N. Edelweiss | Universidade Federal do Rio Grande do Sul (original) (raw)

Papers by N. Edelweiss

CLEI Electronic Journal, 2012

This special issue contains papers from CLEI 2011 which took place in October 2011 in Quito, Ecua... more This special issue contains papers from CLEI 2011 which took place in October 2011 in Quito, Ecuador.

Abstract—In the last few years, the internet use is growing and web pages are being populated by ... more Abstract—In the last few years, the internet use is growing and web pages are being populated by multimedia objects. At the same time, traffic over the internet is growing and, consequently, the importance of data compression. This paper presents formal definitions ...

Proceedings of the Working Conference on Advanced Visual Interfaces - AVI '02, 2002

Evaluating user interfaces is usually accomplished to detect design problems in layout and intera... more Evaluating user interfaces is usually accomplished to detect design problems in layout and interaction. One possible way to evaluate image quality in computer graphics is visual inspection by experts. Information visualization techniques are usually presented showing their use in experimental situations, employing some kind of analysis. Nevertheless, few works have specifically addressed the evaluation of such techniques. This work reports our results towards the definition of criteria for evaluating information visualization techniques, addressing the evaluation of visual representation and interaction mechanisms as a first step.

Several information visualization techniques have been developed in the last few years due to the... more Several information visualization techniques have been developed in the last few years due to the need of representing and analyzing the huge amount of data generated by several applications or made available through the World Wide Web. These techniques are usually interactive and provided as part of a graphical user interface. Information visualization techniques are usually reported showing their use in experimental situations, employing some kind of analysis. Nevertheless, few studies have specifically addressed the evaluation of such techniques. This paper reports our results towards the definition of criteria for evaluating information visualization techniques, addressing evaluation of visual representations and interaction mechanisms. Resumo. Várias técnicas de visualização de informações foram desenvolvidas nos últimos anos devido a necessidade de representar e analisar a grande quantidade de informações geradas por diversas aplicações ou disponíveis através da World Wide Web. Estas técnicas são geralmente interativas e fornecidas como parte de uma interface gráfica. Técnicas de visualização de informações são normalmente relatadas analisando seu uso em situações experimentais em geral limitadas. Entretanto, poucos estudos tratam efetivamente da avaliação dessas técnicas. O presente trabalho apresenta resultados na direção da definição de critérios para avaliar técnicas de visualização, em relação a representações visuais e mecanismos de interação.

To establish a relation between the user preferences and accuracy while using a VR or MR system a... more To establish a relation between the user preferences and accuracy while using a VR or MR system and the set of components (technical, functional and perceptual) used in the system conception is yet a challenge. In this work we study the user reaction in relation to image guided surgery applications using different kind of visualization and guidance. Our goal is to identify practical basis that explains how mixed reality interfaces might provide support and augmentation for interactive applications. To accomplish that, we propose a model that allows the identification of the contribution of each independent variable in the final user interaction. The contribution rates were identified by applying user tests.

2013 XV Symposium on Virtual and Augmented Reality, 2013

In recent years, smartphones experienced a fast technological growth, approaching its computation... more In recent years, smartphones experienced a fast technological growth, approaching its computational capacity to personal computers. In addition to that, new hardware and sensors are being incorporated into these devices. The smartphone's embedded sensors are a low cost solution that allows interactions between humans, computers and the environment. Examples include applications designed to identify the user's location by GPS receiver, games that use accelerometers and/or gyroscope, Wi-Fi and Bluetooth antennas that exchange information between users, microphones that perceive user's gestural movements, and so on. This paper presents a study of the various smartphones sensors, detailing their operation and identifying their main features, advantages, drawbacks, and potential of use for indoor location. We analyzed smartphones sensitive to sound, Wi-Fi, magnetic field, 3-dimensional linear acceleration and angular velocity. This study presented -as the ideal solution -a fusion of sensors to complement individual skills and to improve the information accuracy regarding the device's rotation and translation.

