Francisco R. Feito

• PhD
• Professor (Full) at University of Jaén

This paper presents an efficient approach to automatic agrivoltaic site selection, integrating a user-friendly interface with the Analytic Hierarchy Process (AHP) for multicriteria decision-making and advanced geospatial analysis. The goal is to empower users, including non-experts, with a practical tool for informed decision-making. Users provide...

Com seu clima favorável para a produção solar, a Espanha é um local ideal para sistemas agrovoltaicos, que combina agricultura e sistemas fotovoltaicos para gerar energia renovável, mas a seleção inadequada de locais pode comprometer a produção. O estudo concentra-se na região da Andaluzia, Espanha, utilizando métodos de decisão multicritério basea...

Classifying grapevine varieties is crucial in precision viticulture, as it allows for accurate estimation of vineyard row growth for different varieties and ensures authenticity in the wine industry. This task can be performed with time-consuming destructive methods, including data collection and analysis in the laboratory. In contrast, unmanned ae...

Archaeological recording is intended to preserve as much information as possible about the finds. However, once the pieces are removed from the site, there is information regarding the original positioning of these pieces that may be lost or not accurately recorded and can be relevant for further studies. This spatial arrangement can also be crucia...

The reconstruction of 3D point clouds from image datasets is a time-consuming task that has been frequently solved by performing photogrammetric techniques on every data source. This work presents an approach to efficiently build large and dense point clouds from co-acquired images. In our case study, the sensors co-acquire visible as well as therm...

Thermal imaging has been widely used for the inspection of human-made and natural scenarios, from electrical installations and advanced machinery to buildings. Regarding buildings, it can be used to assess problems concerning heat, airflows, and water. Hence, thermography has been increasingly applied to the energy efficiency of new and old buildin...

3D point clouds have a significant impact on a wide range of applications, although their acquisition is frequently conditioned by the occlusion of the objects in the scene. To address this problem, this paper describes an approach for optimizing LiDAR (Light Detection and Ranging) surveys using metaheuristics such as local searches and genetic alg...

The reconstruction of tree branching structures is a longstanding problem in Computer Graphics which has been studied over several data sources, from photogrammetry point clouds to Terrestrial and Aerial Laser Imaging Detection and Ranging technology. However, most data sources present acquisition errors that make the reconstruction more challengin...

In any productive sector, predictive tools are crucial for optimal management and decision-making. In the health sector, it is especially important to have information available in advance, as this not only means optimizing resources, but also improving patient care. This work focuses on the management of healthcare resources in primary care centre...

Background and objective: The analysis of the features of certain tissues is required by many procedures of modern medicine, allowing the development of more efficient treatments. The recognition of landmarks allows the planning of orthopedic and trauma surgical procedures, such as the design of prostheses or the treatment of fractures. Formerly,...

Accepted: 22 August 2022 / Published: 31 August 2022 (This article belongs to the Special Issue Internet and Computers for Agriculture) Download PDF Browse Figures Review Reports Citation Export Abstract Predictive systems are a crucial tool in management and decision-making in any productive sector. In the case of agriculture, it is especially int...

Tree modeling has been extensively studied in computer graphics. Recent advances in the development of high-resolution sensors and data processing techniques are extremely useful for collecting 3D datasets of real-world trees and generating increasingly plausible branching structures. The wide availability of versatile acquisition platforms allows...

This work describes an efficient approach for generating large 3D thermal point clouds considering the occlusion of camera viewpoints. For that purpose, RGB and thermal imagery are first corrected and fused with an intensity correlation-based algorithm. Then, absolute temperature values are obtained from the normalized data. Finally, thermal imager...

The generation of realistic natural scenarios is a longstanding and ongoing challenge in Computer Graphics. LiDAR (Laser Imaging Detection and Ranging) point clouds have been gaining interest for the representation and analysis of real-world scenarios. However, the output of these sensors is conditioned by several parameters, including, but not lim...

Hyperspectral data are being increasingly used for the characterization and understanding of real-world scenarios. In this field, UAV-based sensors bring the opportunity to collect multiple samples from different viewpoints. Thus, light-material interactions of real objects may be observed in outdoor scenarios with a significant spatial resolution...

