{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,7]],"date-time":"2026-04-07T19:11:07Z","timestamp":1775589067513,"version":"3.50.1"},"reference-count":66,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,4,17]],"date-time":"2021-04-17T00:00:00Z","timestamp":1618617600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Human body measurement data related to walking can characterize functional movement and thereby become an important tool for health assessment. Single-camera-captured two-dimensional (2D) image sequences of marker-less walking individuals might be a simple approach for estimating human body measurement data which could be used in walking speed-related health assessment. Conventional body measurement data of 2D images are dependent on body-worn garments (used as segmental markers) and are susceptible to changes in the distance between the participant and camera in indoor and outdoor settings. In this study, we propose five ratio-based body measurement data that can be extracted from 2D images and can be used to classify three walking speeds (i.e., slow, normal, and fast) using a deep learning-based bidirectional long short-term memory classification model. The results showed that average classification accuracies of 88.08% and 79.18% could be achieved in indoor and outdoor environments, respectively. Additionally, the proposed ratio-based body measurement data are independent of body-worn garments and not susceptible to changes in the distance between the walking individual and camera. As a simple but efficient technique, the proposed walking speed classification has great potential to be employed in clinics and aged care homes.<\/jats:p>","DOI":"10.3390\/s21082836","type":"journal-article","created":{"date-parts":[[2021,4,19]],"date-time":"2021-04-19T21:59:49Z","timestamp":1618869589000},"page":"2836","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Using a Deep Learning Method and Data from Two-Dimensional (2D) Marker-Less Video-Based Images for Walking Speed Classification"],"prefix":"10.3390","volume":"21","author":[{"given":"Tasriva","family":"Sikandar","sequence":"first","affiliation":[{"name":"Faculty of Electrical and Electronics Engineering, Universiti Malaysia Pahang, Pekan 26600, Malaysia"}]},{"given":"Mohammad F.","family":"Rabbi","sequence":"additional","affiliation":[{"name":"School of Allied Health Sciences, Griffith University, Gold Coast, QLD 4222, Australia"}]},{"given":"Kamarul H.","family":"Ghazali","sequence":"additional","affiliation":[{"name":"Faculty of Electrical and Electronics Engineering, Universiti Malaysia Pahang, Pekan 26600, Malaysia"}]},{"given":"Omar","family":"Altwijri","sequence":"additional","affiliation":[{"name":"Biomedical Technology Department, College of Applied Medical Sciences, King Saud University, Riyadh 11451, Saudi Arabia"}]},{"given":"Mahdi","family":"Alqahtani","sequence":"additional","affiliation":[{"name":"Biomedical Technology Department, College of Applied Medical Sciences, King Saud University, Riyadh 11451, Saudi Arabia"}]},{"given":"Mohammed","family":"Almijalli","sequence":"additional","affiliation":[{"name":"Biomedical Technology Department, College of Applied Medical Sciences, King Saud University, Riyadh 11451, Saudi Arabia"}]},{"given":"Saleh","family":"Altayyar","sequence":"additional","affiliation":[{"name":"Biomedical Technology Department, College of Applied Medical Sciences, King Saud University, Riyadh 11451, Saudi Arabia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0497-7356","authenticated-orcid":false,"given":"Nizam U.","family":"Ahamed","sequence":"additional","affiliation":[{"name":"Neuromuscular Research Laboratory\/Warrior Human Performance Research Center, Department of Sports Medicine and Nutrition, University of Pittsburgh, Pittsburgh, PA 15203, USA"}]}],"member":"1968","published-online":{"date-parts":[[2021,4,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1038\/s41598-019-38748-8","article-title":"Explaining the Unique Nature of Individual Gait Patterns with Deep Learning","volume":"9","author":"Horst","year":"2019","journal-title":"Sci. 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