Paulo Dias

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Verified

Paulo verified their affiliation via an institutional email.

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• PhD
• Professor (Assistant) at University of Aveiro

Viruses operate on a microscopic scale, and their behavior involves intricate interactions at a molecular level. The complex and dynamic nature of viral transmission pathways, host interactions, and mutation processes adds a layer of abstraction that requires students to engage in imaginative thinking. Thus, traditional approaches rely- ing on stat...

Reflective surfaces are notoriously difficult to detect and reconstruct, as they reflect light from surrounding objects. Thus, the quality of 3D reconstructions and the performance of downstream computer vision tasks, such as navigation, depth prediction, or object detection are severely impaired by the prevalence of mirrors in indoor environments....

Three-dimensional (3D) reconstruction involves the creation of detailed models of real-world objects based on their captured shape and appearance. Originating from computer vision and graphics, this field has expanded into diverse areas such as architecture, robotics, autonomous driving, medicine, and archaeology. This tutorial will provide a compr...

In recent years, the market has seen the emergence of numerous affordable sensors, interaction devices, and displays, which have greatly facilitated the adoption of Virtual and Augmented Reality (VR/AR) across various applications. However, developing these applications requires a solid understanding of the field and specific technical skills, whic...

Remote collaboration using eXtended Reality (XR) has been explored to establish a common ground between physically distributed individuals. To achieve usable and impactful solutions, it is paramount to understand how different content creation and display methods contribute to the work effort of each member (remote and on-site). Additionally, explo...

Three-dimensional (3D) reconstruction is the creation of 3D models from the captured shape and appearance of real objects. This long-term research topic has seen significant advancements in systems and algorithms, gaining importance in various fields such as architecture, robotics, autonomous driving, medicine, agriculture, and archaeology. Despite...

Augmented Reality (AR) is a promising technology in Industry 4.0, improving industrial procedures and reducing errors. Using a Human-Centered Design methodology, a Pervasive AR tool was initially created to support logistics tasks in the shop floor. To benefit from the tool, a prior configuration of the AR environment is required. This work propose...

One of the leading causes of disability and death worldwide is stroke, affecting the arteries leading to and within the brain. To help survivors relearn lost skills, post-stroke rehabilitation becomes a paramount part of their life, focusing on attaining the best possible quality of life. Regardless, one main challenge is maintaining survivors' mot...

With the rise in popularity of different human-centred applications using 3D reconstruction data, the problem of generating photo-realistic models has become an important task. In a multiview acquisition system, particularly for large indoor scenes, the acquisition conditions will differ along the environment, causing colour differences between cap...

In recent years, a multitude of affordable sensors, interaction devices, and displays have entered the market, facilitating the adoption of Virtual and Augmented Reality (VR/AR) in various areas of application. However, the development of such applications demands a solid grasp of the field and specific technical proficiency often missing from exis...

This project presents the design and development of a Serious Game, that utilizes Augmented Reality (AR) technologies, aimed to involve and engage students in Organic Chemistry. The game’s core features encompass several missions, and a tutorial, specifically targeting the challenging concept of determining the R/S Configuration of enantiomers. It...

Stroke stands out as a significant contributor to disability and mortality rates among individuals worldwide. Despite their important role, conventional rehabilitation methods often struggle to maintain motivation due to their repetitive nature, leading to potential social and mental health repercussions. This work advocates for the integration of...

The levels of air quality found in some cities are a growing concern for environmental, healthcare, and government organizations worldwide due to the rise of environmental pollution. Thus, novel solutions for raising population awareness are of paramount importance. This work describes a platform for visualizing air quality data using Virtual Reali...

Augmented Reality (AR) instructions have proven their value in guiding individuals while fulfilling specific tasks in various areas of application. Compared to more traditional approaches, AR-solutions enable decreasing errors and diminishing the time required to accomplish such tasks. Regardless, the vast majority of such solutions focused on rath...