In this work, we present an efficient GPU-based LiDAR scanner simulator. Laser-based scanning is a useful tool for applications ranging from reverse engineering or quality control at an object scale to large-scale environmental monitoring or topographic mapping. Beyond that, other specific applications require a large amount of LiDAR data during de...

The generation of realistic natural scenarios is a longstanding and ongoing challenge in Computer Graphics. A common source of real-environmental scenarios is open point cloud datasets acquired by LiDAR (Laser Imaging Detection and Ranging) devices. However, these data have low density and are not able to provide sufficiently detailed environments....

Modelling of material appearance from reflectance measurements has become increasingly prevalent due to the development of novel methodologies in Computer Graphics. In the last few years, some advances have been made in measuring the light-material interactions, by employing goniometers/reflectometers under specific laboratory’s constraints. A wide...

Thermal infrared (TIR) images acquired from Unmanned Aircraft Vehicles (UAV) are gaining scientific interest in a wide variety of fields. However, the reconstruction of three-dimensional (3D) point clouds utilizing consumer-grade TIR images presents multiple drawbacks as a consequence of low-resolution and induced aberrations. Consequently, these p...

This paper presents a GPU-based LiDAR simulator to generate large datasets of ground-truth point clouds. LiDAR technology has significantly increased its impact on academic and industrial environments. However, some of its applications require a large amount of annotated LiDAR data. Furthermore, there exist many types of LiDAR sensors. Therefore, d...

Figure 1: Performance comparison: OpenGL and CUDA implementations for a dataset of 271 million points and 1352 different viewpoints. Abstract Three-dimensional point clouds have conventionally been used along with several sources of information. This fusion can be performed by projecting the point cloud into the image plane and retrieving additiona...

El problema denominado Intrinsic Image Decomposition sigue siendo un desafío por resolver en informática gráfica. Aunque el uso de arquitecturas de aprendizaje profundo supondría un avance significativo, los conjuntos de datos de entrenamiento utilizados son aún reducidos. En este estudio se presenta una metodología para la generación de imágenes y...

Purpose: Virtual reality has been used as a training platform in medicine, allowing the repetition of a situation/scenario as many times as needed and making it patient-specific prior to an operation. Of special interest is the minimally invasive plate osteosynthesis (MIPO). It represents a novel technique for orthopedic trauma surgery, but requir...

Materials represented by measured BRDF (Bidirectional Reflectance Distribution function) with reflectance data captured from real-world materials have become increasingly prevalent due to the development of novel measurement approaches. Nowadays, important limitations can be highlighted in the current material scanning process, mostly related to th...

The three-dimensional virtualization of ceramic models uses archaeological drawings as one of its bases. A lack of normalisation in the graphic representation is one of the main problems that hinder the work of automatic vectorisation, given that traditional programming algorithms do not have the capacity for generalisation. In this study, we propo...

Hyperspectral sensors mounted in unmanned aerial vehicles (UAVs) offer new opportunities to explore high-resolution multi-temporal spectral analysis in remote sensing applications. Nevertheless, the use of hyperspectral data still poses challenges mainly in postprocessing to correct from high geometric deformation of images. In general, the acquisi...

Multiple types of images provide useful information about a crop, but image fusion is still a challenge in Precision Agriculture (PA). We describe a framework which manages a multi-layer registration model of heterogeneous images obtained by an unmanned aerial vehicle (UAV) by proposing pair-to-pair steps through a registration method invariant to...

Mixed reality (MR) enables a novel way to visualize virtual objects on real scenarios considering physical constraints. This technology arises with other significant advances in the field of sensors fusion for human-centric 3D capturing. Recent advances for scanning the user environment, real-time visualization and 3D vision using ubiquitous system...

The optimisation of vineyards management requires efficient and automated methods able to identify individual plants. In the last few years, Unmanned Aerial Vehicles (UAVs) have become one of the main sources of remote sensing information for Precision Viticulture (PV) applications. In fact, high resolution UAV-based imagery offers a unique capabil...

Source code of an implementation of the algorithm using modern OpenGL (4.0+).

