topauthor: Costa_D* : Human-Computer Interaction Bibliography Search

[1] A4TV: assessing and ameliorating the accessibility of the ascending connected TV platforms Google doctoral consortium / Costa, Daniel Proceedings of the 2015 International Cross-Disciplinary Conference on Web Accessibility (W4A) 2015-05-18 p.37

ACM Digital Library Link

Summary: Connected Digital TV is an advanced broadcasting technology that provides a better experience in terms of picture and sound quality and enables multiple programming choices and interactive capabilities, while extending the reach of multimedia content by enabling access to Internet's multimedia content. Consumers perceive these benefits and are increasingly choosing Connected TV products: set-top boxes and TVs which have the capability to be connected to the Web. User motivation stems from the search for richer, more genuinely interactive experiences, of the type they are familiar with from Web browsing on home computers and Web applications on internet-enabled mobile devices. Given TV's reach, we envision the use of TV based applications by a wide range of the population, including people with different kinds of impairments. Thus, it is paramount to guarantee that everyone can access the same information in this medium. This paper describes the PhD's plan and the expected contributions to address this problem with special focus on visual impaired people.

[2] From One to Many Users and Contexts: A Classifier for Hand and Arm Gestures Multimodal / Touch / Gesture / Costa, David / Duarte, Carlos Proceedings of the 2015 International Conference on Intelligent User Interfaces 2015-03-29 v.1 p.115-120

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Summary: On-body interaction techniques are gaining traction, and opening up new avenues to control interactive systems. At the same time, they reveal potential to increase the accessibility of systems like touch based smartphones and other mobile devices for visually impaired users. However, for this potential to be realised, it is paramount that these techniques can be used in a multitude of contextual settings, and, ideally, do not impose training and calibration procedures. Our approach intends to optimize signal filtering, feature extraction parameters and classifier configurations for each defined gesture. The results show a 98.35% accuracy for the optimized classifier. We proceeded to conduct a validation study (15 participants) in three contexts: seated, standing and walking. Our findings show that, despite the gesture being trained by someone not participating in the study, the average accuracy was 94.67%. We also concluded that, while walking, false positives can impact its usefulness.

[3] On-Body Interaction for Optimized Accessibility Student Consortium / Costa, David Companion Proceedings of the 2015 International Conference on Intelligent User Interfaces 2015-03-29 v.2 p.121-124

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Summary: This thesis addresses the suitability of body interaction techniques, when used by persons with different levels of visual impairment, to improve the accessibility of mobile devices. The research will focus on: understanding how on-body interaction can surpass the current accessibility levels of mobile devices, characterizing the different complexities of skin mapping for different levels of visual impairment, perceiving for what types of input tasks it is best suited, and studying how it can complement other input modalities. Results will include an on-body interaction model, and several prototypes and studies characterizing body interaction.

[4] Hug a tree in Africa Participatory Art / Mendes, Mónica / Ângelo, Pedro / Correia, Nuno / Nisi, Valentina / Nunes, Nuno / Costa, Donovan Proceedings of the 13th Participatory Design Conference. Volume 2: Short Papers, Industry Cases, Workshop Descriptions, Doctoral Consortium Papers, and Keynote Abstracts 2014-10-06 v.2 p.161-163

ACM Digital Library Link

Summary: A healthy and sustainable relationship between humans and the built and surrounding natural environment requires a deep rethinking of concepts and models. In this context the exploration of new forms of expression enabled by emerging technologies plays an important role. Through the Hug a Tree in Africa installation we are addressing artistic, scientific and technological aspects of the challenge of connecting people and places. This will promote a healthier and more sustainable relationship between humans and the natural environment. In this installation an instrumented tree detects and records videos of participants hugging a tree. These hugs are displayed locally as a video collage and are shared with other Hug@tree installations around the world, creating a global shared embrace of nature.

[5] A Comparison of the Accessibility of Web Applications in TV and Desktop Posters / Costa, Daniel / Dias, Ricardo / Duarte, Carlos Proceedings of the 28th BCS International Conference on Human-Computer Interaction 2014-09-12 p.55

ewic.bcs.org/content/ConWebDoc/54245

Summary: Given TVs reach, we envision the use of TV based applications by a wide range of the population, including the elderly and people with different kinds of impairments. Thus, it is paramount to guarantee that everyone can access the same information. In this paper we present a study of the current state of the accessibility of TV applications, analysing their conformance with the WCAG 2.0 guidelines and comparing them to their desktop versions. The results show that, even though there has been less effort in TV accessibility research, TV applications are more conformant than their desktop counterparts.