Solutions exploring Mixed Reality (MR) have been applied to re- mote scenarios, allowing to create a common ground. Literature reports that most studies focus on synchronous scenarios (team members interact in real-time). Therefore, an opportunity exists for asynchronous situations, in which collaborative actions occur at different moments and in w...

Augmented reality (AR) is increasingly considered to support scenarios of co-located and remote collaboration. Thus far, the core goal has been advancing the supporting technologies and assessing how they perform to inform design and development, thus providing support toward their maturity. Nevertheless, while understanding the performance and imp...

Augmented Reality (AR) has the ability to display and interact with additional information aligned with the real world and to support context-driven visualization techniques. Situated Visualization (SV) is a method to represent data in a context that encompasses all the visualizations that change their appearance based on context. Therefore, since...

As remote work becomes broadly adopted worldwide due to the recent COVID-19 Pandemic, individuals turn to new digital technologies to address the characteristics of such scenarios. An example is the use of Mixed Reality (MR) to establish a common ground between physically distributed team members. Although existing literature has proposed multiple...

Changes experienced in the business landscape over the past years exacerbated by COVID-19 remain unprecedented, e.g., adaptability in the processes, and remote work, among others. One important change that resulted from this, was the accelerated switch from conducting on-site physical activities to more remote scenarios that continued to ensure suc...

Raising public awareness about air quality is crucial for promoting individual and collective actions to mitigate the harmful effects of air pollution and achieve a healthier and more sustainable environment. This article presents an application that uses Augmented Reality (AR) and Situated Visualization (SV) to increase public awareness of air qua...

Upper limb paresis occurs quite commonly after stroke and may result in the affected limb’s disuse or learned non-use. As a result, its cortical representation may be suppressed, further inhibiting its spontaneous utilization, resulting in motor function deterioration, increase in spasticity, joint stiffness and pain. The aim of this work was to in...

To fully leverage the benefits of augmented and mixed reality (AR/MR) in supporting users, it is crucial to establish a consistent and well-defined situated visualization (SV) model. SV encompasses visualizations that adapt based on context, considering the relevant visualizations within their physical display environment. Recognizing the potential...

Solutions using Augmented Reality (AR) have been explored in recent times to address scenarios of remote collaboration in which team members are physically distributed. The literature illustrates that various user studies have been conducted to handle multiple types of tasks through the use of distinct AR methods and hardware. Regardless, given the...

Augmented Reality (AR) is a pillar of the transition to Industry 4.0 and smart manufacturing. It can facilitate training, maintenance, assembly, quality control, remote collaboration and other tasks. AR has the potential to revolutionize the way information is accessed, used and exchanged, extending user's perception and improving their performance...

Collecting real-world data is often considered the bottleneck of Artificial Intelligence, stalling the research progress in several fields, one of which is camera localization. End-to-end camera localization methods are still outperformed by traditional methods, and we argue that the inconsistencies associated with the data collection techniques ar...

Remote collaboration using Mixed Reality (MR) enable off-site experts to assist on-site collaborators needing guidance. Different types of visualizations have been proposed for sharing situated information , e.g., embedded, non-embedded, others. However, the effectiveness of these visualizations have not been compared. This work describes a user st...

Activities of remote guidance are essential in the Industry sector to overcome emerging problems. One important technology to create a common ground between distributed team-members is Mixed Reality (MR). On-site collaborators can receive instructions from remote experts, informing where to act, and what to do. Nevertheless , most studies have focu...

Industry 4.0 is the latest industrial revolution, tend to seamlessly integrate digital and physical worlds into industrial procedures in an effort to better support different stakeholders’ needs. This work proposes a Pervasive Augmented Reality (AR) first prototype, developed in collaboration with industrial partners, to support real-time data moni...

The 2nd International Workshop on the eXtended Reality for Industrial and Occupational Supports (XRIOS) aims to identify the current state of XR research and the gaps in the scope of human factors and ergonomics, mainly related to industrial and occupational tasks, and discuss potential future research directions. XRIOS was held for the first time...

