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Item Unsupervised Framework for People Counting Using a Stereo-based Camera(The Eurographics Association, 2017) Negrillo, José; Feito, Francisco R.; Segura, Rafael J.; Ogayar, Carlos Javier; Fuertes, José Manuel; Lucena, Manuel; Fco. Javier Melero and Nuria PelechanoThe counting of people in a room or a building is a desirable feature in a Smart City environment. There are several hardware systems that simplify this process. However, those systems tend to be very intrusive. This paper proposes a framework for counting people using an efficient and multi-platform computer vision based system. This system is easily deployable in crowded places by using affordable components.Item Direct Volume Rendering of Stack-Based Terrains(The Eurographics Association, 2017) Graciano, Alejandro; Rueda, Antonio J.; Feito, Francisco R.; Fco. Javier Melero and Nuria PelechanoTraditionally, the rendering of volumetric terrain data, as many other scientific 3D data, has been carried out performing direct volume rendering techniques on voxel-based representations. A main problem with this kind of representation is its large memory footprint. Several solutions have emerged in order to reduce the memory consumption and improve the rendering performance. An example of this is the hierarchical data structures for space division based on octrees. Although these representations have produced excellent outcomes, especially for binary datasets, their use in data containing internal structures and organized in a layered style, as in the case of surface-subsurface terrain, still leads to a high memory usage. In this paper, we propose the use of a compact stack-based representation for 3D terrain data, allowing a real-time rendering using classic volume rendering procedures. In contrast with previous work that used this representation as an assistant for rendering purposes, we suggest its use as main data structure maintaining the whole dataset in the GPU in a compact way. Furthermore, the implementation of some visual operations included in geoscientific applications such as borehole visualization, attenuation of material layers or cross sections has been carried out.Item 3D GIS Based on WebGL for the Management of Underground Utilities(The Eurographics Association, 2017) Jurado, Juan Manuel; Ortega, Lidia; Feito, Francisco R.; Fco. Javier Melero and Nuria PelechanoThis work summarizes a web application related to a research project about underground infrastructures. The aim is to visualize, analyse and manage all underground layers inside 3D urban environments. This is possible using WebGL to develop a web application which may be used from mobile devices. The study of terrain relief to calculate the depth of these infrestructures, the conversion of 2D data to 3D models, the definition of a spatial database and the use of virtual reality to visualize the resulting 3D scene make of this application a useful tool for utility companies dealing with underground infrastructures.Item Google Tango Outdoors. Augmented Reality for Underground Infrastructures(The Eurographics Association, 2017) Soria, Gregorio; Ortega, Lidia; Feito, Francisco R.; Fco. Javier Melero and Nuria PelechanoUnderground infrastructures, which support much of the services provided to citizens, have the peculiarity of not being directly visible. This leads to problems when making incursions for maintenance or creating new installations. In this framework, new technologies related to augmented reality are of special interest. This work presents a virtual reality application using Google Tango in order to visualize underground infrastructures in situ, allowing also free navigation. The system works on a clientserver architecture. The client obtains the location point as well as the orientation of the device. The server returns the virtual visualization of infrastructure elements and buildings from this viewpoint, which will be superimposed over the actual view. The server maintains a spatial database with topological characteristics that allow this and other modes of interaction, as well as some analytical capacity. This article focuses on aspects such as the transformation of input data, the data model, the different methodologies for rapid and effective positioning, as well as the usability of the application.