[6] Welcoming gesture recognition into autism therapy Works-in-progress / Duarte, Carlos / Carriço, Luis / Costa, David / Costa, Daniel / Falcão, André / Tavares, Luís Proceedings of ACM CHI 2014 Conference on Human Factors in Computing Systems 2014-04-26 v.2 p.1267-1272

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Summary: Gesture imitation has recognized benefits as a therapy for children with Autism Spectrum Disorder. Even tough automatic gesture recognition has advanced greatly in the last years, its application in the field of autism therapy has been mostly irrelevant. In this paper we present a solution that: 1) integrates gesture imitation into storytelling therapies; 2) is capable to learn new gestures without an explicit learning stage; 3) provides automatic gesture recognition capable of assisting therapists during interventions, and might support social skills practice at home.

[7] Three web accessibility evaluation perspectives for RIA ARIA / Fernandes, Nádia / Batista, Ana Sofia / Costa, Daniel / Duarte, Carlos / Carriço, Luís Proceedings of the 2013 International Cross-Disciplinary Conference on Web Accessibility (W4A) 2013-05-13 p.12

ACM Digital Library Link

Summary: With the increasing popularity of Rich Internet Applications (RIAs), several challenges arise in the area of web accessibility evaluation. A particular set of challenges emerges from RIAs dynamic nature: original static Web specifications can change dramatically before being presented to the end user; a user triggered event may provide complete new content within the same RIA. Whatever the evaluation alternative, the challenges must be met.
    We focus on automatic evaluation using the current WCAG standards. That enables us to do extensive evaluations in order to grasp the accessibility state of the web eventually pointing new direction for improvement.
    In this paper, we present a comparative study to understand the difference of the accessibility properties of the Web regarding three different evaluation perspectives: 1) before browser processing; 2) after browser processing (dynamic loading); 3) and, also after browser processing, considering the triggering of user interaction events.
    The results clearly show that for a RIA the number of accessibility outcomes varies considerably between those tree perspectives. First of all, this variation shows an increase of the number of assessed elements as well as passes, warnings and errors from perspective 1 to 2, due to dynamically loaded code, and from 2 to 3, due to the new pages reached by the interaction events. This shows that evaluating RIAs without considering its dynamic components provides an erroneous perception of its accessibility. Secondly, the relative growth of the number of fails is bigger than the growth of passes. This signifies that considering pages reached by interaction reveals lower quality for RIAs. Finally, a tendency is shown for the RIAs with higher number of states also exposing differences in accessibility quality.

[8] Web Accessibility in Africa: A Study of Three African Domains Cross-Cultural, Intercultural and Social Issues / Costa, Daniel / Fernandes, Nádia / Neves, Sofia / Duarte, Carlos / Hijón-Neira, Raquel / Carriço, Luís Proceedings of IFIP INTERACT'13: Human-Computer Interaction-1 2013 v.1 p.331-338

Keywords: Web Science; Web accessibility; automated evaluation

Link to Digital Content at Springer

Summary: Being the most used method for dissemination of information, especially for public services, it is of paramount importance that the Web is made accessible as to allow all its users to access the content of its pages.
In this paper, we evaluated 2250 Governmental Web pages from each one of three different African countries (i.e., Angola, Mozambique and South Africa). This report compares the accessibility quality and the level of structural complexity of these African countries government's Web pages. We found that hand coded pages tend to have larger number of HTML elements and also to present higher number of accessibility problems. Finally, it suggests some recommendations to repair the most common problems in these pages.

[9] EDITED BOOK A Multimodal End-2-End Approach to Accessible Computing / Biswas, Pradipta / Duarte, Carlos / Langdon, Patrick / Almeida, Luis / Jung, Christoph 2013 n.11 p.256 Springer London

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== Part I: Design ==
1. What Technology Can and Cannot Offer an Ageing Population: Current Situation and Future Approach (3-22)
	+ Frid, Linnea
	+ García, Alvaro
	+ Laskibar, Iker
	+ Etxaniz, Aitziber
	+ Gonzalez, Mari Feli
2. Developing an Interactive TV for the Elderly and Impaired: An Inclusive Design Strategy (23-48)
	+ Langdon, Pat
3. Designing TV Interaction for the Elderly -- A Case Study of the Design for All Approach (49-69)
	+ Coelho, José
	+ Guerreiro, Tiago
	+ Duarte, Carlos
4. Inclusive User Modeling and Simulation (71-89)
	+ Biswas, Pradipta
	+ Langdon, Pat
== Part II: Development ==
5. Intelligent Interaction in Accessible Applications (93-117)
	+ Bahram, Sina
	+ Chakraborty, Arpan
	+ Ravindran, Srinath
	+ St. Amant, Robert
6. Interaction Techniques for Users with Severe Motor-Impairment (119-134)
	+ Biswas, Pradipta
	+ Joshi, Rohan
	+ Chattopadhyay, Subhagata
	+ Acharya, U. Rajendra
	+ Lim, Teik-Cheng
7. Embodied Virtual Agents as a Means to Foster E-Inclusion of Older People (135-154)
	+ Noy, Dominic
	+ Ribeiro, Pedro
	+ Iurgel, Ido A.
8. Building an Adaptive Multimodal Framework for Resource Constrained Systems (155-173)
	+ Duarte, Carlos
	+ Costa, Daniel
	+ Feiteira, Pedro
	+ Costa, David
== Part III: Maintenance ==
9. Evaluating the Accessibility of Adaptive TV Based Web Applications (177-194)
	+ Fernandes, Nádia
	+ Costa, Daniel
	+ Duarte, Carlos
	+ Carriço, Luís
10. An Interoperable and Inclusive User Modeling Concept for Simulation and Adaptation (195-236)
	+ Biswas, Pradipta
	+ Kaklanis, N.
	+ Mohamad, Y.
	+ Peissner, M.
	+ Langdon, Pat
	+ Tzovaras, D.
	+ Jung, Christoph
11. Standardization of Audiovisual Media Accessibility (237-253)
	+ Looms, Peter Olaf