This work presents a novel framework for web-based environment-aware rendering and interaction in augmented reality based on WebXR and three.js. It aims at accelerating the development of device-agnostic Augmented Reality (AR) applications. The solution allows for a realistic rendering of 3D elements, handles geometry occlusion, casts shadows of vi...

A common practice in scenarios of remote collaboration is to provide a representation from distributed team members, aiming to positively influence the level of social presence and in turn the work effort. Nevertheless, these stimuli can lead to fractured learning experiences, since collaborators need to split attention among the task, the shared i...

Texture mapping can be defined as the colorization of a 3D mesh using one or multiple images. In the case of multiple images, this process often results in textured meshes with unappealing visual artifacts, known as texture seams, caused by the lack of color similarity between the images. The main goal of this work is to create textured meshes free...

Augmented Reality (AR) has tremendous capacity to assist scenarios of remote collaboration in the context of Industry 4.0, where distributed team-members with different expertise need to achieve shared targets. Solutions using AR enable integration of virtual and real-world content, empowering individuals with a common ground that improves understa...

Augmented Reality (AR) has been explored to assist scenarios of remote collaboration. Most studies use Handheld Devices to assist on-site members requiring help. However, the most suitable way to use such devices has not been examined, due to most efforts being put in the development of the technology itself. This work explored three distinct setup...

Mixed Reality (MR) has significant potential to support scenarios of remote collaboration, where distributed team-members need to establish a common understanding. However, most efforts have been devoted to explore one-to-one use-cases. This work describes a one-to-many user study with 16 participants, aimed at under- standing how an on-site team-m...

Virtual reality shows great potential as an alternative to traditional therapies for motor rehabilitation given its ability to immerse the user in engaging scenarios that abstract them from medical facilities and tedious rehabilitation exercises. This paper presents a virtual reality application that includes three serious games and that was develo...

Although Mixed Reality (MR) has been explored to support scenarios of remote collaboration, the majority of studies reported in literature have focused on synchronous use-cases, where all team-members can interact in real-time. Hence, an opportunity exist to explore asynchronous situations, in which collaborative actions take place at different tim...

Pervasive Augmented Reality (AR) has been explored to provide experiences that are continuous in space and time, while incorporating layers of contextual information. While most research efforts have been devoted to explore serious games, museums and smart environments, we argue that another interesting area of application is assistive production,...

The region interpolation methods proposed in the moving objects databases literature impose restrictions that can have a significant impact on the representation of the evolution of moving regions, in particular, when a rotation occurs between two observations. In this paper, we propose a data model for moving regions that allows moving segments to...

Augmented Reality (AR) has been applied in Industry 4.0 contexts for training, assistance, maintenance, assembly or quality control. This work describes the use of Pervasive AR to support human operators in a shop floor through pervasive experiences, while performing logistics operations. A Human-Centered Design methodology with partners from the i...

Texture mapping of 3D models using multiple images often results in textured meshes with unappealing visual artifacts known as texture seams. These artifacts can be more or less visible, depending on the color similarity between the images. The main goal of this paper is to produce seamlessly textured meshes from indoor scenarios through a process...

Virtual Reality (VR) has enormous potential to support training sce- narios in the most diverse areas of application. In industry scenarios, it can allow operators to acquire new skills and higher levels of confidence before moving to real-world activities. Trainees must immerse themselves within the task space, which means using a Head-Mounted Dis...

Collaboration is essential in industrial, medical, and educational contexts, among others. It can be described as the process of interdependent activities performed to achieve a common goal between co-located or remote collaborators. One major issue of remote collaboration is the fact that collaborators don't share a common space/world. In this vei...

Augmented Reality (AR) solutions are emerging in multiple scenarios of application as Industry 4.0 takes shape. In particular, for remote collaboration, flexible mechanisms such as authoring tools can be used to generate instructions and assist human operators as they experience increased complexity in their daily tasks. In addition to the traditio...

