008 educators programme on - SIGGRAPH Asia ’08. doi:10.1145/1507713.1507717Konrad, J. (2011). 3D Displays. Optical and Digital Image Processing, 369-395. doi:10.1002/9783527635245.ch17Konrad, J., & Halle, M. (2007). 3-D Displays and Signal Processing. IEEE Signal Processing Magazine, 24(6), 97-111. doi:10.1109/msp.2007.905706Kwon, H., & Choi, H.-J. (2012). A time-sequential mutli-view autostereoscopic display without resolution loss using a multi-directional backlight unit and an LCD panel. Stereoscopic Displays and Applications XXIII. doi:10.1117/12.907793Livingston, M. A., Zanbaka, C., Swan, J. E., & Smallman, H. S. (s. f.). Objective measures for the effectiveness of augmented reality. IEEE Proceedings. VR 2005. Virtual Reality, 2005. doi:10.1109/vr.2005.1492798Monahan, T., McArdle, G., & Bertolotto, M. (2008). Virtual reality for collaborative e-learning. Computers & Education, 50(4), 1339-1353. doi:10.1016/j.compedu.2006.12.008Montgomery, D. J., Woodgate, G. J., Jacobs, A. M. S., Harrold, J., & Ezra, D. (2001). Performance of a flat-panel display system convertible between 2D and autostereoscopic 3D modes. Stereoscopic Displays and Virtual Reality Systems VIII. doi:10.1117/12.430813Morphew, M. E., Shively, J. R., & Casey, D. (2004). Helmet-mounted displays for unmanned aerial vehicle control. Helmet- and Head-Mounted Displays IX: Technologies and Applications. doi:10.1117/12.541031Pan, Z., Cheok, A. D., Yang, H., Zhu, J., & Shi, J. (2006). Virtual reality and mixed reality for virtual learning environments. Computers & Graphics, 30(1), 20-28. doi:10.1016/j.cag.2005.10.004Petkov, E. G. (2010). Educational Virtual Reality through a Multiview Autostereoscopic 3D Display. Innovations in Computing Sciences and Software Engineering, 505-508. doi:10.1007/978-90-481-9112-3_86Shen, Y., Ong, S. K., & Nee, A. Y. C. (2011). Vision-Based Hand Interaction in Augmented Reality Environment. International Journal of Human-Computer Interaction, 27(6), 523-544. doi:10.1080/10447318.2011.555297Swan, J. E., Jones, A., Kolstad, E., Livingston, M. A., & Smallman, H. S. (2007). Egocentric depth judgments in optical, see-through augmented reality. IEEE Transactions on Visualization and Computer Graphics, 13(3), 429-442. doi:10.1109/tvcg.2007.1035Urey, H., Chellappan, K. V., Erden, E., & Surman, P. (2011). State of the Art in Stereoscopic and Autostereoscopic Displays. Proceedings of the IEEE, 99(4), 540-555. doi:10.1109/jproc.2010.2098351Zhang, Y., Ji, Q., and Zhang, W., 2010. Multi-view autostereoscopic 3D display.In: International conference on optics photonics and energy engineering, 10–11 May 2010, Wuhan, China. Washington, DC: IEEE Computer Society, 58–61

