Carlos Gustavo Resque dos Santos

Guidelines for Graphical User Interface Design in Mobile Augmented Reality Applications

The technological advancement of mobile devices allowed the entry of innovative technologies in users’ daily lives, due to miniaturization and advancement of sensors, cameras and computer resources. These technologies make it possible to increase the user’s interaction and perception about places and objects around him, allowing, for example, the use of augmented reality. However, this opportunity presents new challenges, such as application design and development, aspects to this new context of ubiquitous devices, heterogeneity of mobile devices, and how the user interacts with these applications. Thus, this paper aims to present the results of Mobile Augmented Reality application usability evaluation, identifying a list of problems in the application Graphical User Interface and propose some guidelines for building Graphical User Interfaces to avoid these problems. The chosen usability evaluation is the Think Aloud protocol, which was performed with 20 participants in the Mobile Augmented Reality application named ARguide.

Categorizing Issues in Mid-air InfoVis Interaction

This paper presents a starting study on InfoVis interaction through mid-air gestures, using a vision based interaction device, the Leap Motion. We present the user tests conducted and the results gathered, using a 3D Scatterplot as visualization technique. These tests aim in identify and categorize issues that can compromise InfoVis mid-air gestural interaction as a whole, not focusing on the design of the developed tool. The test tasks and results are exposed and the issues found are categorized in Boundary Awareness, Granularity and Collision and Depth Perception.

Evaluation of Information Visualization Interaction Techniques Using Gestures and Widgets in 3D Environments

This paper presents the results of usability evaluation of an Information Visualization tool with touchless gestural commands. The tool has well-known visualizations tasks implemented in itself, allowing users to interact on a 3D scatterplot visualization technique. The chosen usability evaluation was the Think Aloud protocol, together with questionnaires conducted by an interviewer, both of them performed with five participants in a controlled environment.

A Review of Ways and Strategies on How to Collaborate in Information Visualization Applications.

Design and develop collaborative methods in information visualization are a current challenge, hence understand, identify and define the current progress of developed methods to collaborate in information visualization are important. The aim of this work is to review the ways and strategies of how to collaborate in information visualization applications. We surveyed published works that present applications that implements collaborative information visualization techniques and methods. We present a micro level category of identified ways of how the InfoVis applications implements collaboration.

A Visual Representation of Clusters Characteristics Using Edge Bundling for Parallel Coordinates

This paper proposes an edge bundling approach applied on parallel coordinates to improve the visualization of cluster information directly from the overview. Lines belonging to a cluster are bundled into a single curve between axes, where the horizontal and vertical positioning of the bundling intersection (known as bundling control points) to encode pertinent information about the cluster in a given dimension, such as variance, standard deviation, mean, median, and so on. The hypothesis is that adding this information to the overview improves the visualization overview at the same that it does not prejudice the understanding in other aspects. We have performed tests with participants to compare our approach with classic parallel coordinates and other consolidated bundling technique. The results showed most of the initially proposed hypotheses to be confirmed at the end of the study, as the tasks were performed successfully in the majority of tasks maintaining a low response time in average, as well as having more aesthetic pleasing according to participants’ opinion. KeywordsEdge Bundling, Parallel Coordinates, Data Clustering.

Aspects of Voice Interaction on a Mobile Augmented Reality Application

Mobile Augmented Reality has become more popular mainly because computational resources available in mobile devices, and in the enhanced view of real world that can be seen by the user. The interaction becomes an important point for success of these applications, featuring a natural and intuitive way for the user, and the chance of one, or two hands free for other interaction or activity. Therefore, this work presents the usability analysis of a Mobile Augmented Reality, the ARGuide, with the use of a voice service for interaction. The usability test analysis is based upon the most common interaction tasks of the users in this type of application. In the end, some good practices for the application interface building and speech interaction are shown.

Suggestions for Interface Design Using Head Tracking and Voice Commands

Multimodal Interactions have been used in many fields of application, such as medicine, manipulation of assistive technologies, interactions in public environments, among others. It is important to not only develop technologies (hardware and software) but to study and project optimization possibilities for the usage of these innovative interfaces as well. This work aims to identify which are the major problems when using head tracking interactions combined with voice commands, this being a multimodal interaction. This evaluation is focused in the lowest level of interaction, which are actions more physical and less cognitive, such as click, drag and drop, scroll a page, among others. Therefore, as consequence of this research, there were proposed some suggestions to improvement of interface projects that use this form of interaction.

A Concurrent Architecture Proposal for Information Visualization Pipeline

This paper identifies an opportunity to reduce the latency in information visualization (InfoVis) systems, exploring the parallelization of the visualization pipeline architecture. We propose a concurrent architecture where the visualization pipeline stages are modified to execute as producers and consumers threads. The threads synchronization is done by memory barriers and the data flow pass the pipeline through a unique data structure, called ring buffer, which reuses a contiguous space preallocated in memory. Two InfoVis prototypes were developed in java, the first one using sequential pipeline and the other using concurrent pipeline. The results obtained with concurrent architecture in comparison with sequential pipeline presented less execution time and memory allocation for data visualization renderization.

Heuristic Evaluation of a t-Commerce InfoVis Prototype

The current Brazilian context in television audiovisual communication is in transition from analogical to digital technology. One of the main reasons for this motion towards Interactive Digital Television (iDTV) is the improvement in the user experience over this platform. Considering this motion, this work applied suitable interaction design and usability concepts from the Nielsens heuristics [5] into a visualization prototype to the support of visual analysis of products in electronic commerce over TV (t-commerce). In this work we conducted a usability check in an existing information visualization prototype, in order establish whether or not it follows usability standards and in order to make it more usable to the user.