CLEI Electronic Journal, 2012

This special issue contains papers from CLEI 2011 which took place in October 2011 in Quito, Ecua... more This special issue contains papers from CLEI 2011 which took place in October 2011 in Quito, Ecuador.

Abstract—In the last few years, the internet use is growing and web pages are being populated by ... more Abstract—In the last few years, the internet use is growing and web pages are being populated by multimedia objects. At the same time, traffic over the internet is growing and, consequently, the importance of data compression. This paper presents formal definitions ...

Proceedings of the Working Conference on Advanced Visual Interfaces - AVI '02, 2002

Evaluating user interfaces is usually accomplished to detect design problems in layout and intera... more Evaluating user interfaces is usually accomplished to detect design problems in layout and interaction. One possible way to evaluate image quality in computer graphics is visual inspection by experts. Information visualization techniques are usually presented showing their use in experimental situations, employing some kind of analysis. Nevertheless, few works have specifically addressed the evaluation of such techniques. This work reports our results towards the definition of criteria for evaluating information visualization techniques, addressing the evaluation of visual representation and interaction mechanisms as a first step.

Several information visualization techniques have been developed in the last few years due to the... more Several information visualization techniques have been developed in the last few years due to the need of representing and analyzing the huge amount of data generated by several applications or made available through the World Wide Web. These techniques are usually interactive and provided as part of a graphical user interface. Information visualization techniques are usually reported showing their use in experimental situations, employing some kind of analysis. Nevertheless, few studies have specifically addressed the evaluation of such techniques. This paper reports our results towards the definition of criteria for evaluating information visualization techniques, addressing evaluation of visual representations and interaction mechanisms. Resumo. Várias técnicas de visualização de informações foram desenvolvidas nos últimos anos devido a necessidade de representar e analisar a grande quantidade de informações geradas por diversas aplicações ou disponíveis através da World Wide Web. Estas técnicas são geralmente interativas e fornecidas como parte de uma interface gráfica. Técnicas de visualização de informações são normalmente relatadas analisando seu uso em situações experimentais em geral limitadas. Entretanto, poucos estudos tratam efetivamente da avaliação dessas técnicas. O presente trabalho apresenta resultados na direção da definição de critérios para avaliar técnicas de visualização, em relação a representações visuais e mecanismos de interação.

To establish a relation between the user preferences and accuracy while using a VR or MR system a... more To establish a relation between the user preferences and accuracy while using a VR or MR system and the set of components (technical, functional and perceptual) used in the system conception is yet a challenge. In this work we study the user reaction in relation to image guided surgery applications using different kind of visualization and guidance. Our goal is to identify practical basis that explains how mixed reality interfaces might provide support and augmentation for interactive applications. To accomplish that, we propose a model that allows the identification of the contribution of each independent variable in the final user interaction. The contribution rates were identified by applying user tests.

2013 XV Symposium on Virtual and Augmented Reality, 2013

In recent years, smartphones experienced a fast technological growth, approaching its computation... more In recent years, smartphones experienced a fast technological growth, approaching its computational capacity to personal computers. In addition to that, new hardware and sensors are being incorporated into these devices. The smartphone's embedded sensors are a low cost solution that allows interactions between humans, computers and the environment. Examples include applications designed to identify the user's location by GPS receiver, games that use accelerometers and/or gyroscope, Wi-Fi and Bluetooth antennas that exchange information between users, microphones that perceive user's gestural movements, and so on. This paper presents a study of the various smartphones sensors, detailing their operation and identifying their main features, advantages, drawbacks, and potential of use for indoor location. We analyzed smartphones sensitive to sound, Wi-Fi, magnetic field, 3-dimensional linear acceleration and angular velocity. This study presented -as the ideal solution -a fusion of sensors to complement individual skills and to improve the information accuracy regarding the device's rotation and translation.