In recent years, the application of geomatics tools in archaeology has proved to be very useful to obtain meaningful knowledge of the 3D reconstruction of archaeological remains and semantic classification of the 3D surface. These techniques have proven to be an effective solution for the 3D modeling and the extraction of many spatial features on a...

The characterization of 3D vegetation structures is an important topic, which has been addressed by recent research in remote sensing. The forest inventory requires the proper extraction of accurate structural and functional features of individual trees. This paper presents a novel methodology to study the impact of the canopy reflectance on the 3D...

An accurate identification of bone features is required by modern orthopedics to improve patient recovery. The analysis of landmarks enables the planning of a fracture reduction surgery, designing prostheses or fixation devices, and showing deformities accurately. The recognition of these features was previously performed manually. However, this lo...

The characterization of natural spaces by the precise observation of their material properties is highly demanded in remote sensing and computer vision. The production of novel sensors enables the collection of heterogeneous data to get a comprehensive knowledge of the living and non-living entities in the ecosystem. The high resolution of consumer...

3D plant structure observation and characterization to get a comprehensive knowledge about the plant status still poses a challenge in Precision Agriculture (PA). The complex branching and self-hidden geometry in the plant canopy are some of the existing problems for the 3D reconstruction of vegetation. In this paper, we propose a novel application...

The integral management of facilities located in the subsoil or hidden in walls and ceilings entails numerous challenges in terms of accurate positioning and data update.We describe the characteristics of the information system designed to act in the life cycle of facilities networks.We focus on the data model design, whose core connects topologica...

Virtual and augmented reality have been used to assist and improve human capabilities in many fields. Most recent advances allow the usage of these technologies for personal and professional purposes. In particular, they have been progressively introduced in many medical procedures since the last century. Thanks to immersive training systems and a...

The work presented has the scope of the analysis of environmental sustainability, and more specifically, in agriculture. Agriculture is a fundamental sector in the Spanish economy and even more in the region of Andalusia, being the main exponent the cultivation of olive grove. However, despite the mechanization achieved in most of the cultivation p...

This paper presents first steps for the development of a 3D Farm Management Information System (FMIS), which involves a simulation model of a virtual olive tree plantation based on the fusion of real data from different sensors. It may be used for several purposes ranging from improvement of the irrigation system, plant growth estimation with proce...

In this paper, we address the problem of collision detection between very high resolution polygonal models. We propose an approach that uses the EBP-Octree data structure in a single-core CPU architecture. The algorithm manages a set of files to support a cache-like out-of-core algorithm that performs the collision and intersection tests. Our metho...

Multi-lens multispectral cameras allow us to record multispectral information for a whole area of terrain, even though we may only need the vegetation data. Based on the intensity of each multispectral image we can retrieve the contours of the trees that appear on the recorded terrain. However, multispectral cameras use a physically different lens...

Currently, customer relationship management (CRM) tools are very important in our society because they provide a comunication channel to the healthcare system for patients. Salud Responde is a CRM that provides many health services for the entire population of Andalusia, in southern Spain. The number and frequenzy of phone calls received change alo...

The automatic recognition of real environments has become a relevant issue for multiple purposes in computer graphics, computer vision and artificial intelligence. In this work, we focus on environment understanding according to input CAD models for an Augmented Reality (AR) application. We provide a novel solution for the management of building in...

Augmented reality (AR) has experienced a breakthrough in many areas of application thanks to cheaper hardware and a strong industry commitment. In the field of management of urban facilities, this technology allows virtual access and interaction with hidden underground elements. This paper presents a new approach to enable AR in mobile devices such...

This paper presents a formal framework for the representation of three-dimensional geospatial data and the definition of common geographic information system (GIS) spatial operations. We use the compact stack-based representation of terrains (SBRT) in order to model geological volumetric data, both at the surface and subsurface levels, thus prevent...

In this article, we introduce a novel occlusion culling method working on the server side to provide real-time navigation on web-based systems. Nowadays, virtual navigation in urban environments is a rising trend in several contexts such as tourism, GPS navigation systems, and video games. A city environment is usually associated with a complex dat...

