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Simplification of visual rendering in Simulated Prosthetic Vision facilitates navigation

Vergnieux, Victor and Macé, Marc and Jouffrais, Christophe Simplification of visual rendering in Simulated Prosthetic Vision facilitates navigation. (2017) Artificial Organs, 41 (9). 852-861. ISSN 0160-564X

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Official URL: http://dx.doi.org/10.1111/aor.12868

Abstract

Visual neuroprostheses are yet limited and Simulated Prosthetic Vision (SPV) is used to evaluate potential and forthcoming functionality of these implants. SPV has been used to evaluate the minimum requirement on visual neuroprostheses characteristics to restore various functions such as reading, objects and face recognition, objects grasping, etc. Some of these studies focused on obstacle avoidance but only a few investigated orientation or navigation abilities with prosthetic vision. The resolution of current arrays of electrodes is not sufficient to allow navigation tasks without additional processing of the visual input. In this study, we simulated a low resolution array (15x18 electrodes, similar to a forthcoming generation of arrays) and evaluated the navigation abilities restored when visual information was processed with various computer vision algorithms to enhance the visual rendering. Three main visual rendering strategies were compared to a control rendering in a wayfinding task within an unknown environment. The control rendering corresponded to a resizing of the original image onto the electrode array size, according to the average brightness of the pixels. In the first rendering strategy, vision distance was limited to three, six or nine meters respectively. In the second strategy, the rendering was not based on the brightness of the image pixels, but on the distance between the user and the elements in the field of view. In the last rendering strategy, only the edges of the environments were displayed, similar to a wireframe rendering. All the tested renderings, except the 3 m limitation of the field of view, improved navigation performance and decreased cognitive load. Interestingly, the distance-based and wireframe renderings also improved the cognitive mapping of the unknown environment. These results show that low resolution implants are usable for wayfinding if specific computer vision algorithms are used to select and display appropriate information regarding the environment.

Item Type:Article
Additional Information:Thanks to Wiley editor. The original PDF can be found at Artificial Organs (ISSN 0160-564X) website : http://onlinelibrary.wiley.com/doi/10.1111/aor.12868/epdf
HAL Id:hal-01692744
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Université de Toulouse > Université Toulouse - Jean Jaurès - UT2J (FRANCE)
Université de Toulouse > Université Toulouse 1 Capitole - UT1 (FRANCE)
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Deposited By: IRIT IRIT
Deposited On:22 Jan 2018 15:37

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