    COMUNIDAD DE AVES DEL BOSQUE SECO TROPICAL EN LA MESA DE XÉRIDAS, SANTANDER, COLOMBIA

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    Resumen  ∙  La caracterización de la avifauna en ecosistemas constituye información de base esencial para guiar estrategias de uso de los ambientes y su conservación. En dicho marco, se evaluó la composición y estructura de las comunidades de aves de sotobosque en tres microcuencas de la Mesa de Xéridas, en el bosque seco del cañón del Chicamocha, la parte de bosque seco más extensa de Colombia. Se evaluaron estos componentes a diferentes rangos de elevación, y épocas climáticas mediante muestreos con redes de niebla. Con 18.900 metros por hora red, se registraron 91 especies de 29 familias. Los índices de diversidad por microcuenca fueron similares, pero encontramos diferencias entre rangos altitudinales con mayores valores en la Totumera y en la época de transición. La estructura de las comunidades, comparando rangos/abundancias, en todas las microcuencas por altura y época correspondieron a un modelo log‐normal. Las tres microcuencas presentan similitud por encima del 50% en composición según el índice de Sorensen. Los parámetros climáticos de temperatura y humedad variaron, presentando temperaturas más elevadas y menor humedad en las zonas más bajas, así como por épocas climáticas, menos en una de las tres microcuencas. La avifauna de los bosques secos tropicales presenta estabilidad temporal en la zona de estudio, con un grupo de especies núcleo permanente. Dado que este ecosistema está considerado en alto riesgo, conocer la composición de la comunidad de aves a lo largo del tiempo y espacio, facilita la toma de decisiones de uso y conservación. Abstract ∙ Bird communities in a tropical dry forest at Mesa de Xéridas, Santander, Colombia The characterization of bird assemblages constitutes key baseline information to guide plans of environmental land use and conservation. Here, we evaluated the composition and structure of understory bird communities in three micro‐basins of Mesa de Xéridas, in the dry forest of Chicamocha Canyon, Colombia 's most extensive dry forest area. Bird assemblages were studied at different elevations and climatic seasons by means of mist netting. Based on 18,900 m of mist net/hour, we recorded 91 species of 29 families. The sub‐basin diversity indexes were similar, but showing differences between altitudinal ranges and climatic season, with higher values in Totumera and during the transition season from dry to rainy. The structure of the communities, comparing rank/abundances, in all sub‐basins by elevation and season, corresponded to a log‐normal model. Temperature and humidity varied between most heights and climatic seasons, except in one of the three sub‐basins, showing higher temperature values at lower elevations, as well as significantly lower relative humidity. Our results suggest that the studied bird assemblages are temporally stable, mainly due to a set of permanent core species. Given that this ecosystem is considered at high risk, knowing the composition of the community in different seasons and at various elevations, provides baseline information useful for decision‐making in land use and conservation.

    Machine Learning and Virtual Reality on Body Movements¿ Behaviors to Classify Children with Autism Spectrum Disorder