[10] Accessibility of Dynamic Adaptive Web TV Applications Web Accessibility in Advanced Technologies / Costa, Daniel / Fernandes, Nádia / Duarte, Carlos / Carriço, Luís ICCHP'12: International Conference on Computers Helping People with Special Needs 2012-07-11 v.1 p.343-350

Keywords: Web Accessibility; Web TV applications; Automated Evaluation; Rich Internet Applications

Link to Digital Content at Springer

Summary: In the last years, TVs have become platforms providing content and entertainment services, such as video on demand, interactive advertising or social networking. Often, these services are Web based applications that run of connected TVs or set-top boxes. Given TV's wide reach, it is paramount TV applications are designed so that information can be perceived by everyone, i.e. should be accessible. These applications increasingly present dynamic aspects, which have been rendering traditional Web evaluation approaches obsolete. Additionally, TV based interaction has specificities that Web based evaluation is unable to cope with. In this paper, we present an automated accessibility evaluation framework to address these challenges. It is based on WCAG 2.0 and Digital TV guidelines. It supports evaluation of the code after browser processing and scanning the whole set of application states. It is capable of evaluating user interface adaptation based on selected user profiles. The paper also presents the evaluation results of three TV based applications according to the proposed framework, which allow a comparison of results of pre and post browser processing as well as pre and post adaptation.

[11] Evaluating the accessibility of rich internet applications Accessible web 2.0 / Fernandes, Nádia / Costa, Daniel / Neves, Sergio / Duarte, Carlos / Carriço, Luís Proceedings of the 2012 International Cross-Disciplinary Conference on Web Accessibility (W4A) 2012-04-16 p.13

ACM Digital Library Link

Summary: The Web has been growing in size and complexity and is used for the most diverse activities in our every day life, becoming almost indispensable. Besides, Web applications are becoming more popular, and consequently used by a wide range of people. Thus, it is important to evaluate the accessibility of the new Rich Internet Applications (RIA) to guarantee that everyone can access the information.
Currently, there are some tools to evaluate the accessibility of classical Web pages, which use WCAG guidelines. However, Web applications impose different challenges, so it is mandatory to find a way to automatically obtain the dynamically introduced HTML code, in order to evaluate what users really experience.
This paper details a new process of accessibility evaluation of Web applications, which evaluates the content by triggering possible events that partially change the Web page. It also presents an experimental study with several Web applications, demonstrating the potential of this framework in evaluating Web applications.

[12] Building Bridges Between Elderly and TV Application Developers Usability and Universal Accessibility II / Coelho, José / Duarte, Carlos / Feiteira, Pedro / Costa, Daniel / Costa, David Proceedings of the 2012 International Conference on Advances in Computer-Human Interactions 2012-01-30 p.53-59

Keywords: multimodal, adaptation, developers, elderly

www.thinkmind.org/index.php

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Summary: The development of new digital TV systems and the design practices adopted in the development of new TV based applications often isolate elderly and disabled users. By considering them as users with special needs and not taking their problems into account during the design phase of an application, developers are creating new accessibility problems or just keeping bad old habits. In this paper, we describe a novel adaptive accessibility approach on how to develop accessible TV applications, by making use of multimodal interaction techniques and without requiring too much effort from the developers. By putting user-centered design techniques in practice, and supporting the use of multimodal interfaces with several input and output devices, we confront users, developers and manufactures with new interaction and design paradigms. From their evaluation, new techniques are created capable of helping in the development of accessible TV applications.