This work proposes an augmented reality serious game (ARSG) for supporting individuals with motor disabilities while controlling robotic wheelchairs. A racing track was used as the game narrative; this included restriction areas, static and dynamic virtual objects, as well as obstacles and signs. To experience the game, a prior configuration of the...

An important issue in smart cities is intelligent mobility. In this line, the ATLASCAR project started in 2009 as a challenge to transpose to a real car many perception and navigation techniques developed for small scale vehicles in robotic competitions. Among many others, that challenge brought the need to use multiple sensors from different modal...

Situated Visualization (SV), encompassing all the visualizations that change their appearance based on context, by considering the visualizations that are relevant to the physical context in which they are displayed, has been recognized as a method with potential in many situations, as is the case of supporting decision making. Augmented and Mixed...

Augmented Reality (AR) is a powerful tool for supporting remote scenarios. Despite the broad adoption of Hand-Held Devices (HHDs), one common assumption is that Head-Mounted Displays (HMDs) may revolutionize such activities, since collaborators can visualize situated instructions given by remote experts, while in a 'hands-free' setting. This claim...

Literature shows that Extended Reality (XR) technology is a powerful tool for supporting collaboration among distributed team-members. Most of the research efforts have focused on exploring the enabling technology to support one-to-one remote scenarios. This means group size has not been a topic of interest in recent years and only limited research...

This work describes an Augmented Reality Serious Game (ARSG) focused on facilitating the process of acquiring new skills in individuals with motor disabilities. In particular, this game aims to help them control a robotic wheelchair. A racing track was used as a game narrative, including restriction areas, static and dynamic objects, obstacles and...

Most efforts on Augmented Reality (AR) remote collaboration have been devoted to on-site individuals in need of assistance. Yet, since remote experts do not have access to the local environment, it is also important to explore how different methods affect the situation understanding and interaction. This work describes a user study with 16 particip...

The fusion of data from different sensors often requires that an accurate geometric transformation between the sensors is known. The procedure by which these transformations are estimated is known as sensor calibration. The vast majority of calibration approaches focus on specific pairwise combinations of sensor modalities, unsuitable to calibrate...

Decision-making processes and decision support systems (DSS) have been improved by a variety of methods originated from several scientific fields, such as information science and artificial intelligence (AI). Situated visualization (SV) allows presenting visual data representations in context and may support better DSS. Its main characteristic is t...

This paper presents an evaluation and comparison of interaction methods for the configuration and visualization of pervasive Augmented Reality (AR) experiences using two different platforms: desktop and mobile. AR experiences consist of the enhancement of real-world environments by superimposing additional layers of information, real-time interacti...

Assembly processes require now more than ever a systematic way to improve efficiency complying with increasing product demand. Several industrial scenarios have been using augmented reality (AR) to enhance environments with different types of information and influence the overall user satisfaction and performance. The purpose of this work is to eva...

Texture mapping of 3D models using multiple images often results in textured meshes with unappealing visual artifacts known as texture seams. These artifacts can be more or less visible, depending on the color similarity between the used images. The main goal of this work is to produce textured meshes free of texture seams through a process of colo...

This paper describes a Human-Centered Design process aimed at understanding how Virtual Reality (VR) can assist in post-stroke physical rehabilitation. Based on insights from stroke survivors and healthcare professionals, a serious game prototype is proposed. We focused on upper-limb rehabilitation, which inspired the game narrative and the movemen...

This paper presents a prototype for configuration and visualization of Pervasive Augmented Reality (AR) experiences using two versions: desktop and mobile. It makes use of 3D scans from physical environments to provide a reconstructed digital representation of such spaces to the desktop version and enable positional tracking for the mobile. While t...

This work describes a user study aimed at understanding how the remote expert representation affects the sense of social presence in scenarios of remote guidance. We compared a traditional video chat solution with an Augmented Reality (AR) annotation tool. These were selected due to ongoing research with partners from the industry sector, following...

