TY - CHAP A1 - Dotenco, Sergiu A1 - Götzelmann, Timo A1 - Gallwitz, Florian T1 - Smartphone Input Using an Integrated Projector and a Monocular Camera T2 - Lecture Notes in Computer Science N2 - Touch input on modern smartphones can be tedious, especially if the touchscreen is small. Smartphones with integrated projectors can be used to overcome this limitation by projecting the screen contents onto a surface, allowing the user to interact with the projection by means of simple hand gestures. In this work, we propose a novel approach for projector smartphones that allows the user to remotely interact with the smartphone screen via its projection. We detect user's interaction using the built-in camera, and forward detected hand gestures as touch input events to the operating system. In order to avoid costly computations, we additionally use built-in motion sensors. We verify the proposed method using an implementation for the consumer smartphone Samsung Galaxy Beam equipped with a deflection mirror. KW - Mobile computing KW - Touch input KW - Projector KW - Smartphone KW - Limited input space KW - App KW - Programmierung KW - Projektionsapparat Y1 - 2014 UR - http://link.springer.com/chapter/10.1007/978-3-319-07227-2_13 SN - 978-3-319-07226-5 VL - Volume 8512 PB - Springer ER - TY - CHAP A1 - Götzelmann, Timo T1 - SmartTactMaps: A Smartphone-Based Approach to Support Blind Persons in Exploring Tactile Maps T2 - Proc. 8th ACM International Conference on PErvasive Technologies Related to Assistive Environments N2 - Despite increasing digitalization of our society many blind persons still have very limited access to predominantly pictorial information such as maps. In this paper we introduce a novel approach to improve the accessibility of maps for blind users by utilizing the abilities of standard smartphones. A major issue of tactile maps is the limited discriminability of the humans' tactile sense. Textual annotation of maps is crucial, but adds much complexity to tactile maps. Additionally, only few Braille labels can be accommodated to maintain legibility. In our approach we link smartphones with adapted tactile maps which transforms the physical maps into interactive surfaces using both the tactile and the auditory modality. We integrate machine readable metadata into these maps which can be recognized by the smartphones' camera to immediately obtain detailed map descriptions from a free global database. During tactile exploration of the map, blind users can request auditory explanations by interacting with the mobile application. An experimental application and a user study demonstrate the feasibility of our approach. Y1 - 2015 UR - https://doi.org/10.1145/2769493.2769497 SN - 978-1-4503-3452-5 VL - 2015 PB - ACM CY - New York, NY, USA ER - TY - CHAP A1 - Götzelmann, Timo A1 - Althaus, Christoph T1 - TouchSurfaceModels: Capacitive Sensing Objects through 3D Printers T2 - Proc. 9th ACM International Conference on PErvasive Technologies Related to Assistive Environments N2 - Nowadays, 3D models can be downloaded from the internet and increasingly be printed by low cost 3D printers. In the future, blind people could benefit from this tendency. Unfortunately, many of these models are rather complex and not appropriate for the purely tactile exploration. To obtain quantitative data about how 3D printable models for blind people should be constructed, the tactile exploration can be recorded by video. However, the analysis of these videos is quite time consuming and expensive. Additionally, inaccuracies and masking effects may impede the use of this technique. In this paper we introduce a novel approach to automatically equip existing 3D models with a mesh of conductive wires which enable a touch sensitive surface for the printed 3D objects. These touch sensing 3D models can be printed in one turn by off-the-shelf 3D printers and used as an alternative to video recording. It allows exact registration of when and where the 3D object has been touched. In our multi-touch solution, particular attention has been paid to limit the number of necessary wires between 3D object and sensing electronics. Finally, our approach is evaluated by a feasibility study. Y1 - 2016 UR - https://doi.org/10.1145/2910674.2910690 SN - 978-1-4503-4337-4 VL - 2016 PB - ACM CY - New York, NY, USA ER - TY - CHAP A1 - Götzelmann, Timo A1 - Pavkovic, Aleksander T1 - Towards Automatically Generated Tactile Detail Maps by 3D Printers for Blind Persons BT - 14th International Conference, ICCHP 2014, Paris, France, July 9-11, 2014, Proceedings, Part II T2 - Computers Helping People with Special Needs N2 - This paper introduces an approach for the (semi)automatic generation of worldwide available, detailed tactile maps including buildings and blind-specific features based on recognized illustrators’ guidelines and standards. These guidelines for tactile maps are investigated in order to define a formal rule set and to automatically filter map data accordingly. Using the rule set, our approach automatically abstracts map data in order to generate a 2.1D tactile model providing multiple height levels (layers) which can be printed by usual consumer 3D printers. Based on the popular OpenStreetMap map data, our automated approach allows to generate arbitrary detail maps blind persons individually interested in, without the need for manual adaption of the tactile map. Thus, this approach contributes to the goal to increase the autonomy of blind persons. KW - Tactile Maps KW - Accessibility KW - Haptic KW - 3D printer KW - 3D-Drucker KW - Blindenkarte Y1 - 2014 SN - 978-3-319-08599-9 U6 - https://doi.org/10.1007/978-3-319-08599-9_1 PB - Springer ER - TY - JOUR A1 - Götzelmann, Timo T1 - Visually Augmented Audio-Tactile Graphics for Visually Impaired People JF - ACM Transactions on Accessible Computing (TACCESS) N2 - Tactile graphics play an essential role in knowledge transfer for blind people. The tactile exploration of these graphics is often challenging because of the cognitive load caused by physiological constraints and their complexity. The coupling of physical tactile graphics with electronic devices offers to support the tactile exploration by auditory feedback. Often, these systems have strict constraints regarding their mobility or the process of coupling both components. Additionally, visually impaired people cannot appropriately benefit from their residual vision. This article presents a concept for 3D printed tactile graphics, which offers to use audio-tactile graphics with usual smartphones or tablet-computers. By using capacitive markers, the coupling of the tactile graphics with the mobile device is simplified. These tactile graphics integrating these markers can be printed in one turn by off-the-shelf 3D printers without any post-processing and allows us to use multiple elevation levels for graphical elements. Based on the developed generic concept on visually augmented audio-tactile graphics, we presented a case study for maps. A prototypical implementation was tested by a user study with visually impaired people. All the participants were able to interact with the 3D printed tactile maps using a standard tablet computer. To study the effect of visual augmentation of graphical elements, we conducted another comprehensive user study. We tested multiple types of graphics and obtained evidence that visual augmentation may offer clear advantages for the exploration of tactile graphics. Even participants with a minor residual vision could solve the tasks with visual augmentation more quickly and accurately. Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:92-opus4-5571 VL - 2018 IS - Volume 11, Issue 2, Article No. 8 PB - ACM ER -