Several geospatial problems like urban subsurface analysis involve data from multiple domains and nature. For instance, an urban infrastructure analysis must take into account not only the urban elements but their geological environment. This requires the definition of hybrid schemes and algorithms that keep the dimensionality and domain of the dat...

Real-time visualization in web-based system remains challenging due to the amount of information associated to a 3D urban models. However, these 3D models are not able to provide advanced management of urban infrastructures, such as underground facilities. Nowadays, 3D GIS is considered the appropriate tool to provide accurate analysis and decision...

Geological structures, both at the surface and subsurface levels, are typically represented by means of voxel data. This model presents a major drawback: its large storage requirements. In this paper, we address this problem and propose the use of a stack-based representation for geological surface-subsurface structures. Although this representatio...

The digitization process for religious artifacts is subject to inherent difficulties often ignored in theoretical models or pipelines. In this paper we aim to describe these problems, which are present in practical environments such as temples and churches, using white light scanners instead of other common devices or technologies such as laser sca...

Human and medical resources in the Spanish primary health care centres are usually planned and managed on the basis of the average number of patients in previous years. However, sudden increases in patient demand leading to delays and slip-ups can occur at any time without warning. This paper describes a predictive model capable of calculating pati...

In this paper we address the problem of fast inclusion tests and distance calculation in very large models, an important issue in the context of environments involving haptic interaction or collision detection. Unfortunately, existing haptic rendering or collision detection toolkits cannot handle polygonal models obtained from 3D digitized point cl...

A spherical photo is an image that it can show a scene and the user can interact with its. We are working in the Jaén’s cathedral. We are giving the possibility of a virtual visit with good results in many points at this place. We labored with a camera called Lady Bug 2. It can take spherical photo very easy. We used some web tools where we share a...

The continued availability of products at any store is the major issue in order to provide good customer service. If the store is a drugstore this matter reaches a greater importance, as out of stock of a drug when there is high demand causes problems and tensions in the healthcare system. There are numerous studies of the impact this issue has on...

Large point clouds from radars and these-dimensional scanners are commonly used in Archaeology. However, in most cases these models cannot be properly integrated and used in software such as heritage management due to its large size. Therefore, some tools to make this management easier and optimize the processing are needed. In this work, we propon...

In this paper we describe the methodology carried out in the Cathedral of Jaen (Spain) during the scanning, processing of the resulting point clouds and the post-processing into a three-dimensional model. The virtual cathedral is placed in a web-site using WebGL in order to be visited and admired in detail.

Many real objects are heterogeneous. They are composed of diverse materials, which are present in varying proportions. Materials inside the solid do not have to be uniformly distributed. So, methods capable of accurately model not only the boundary of the solid, but also the distribution of material in every single point of its interior, are needed...

In this paper we present a deferred method for evaluating a complete CSG tree based on triangulated solids. It allows the exact evaluation of the surface of the entire model in a single step, using regularized Boolean classifications. The overall performance with this approach is better than with the classical method, which incrementally evaluates...

Management, interpretation and visualization of geoscientific and atmospherical information is a major problem for the geoscientist and for a correct diffusion, due to its high volume, complexity, spatiotemporal dimension and three-dimensional nature. As a result, development of software tools for integration, exploration and graphical analysis of...

"Incentivized Sustainable Mobility" is a conceptual business model which involves four stakeholders: citizens, municipalities, commerce and mobility services. A platform named "ISUMO" (Incentivized Sustainable Mobility) provides technological support to this business model, integrating a set of metaservices that unifies the existing ICTs of transpo...

Three dimensional (3D) Geographic Information Systems (GIS) are the appropriate systems for storing, manipulating and visualizing spatial data in urban environments. Providing web-based interaction to these systems is quite challenging. In this paper we present the techniques and protocols incorporated into a web-based prototype for navigation and...

Objective: The aim of this article is to demonstrate the importance of the role a health CRM can play in a pandemic or health alert. During the influenza-A pandemic, Salud Responde played a very important role. Its main objective was to establish protocols and citizens advice lines that would avoid patients with mild influenza-A symptoms going to...

