Computer Vision-Based Adaptive Semi-Autonomous Control of an Upper Limb Exoskeleton for Individuals with Tetraplegia

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Computer Vision-Based Adaptive Semi-Autonomous Control of an Upper Limb Exoskeleton for Individuals with Tetraplegia

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Bengtson, Stefan Hein / Thøgersen, Mikkel / Mohammadi, Mostafa / Kobbelgaard, Frederik Victor / Gull, Muhammad Ahsan / Struijk, Lotte N. S. Andreasen / Bak, Thomas / Moeslund, Thomas B.

Abstract

We propose the use of computer vision for adaptive semi-autonomous control of an upper limb exoskeleton for assisting users with severe tetraplegia to increase independence and quality of life. A tongue-based interface was used together with the semi-autonomous control such that individuals with complete tetraplegia were able to use it despite being paralyzed from the neck down. The semi-autonomous control uses computer vision to detect nearby objects and estimate how to grasp them to assist the user in controlling the exoskeleton. Three control schemes were tested: non-autonomous (i.e., manual control using the tongue) control, semi-autonomous control with a fixed level of autonomy, and a semi-autonomous control with a confidence-based adaptive level of autonomy. Studies on experimental participants with and without tetraplegia were carried out. The control schemes were evaluated both in terms of their performance, such as the time and number of commands needed to complete a given task, as well as ratings from the users. The studies showed a clear and significant improvement in both performance and user ratings when using either of the semi-autonomous control schemes. The adaptive semi-autonomous control outperformed the fixed version in some scenarios, namely, in the more complex tasks and with users with more training in using the system.

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Dokumentinformationen

Titel :

Computer Vision-Based Adaptive Semi-Autonomous Control of an Upper Limb Exoskeleton for Individuals with Tetraplegia

Beteiligte:

Bengtson, Stefan Hein (Autor:in) / Thøgersen, Mikkel (Autor:in) / Mohammadi, Mostafa (Autor:in) / Kobbelgaard, Frederik Victor (Autor:in) / Gull, Muhammad Ahsan (Autor:in) / Struijk, Lotte N. S. Andreasen (Autor:in) / Bak, Thomas (Autor:in) / Moeslund, Thomas B. (Autor:in)

Erscheinungsdatum :

2022-04-26

Anmerkungen:

Bengtson , S H , Thøgersen , M , Mohammadi , M , Kobbelgaard , F V , Gull , M A , Struijk , L N S A , Bak , T & Moeslund , T B 2022 , ' Computer Vision-Based Adaptive Semi-Autonomous Control of an Upper Limb Exoskeleton for Individuals with Tetraplegia ' , Applied Sciences , vol. 12 , no. 9 , 4374 . https://doi.org/10.3390/app12094374

DOI :

https://doi.org/10.3390/app12094374

Medientyp :

Aufsatz (Zeitschrift)

Format :

Elektronische Ressource

Sprache :

Englisch

Schlagwörter :

assistive robotics , computer vision , intent prediction , semi-autonomous control , shared control , spinal cord injury , tetraplegia , upper limb exoskeleton

Klassifikation :

DDC: