An Investigation of Figure Recognition with Electrostatic Tactile Display

Tomita, Hirobumi; Agatsuma, Shotaro; Wang, Ruiyun; Takahashi, Shin; Saga, Satoshi; Kajimoto, Hiroyuki

doi:10.1007/978-3-030-23563-5_29

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…An alternative approach used by the researchers to render tactile graphics on a touch surface is electrovibration (Bau et al, 2010). Researchers have utilized electrovibration displays to render 2D tactile graphics and 3D geometrical shapes in the form of height maps (Israr et al, 2012;Kim et al, 2013;Mullenbach et al, 2014;Osgouei et al, 2016Osgouei et al, , 2017Tomita et al, 2019;Klatzky et al, 2019). For example, Lim et al (2019a) prototyped a mobile application called TouchPhoto using electrovibration technology, that helps visually impaired users to not only take photographs, but also perceive the main landmarks of the person's face by touch.…”

Section: Tactile Graphicsmentioning

confidence: 99%

Exploration Strategies for Tactile Graphics Displayed by Electrovibration on a Touchscreen

Sadia,

Sadic,

Ayyildiz

et al. 2021

Preprint

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Advancements in surface haptics technology have given rise to the development of interactive applications displaying tactile content on touch surfaces such as images, signs, diagrams, plots, charts, graphs, maps, networks, and tables. In those applications, users manually explore the touch surface to interact with the tactile data using some intuitive strategies. The user's exploration strategy, tactile data's complexity, and tactile rendering method all affect the user's haptic perception, which plays a critical role in design and prototyping of those applications. In this study, we conducted experiments with human participants to investigate the recognition rate and time of five tactile shapes (i.e., triangle, square, pentagon, hexagon, and octagon) rendered by electrovibration on a touchscreen using three different methods and displayed in prototypical orientation and non-prototypical orientations (i.e., 15 degrees CW and CCW to the prototypical orientation). The results showed that the correct recognition rate of the shapes was higher when the haptically active area (area where electrovibration was on) was larger. However, as the number of edges was increased, the recognition time increased and the recognition rate dropped significantly, arriving to a value slightly higher than the chance rate of 20% for non-prototypical octagon. Moreover, the recognition time for inside rendering condition was significantly shorter in comparison with edge and outside rendering conditions and edge rendering condition led to the longest recognition time. We also recorded the participants' finger movements on the touchscreen to examine their haptic exploration strategies. Based on our temporal analysis, we classified six exploration strategies adopted by participants to identify the shapes, which were different for the prototypical and non-prototypical shapes. Moreover, our spatial analysis revealed that the participants first used

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Section: Tactile Graphicsmentioning

confidence: 99%

Exploration Strategies for Tactile Graphics Displayed by Electrovibration on a Touchscreen

Sadia,

Sadic,

Ayyildiz

et al. 2021

Preprint

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“…Refreshable tactile displays/surfaces [1][2][3][4][5][6] have been proposed as alternatives, which allow for quick, dynamic access to electronic/virtual tactile diagram representations. At one end of the spectrum are tactile pin displays made from a large matrix of pins; however, these displays are very expensive despite covering much smaller areas compared to typical paper tactile diagrams and having limited spatial resolution (cost is an important consideration as most BVIs live below the poverty line).…”

Section: Introductionmentioning

confidence: 99%

Design of a “Cobot Tactile Display” for Accessing Virtual Diagrams by Blind and Visually Impaired Users

Gill

Pawluk

2022

Sensors

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Access to graphical information plays a very significant role in today’s world. Access to this information can be particularly limiting for individuals who are blind or visually impaired (BVIs). In this work, we present the design of a low-cost, mobile tactile display that also provides robotic assistance/guidance using haptic virtual fixtures in a shared control paradigm to aid in tactile diagram exploration. This work is part of a larger project intended to improve the ability of BVI users to explore tactile graphics on refreshable displays (particularly exploration time and cognitive load) through the use of robotic assistance/guidance. The particular focus of this paper is to share information related to the design and development of an affordable and compact device that may serve as a solution towards this overall goal. The proposed system uses a small omni-wheeled robot base to allow for smooth and unlimited movements in the 2D plane. Sufficient position and orientation accuracy is obtained by using a low-cost dead reckoning approach that combines data from an optical mouse sensor and inertial measurement unit. A low-cost force-sensing system and an admittance control model are used to allow shared control between the Cobot and the user, with the addition of guidance/virtual fixtures to aid in diagram exploration. Preliminary semi-structured interviews, with four blind or visually impaired participants who were allowed to use the Cobot, found that the system was easy to use and potentially useful for exploring virtual diagrams tactually.

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