An optimal resource management in health care centers implies the use of an appropriate timetabling scheme to schedule appointments. Timetables of health centers are usually divided into time slots whose duration is equal to time required for clinical attendance. However doctors perform a series of tasks that are not always clinical in nature: issu...

Abstract Formal models can be useful in computer graphics as a conceptual framework supporting representation systems. This allows to formally derive properties and algorithms and proof their correctness and validity. This paper describes a formal model based on a geometric algebra. This algebra has been used to obtain specific representation syste...

Objective The aim of this article is to demonstrate the importance of the role a health CRM can play in a pandemic or health alert. During the influenza-A pandemic, Salud Responde played a very important role. Its main objective was to establish protocols and citizens advice lines that would avoid patients with mild influenza-A symptoms going to he...

The automatic process for texturing 3D urban environments realistically is a challenging topic in Computer Graphics, especially when the model is generated from 2D GIS data from real sites. In order to achieve realistic scenes, buildings, urban furniture and street roadways should be modeled automatically also considering the slope of steep streets...

In this paper we present a robust and accurate method for evaluating regularized Boolean operations on triangulated solids. It allows the exact evaluation of the regularized union, intersection, difference and symmetric difference simultaneously. Moreover, this approach is simpler than other methods, including those that provide an approximate eval...

The growing demand for virtual urban models in emerging areas of interest has promoted a variety of techniques for automating the creation of virtual scenes with a high level of realism. However, visualization is not always the only aim in many applications. Increasingly, urban systems are also required for management, analysis, or interaction with...

Paralelamente al desarrollo de las nuevas tecnologías, los Museos virtuales han ido evolucionando e incorporando contenidos con el objetivo de facilitar la transmisión del conocimiento. Para que estos nuevos elementos resulten útiles y accesibles para el usuario final, se deben incluir considerando no sólo aspectos técnicos sino también de usabilid...

Virtual museums have incorporated new contents which make the knowledge transmission easier, thanks to the development of the new technologies. Evidently, it would be desirable that all these new elements could be accessed using any mobile device. In this paper we study the main graphical languages to create 3D virtual museums and the process to ad...

Precision agriculture has progressed in integrating different techniques, but nowadays the environmental and economic benefits of implementing the concept remain unproven. This is the first study that analyzes the agronomic and economic impact of the application of precision agriculture to a specific crop. This paper presents a study applied to oli...

The phenomenon of erosion is increasingly analyzed from different perspectives by interdisciplinary working groups attempting to implement more effective preventive measures. Numerical data are normally used to quantify the effects of erosion. This paper examines the case of an olive grove where there is clear evidence of the progress of erosion. S...

A method for the semiautomatic detection of the topology of building floors represented as CAD drawings stored in vector file format is presented in this paper. This method involves the detection of walls and joint points amid walls and openings, and the search of intersection points amid walls.To give support to the wall detection process, this pa...

The process of rendering and interacting with large scenes in web systems is still an open problem in 3D urban environments. In this paper we propose a prototype to visualize a city model in a client-server architecture using open-source technologies like WebGL and X3DOM. Moreover, free navigation around the scene is allowed and users are able to o...

Erosion in agricultural areas is accentuated by the effects of meteorological factors, tillage practices and the slope of the land. This latter effect leads to surface runoff which in turn causes the soil erosion. To carry out erosion models is necessary to use spatial data, like DEM, slopes models or analysis of the 3D movements of the object poin...

The localization of the components of an object near to a device before obtaining the real interaction is usually determined by means of a proximity measurement to the device of the object’s features. In order to do this efficiently, hierarchical decompositions are used, so that the features of the objects are classified into several types of cells...

This work describes the EL-REP, a new 2D decomposition scheme with interesting properties and applications. The EL-REP can be computed for one or more simple polygons of any kind: convex or non-convex, with or without holes and even with several shells. A method for constructing this decomposition is described in detail, together with several of it...

This paper presents a method to evaluate Boolean operations between free-form solids modeled using Extended Simplicial Chains (ESCs). The ESC model is a formal system to represent not only the boundary, but also the volume of free-form solids, that allows the development of simple and robust algorithms. In this implementation of the ESC model, the...