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    [EN] Autism spectrum disorder (ASD) is mostly diagnosed according to behavioral symptoms in sensory, social, and motor domains. Improper motor functioning, during diagnosis, involves the qualitative evaluation of stereotyped and repetitive behaviors, while quantitative methods that classify body movements' frequencies of children with ASD are less addressed. Recent advances in neuroscience, technology, and data analysis techniques are improving the quantitative and ecological validity methods to measure specific functioning in ASD children. On one side, cutting-edge technologies, such as cameras, sensors, and virtual reality can accurately detect and classify behavioral biomarkers, as body movements in real-life simulations. On the other, machine-learning techniques are showing the potential for identifying and classifying patients' subgroups. Starting from these premises, three real-simulated imitation tasks have been implemented in a virtual reality system whose aim is to investigate if machine-learning methods on movement features and frequency could be useful in discriminating ASD children from children with typical neurodevelopment. In this experiment, 24 children with ASD and 25 children with typical neurodevelopment participated in a multimodal virtual reality experience, and changes in their body movements were tracked by a depth sensor camera during the presentation of visual, auditive, and olfactive stimuli. The main results showed that ASD children presented larger body movements than TD children, and that head, trunk, and feet represent the maximum classification with an accuracy of 82.98%. Regarding stimuli, visual condition showed the highest accuracy (89.36%), followed by the visual-auditive stimuli (74.47%), and visual-auditive-olfactory stimuli (70.21%). Finally, the head showed the most consistent performance along with the stimuli, from 80.85% in visual to 89.36% in visual-auditive-olfactory condition. The findings showed the feasibility of applying machine learning and virtual reality to identify body movements' biomarkers that could contribute to improving ASD diagnosis.This work was supported by the Spanish Ministry of Economy, Industry, and Competitiveness funded project "Immersive virtual environment for the evaluation and training of children with autism spectrum disorder: T Room" (IDI-20170912) and by the Generalitat Valenciana funded project REBRAND (PROMETEO/2019/105). Furthermore, this work was co-founded by the European Union through the Operational Program of the European Regional development Fund (ERDF) of the Valencian Community 2014-2020 (IDIFEDER/2018/029).Alcañiz Raya, ML.; Marín-Morales, J.; Minissi, ME.; Teruel Garcia, G.; Abad, L.; Chicchi-Giglioli, IA. (2020). 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Recognizing stereotypical motor movements in the laboratory and classroom. Proceedings of the 11th international conference on Ubiquitous computing. doi:10.1145/1620545.1620555Pyles, D. A. M., Riordan, M. M., & Bailey, J. S. (1997). The stereotypy analysis: An instrument for examining environmental variables associated with differential rates of stereotypic behavior. Research in Developmental Disabilities, 18(1), 11-38. doi:10.1016/s0891-4222(96)00034-0Nosek, B. A., Hawkins, C. B., & Frazier, R. S. (2011). Implicit social cognition: from measures to mechanisms. Trends in Cognitive Sciences, 15(4), 152-159. doi:10.1016/j.tics.2011.01.005Forscher, P. S., Lai, C. K., Axt, J. R., Ebersole, C. R., Herman, M., Devine, P. G., & Nosek, B. A. (2019). A meta-analysis of procedures to change implicit measures. Journal of Personality and Social Psychology, 117(3), 522-559. doi:10.1037/pspa0000160LeDoux, J. E., & Pine, D. S. (2016). Using Neuroscience to Help Understand Fear and Anxiety: A Two-System Framework. American Journal of Psychiatry, 173(11), 1083-1093. doi:10.1176/appi.ajp.2016.16030353Fenning, R. M., Baker, J. K., Baucom, B. R., Erath, S. A., Howland, M. A., & Moffitt, J. (2017). Electrodermal Variability and Symptom Severity in Children with Autism Spectrum Disorder. Journal of Autism and Developmental Disorders, 47(4), 1062-1072. doi:10.1007/s10803-016-3021-0Nikula, R. (1991). Psychological Correlates of Nonspecific Skin Conductance Responses. Psychophysiology, 28(1), 86-90. doi:10.1111/j.1469-8986.1991.tb03392.xAlcañiz Raya, M., Chicchi Giglioli, I. A., Marín-Morales, J., Higuera-Trujillo, J. L., Olmos, E., Minissi, M. E., … Abad, L. (2020). Application of Supervised Machine Learning for Behavioral Biomarkers of Autism Spectrum Disorder Based on Electrodermal Activity and Virtual Reality. Frontiers in Human Neuroscience, 14. doi:10.3389/fnhum.2020.00090Cunningham, W. A., Raye, C. L., & Johnson, M. 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V., Lebow, J., Bal, E., Lamb, D., Harden, E., Kramer, A., … Porges, S. W. (2009). Electroencephalogram and Heart Rate Regulation to Familiar and Unfamiliar People in Children With Autism Spectrum Disorders. Child Development, 80(4), 1118-1133. doi:10.1111/j.1467-8624.2009.01320.xCoronato, A., De Pietro, G., & Paragliola, G. (2014). A situation-aware system for the detection of motion disorders of patients with Autism Spectrum Disorders. Expert Systems with Applications, 41(17), 7868-7877. doi:10.1016/j.eswa.2014.05.011Goodwin, M. S., Intille, S. S., Albinali, F., & Velicer, W. F. (2010). Automated Detection of Stereotypical Motor Movements. Journal of Autism and Developmental Disorders, 41(6), 770-782. doi:10.1007/s10803-010-1102-zRodrigues, J. L., Gonçalves, N., Costa, S., & Soares, F. (2013). Stereotyped movement recognition in children with ASD. 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    Towards multisensory storytelling with taste and flavor

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    Film makers, producers, and theaters have continuously looked at ways to embody and/or integrate multiple sensory cues in the experiences they deliver. Here, we present a reflection on past attempts, lessons learnt, and future directions for the community around multisensory TV, film, and multimedia as a historical, though renewed, space of content creation. In particular, we present an overview of what we call "tasty film", that is, film involving taste, flavor, and more broadly food and drink inputs, to influence the audience experience. We suggest that such elements should be considered beyond "add-ons" in film experiences. We advocate for experimentation with new kinds of storytelling taking inspiration from multisensory design research and work on sensory substitution. We position this article as a starting point for anyone interested in multisensory film involving taste, flavor, and foods
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