Collaboration is essential in industrial, medical, and educational contexts, among others. It can be described as the process of interdependent activities performed to achieve a common goal between co-located or remote collaborators. One major issue of remote collaboration is the fact that collaborators don't share a common space/world. In this vei...

Problem solving in Industry 4.0 often requires collaboration among remote team members, which face increased complexity on their daily tasks and require mechanisms with adaptive capabilities to share and combine knowledge. Augmented Reality (AR) is one of the most promising solutions, allowing taking advantage from seamless integration of virtual a...

There is a discussion on the potential of augmented reality (AR), mobile technologies to enhance learning. This article presents: 1) the EduPARK project's first cycle of design-based research for the development of a mobile AR game-like app that aims to promote learning in an urban park, and 2) an experience of students using it in loco. The focus...

Remote Collaboration using Augmented Reality (AR) shows great potential to establish a common ground in physically distributed scenarios where team-members need to achieve a shared goal. However, most research efforts in this field have been devoted to experiment with the enabling technology and propose methods to support its development. As the fi...

The quality of life of people with reduced mobility is an important matter and every day technology also evolves in order to help them. Intelligent wheelchairs are a result of this evolution, however, adapting to use new technologies is not always easy. Serious games can make the process of acquiring the skills to use a robotic wheelchair a fun and...

Immersive technologies have been evolving in the latest years and have currently many applications, such as training, medicine, and entertainment. Augmented Reality (AR) enables users to interact with their augmented physical environment through the overlay of digital information, yet it still has many challenges concerning how to show and to let u...

Remote collaboration using Augmented Reality (AR) has potential to support physically distributed team-members that need to achieve a common goal by increasing knowledge retention, improving understanding and awareness of the problem and its context. In this vein, the path to achieve usable, realistic and impactful solutions must entail an explicit...

Remote collaboration using Augmented Reality (AR) has enormous potential to support collaborators that need to achieve a common goal. However, there is a lack of tools for evaluating these multi-faceted contexts, involving many aspects that may influence the way collaboration occurs. Therefore, it is essential to develop solutions to monitor AR-sup...

Human operators experience increased complexity on their daily tasks, requiring flexible mechanisms with adaptive capabilities like Augmented Reality (AR) authoring tools to assist in creating content for such activities. The main challengeis the ability to create content intuitively without having to master complicated AR concepts. In this vein, w...

In many scenarios of remote collaboration, experts don’t have access to the local environment and require additional mechanisms to provide instructions and guidance in such context. Since the use of Virtual Reality (VR) and Augmented Reality (AR) is becoming more accessible, these technologies can provide an advantage in creating a shared understan...

Remote collaboration using Augmented Reality (AR) has enormous potential to support collaborators that need to achieve a common goal. However, there is a lack of tools for evaluating these multi-faceted contexts, involving many aspects that may influence the way collaboration occurs. Therefore, it is essential to develop solutions to monitor AR-sup...

To support the nuances of collaborative work, many researchers have been exploring the field of Augmented Reality (AR), aiming to assist in co-located or remote scenarios. Solutions using AR allow taking advantage from seamless integration of virtual objects and real-world objects, thus providing collaborators with a shared understanding or common...

Remote Collaboration mediated by Mixed and Augmented Reality (MR/AR) shows great potential in scenarios where physically distributed collaborators need to establish a common ground to achieve a shared goal. So far, most research efforts have been devoted to creating the enabling technology, overcoming engineering hurdles and proposing methods to su...

Quality control procedures are essential in many industrial production pipelines. These repetitive and precise tasks are frequently complex, including several steps that must be performed correctly by different operators. To facilitate these, quality control tests are often documented with static media like video recordings, photos, or diagrams. Ho...

Augmented Reality (AR) has been explored with the objective to assist in scenarios of co-located or remote collaboration. To help understand how well collaborative work can be addressed with AR, it is important to foster harmonization of perspectives and create a common ground for systematization and discussion. In this vein, understand relationshi...