Accuracy and reliability of the RGB-D camera for measuring walking speed on a treadmill

•PCBS measures a person's walking speed on a treadmill from feet detection.•PCBS is accurate and reliable at speeds ranging from 0.42 to 1.53ms−1.•PCBS is sufficiently accurate and reliable to be used as a controller in an exergame context. RGB-D cameras (Red Green Blue+Depth) are widely employ...

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Bibliographic Details
Published in:Gait & posture Vol. 48; no. NA; pp. 113 - 119
Main Authors: Fosty, B., Ben-Sadoun, G., Sacco, G., König, A., Manera, V., Foulon, P., Brisswalter, J., Robert, P.H., Bremond, F.
Format: Journal Article
Language:English
Published: England Elsevier B.V 01.07.2016
Elsevier
Subjects:
Adult
Computer Science
Computer Science and Game Theory
Data Structures and Algorithms
Exercise Test
Female
Humans
Male
Orthopedics
Physical exercise
Reproducibility of Results
RGB-D camera
Software
Treadmill
Validity
Video Recording - instrumentation
Walk
Walking Speed
Walk
Physical exercise
Validity
Treadmill
RGB-D camera
ISSN:0966-6362, 1879-2219, 1879-2219
Online Access:Get full text
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Summary:•PCBS measures a person's walking speed on a treadmill from feet detection.•PCBS is accurate and reliable at speeds ranging from 0.42 to 1.53ms−1.•PCBS is sufficiently accurate and reliable to be used as a controller in an exergame context. RGB-D cameras (Red Green Blue+Depth) are widely employed in exergames designed to physically stimulate elderly people. Nevertheless, the intensity of the physical activity reached with the existing solutions is rarely sufficient to obtain a real impact on the physical fitness and thus on the health status of this population. In this context, a Point Cloud Based System (PCBS) has been developed to interface ordinary motorized treadmills with exergames through a simple RGB-D camera, to induce players to perform physical activities at higher intensities. The goal of this study was to assess the accuracy and reliability of PCBS to measure the walking speed of a subject on a standard motorized treadmill based on the image streams of an RGB-D camera. 36 participants performed three 10min walking exercises, divided in 5 blocks of 2min at the following constant ordered speeds: 0.42, 0.69, 0.97, 1.25 and 1.53ms−1. The measured walking speeds are compared to those obtained through a Marker Based Control System (MBCS). Results showed a high system accuracy (bias: 0.013±0.015ms−1), a good reliability (ICC=0.63–0.91) and a low variability (SEM=1–5%; MD=2.7–14%). Accuracy and reliability of PCBS are consistent with those obtained in similar existing systems measuring gait parameters. Within the context of the development of exergames, PCBS may be combined with exergames to perform physical activities at sufficiently high intensities in the elderly population, in order to improve their physical health and possibly prevent/delay cognitive impairment.
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ISSN:0966-6362
1879-2219
1879-2219
DOI:10.1016/j.gaitpost.2016.04.011