[13] Eliciting Interaction Requirements for Adaptive Multimodal TV Based Applications Design for All Methods and Tools / Duarte, Carlos / Coelho, José / Feiteira, Pedro / Costa, David / Costa, Daniel UAHCI 2011: 6th International Conference on Universal Access in Human-Computer Interaction, Part I: Design for All and eInclusion 2011-07-09 v.1 p.42-50

Keywords: Multimodal interaction; Adaptation; User trials

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Summary: The design of multimodal adaptive applications should be strongly supported by a user centred methodology. This paper presents an analysis of the results of user trials conducted with a prototype of a multimodal system in order to elicit requirements for multimodal interaction and adaptation mechanisms that are being developed in order to design a framework to support the development of accessible ICT applications. Factors related to visual and audio perception, and motor skills are considered, as well as multimodal integration patterns.

[14] Adapting Multimodal Fission to User's Abilities Multimodality, Adaptation and Personalisation / Costa, David / Duarte, Carlos UAHCI 2011: 6th International Conference on Universal Access in Human-Computer Interaction, Part I: Design for All and eInclusion 2011-07-09 v.1 p.347-356

Link to Digital Content at Springer

Summary: New ways of communication are now possible thanks to adaptive multimodal systems, enabling the improvement in accessibility of ICT applications to all users. We are developing a project which combines TV with a multimodal system in order to overcome accessibility and usability problems by impaired users. This paper is focused on the fission of outputs, and how the presentations of applications running on GUIDE's environment are adapted to the user's capabilities.

[15] Self-adapting TV Based Applications Multimodality, Adaptation and Personalisation / Costa, Daniel / Duarte, Carlos UAHCI 2011: 6th International Conference on Universal Access in Human-Computer Interaction, Part I: Design for All and eInclusion 2011-07-09 v.1 p.357-364

Keywords: Accessibility; Adaptive Multimodal Systems; Dialogue Manager

Link to Digital Content at Springer

Summary: The lack of accessibility of ICT applications affects mainly the disabled and/or elderly people, who have a high risk of social exclusion. Using the advantages of adaptive multimodal systems and a well-accepted device like the TV, those difficulties can be surmounted and social exclusion can be stopped. GUIDE intends to simplify the interaction and at the same time not limit the users able to use it, providing multimodal interaction. Also, applications running on GUIDE environment will be able to adapt, on an automated way, to the user's needs and characteristics.

[16] Generating maps of web pages using cellular automata Browsers and UI, web engineering, hypermedia & multimedia, security, and accessibility / Azzag, Hanene / Ratsimba, David / Costa, David Da / Venturini, Gilles / Guinot, Christiane Proceedings of the 2006 International Conference on the World Wide Web 2006-05-23 p.935-936

Keywords: cellular automata, unsupervised clustering, visualization, web pages

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Summary: The aim of web pages visualization is to present in a very informative and interactive way a set of web documents to the user in order to let him or her navigate through these documents. In the web context, this may correspond to several user's tasks: displaying the results of a search engine, or visualizing a graph of pages such as a hypertext or a surf map. In addition to web pages visualization, web pages clustering also greatly improves the amount of information presented to the user by highlighting the similarities between the documents [6]. In this paper we explore the use of a cellular automata (CA) to generate such maps of web pages.

[17] Visualisation interactive de données avec des points d'intérêt / Costa, David Da / Venturini, Gilles Proceedings of the 2006 Conference of the Association Francophone d'Interaction Homme-Machine 2006-04-18 p.219-222

Languages: French

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Summary: Users' needs towards the environments supporting their activities are emerging and continuously evolve. A solution is to give the means to the users to adapt their environment, by integrating the tools they need. If technical solutions exist, current dynamic integration approaches still face a semantic problem: in order to finely integrate a tool in an activity, one must indeed well understand what will be its place in this activity. In order to facilitate this understanding and this dynamic integration, we propose a new approach of conception and integration, based on previous work on task modelling.

[18] Publishing 30 Years of the Legislation of Brazil's São Paulo State in CD-ROM and Internet Cases 1 / Leme, Paulo / Costa, Dilson da / Baccarelli, Ricardo / Barbosa, Maurício / Bolanho, Andréa / Reis, Ana / Bicudo, Rose / Barbosa, Eduardo F. / Nunes, Márcio / Filho, Innocêncio Pereira / Plonski, Guilherme / Kobayashi, Sérgio ECDL 2000: Proceedings of the European Conference on Digital Libraries 2000-09-18 p.449-451

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Summary: About 60,000 legal acts covering the last 30 years of the São Paulo State legislation are published in CD-ROM and the Internet. The effective search engine implemented yields to a swift and intuitive system using hypertext feature for easy navigation through related legal acts. It is already reflecting a significant improvement in administrative and legal procedures in government offices, legislative and judiciary departments, municipal administrations as well as private lawyer offices, corporations, universities, and members of the community.