{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T20:29:38Z","timestamp":1776889778333,"version":"3.51.2"},"reference-count":61,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2023,1,3]],"date-time":"2023-01-03T00:00:00Z","timestamp":1672704000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"European Commission under European Horizon 2020 Programme, grant number 951911\u2014AI4Media"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Action understanding is a fundamental computer vision branch for several applications, ranging from surveillance to robotics. Most works deal with localizing and recognizing the action in both time and space, without providing a characterization of its evolution. Recent works have addressed the prediction of action progress, which is an estimate of how far the action has advanced as it is performed. In this paper, we propose to predict action progress using a different modality compared to previous methods: body joints. Human body joints carry very precise information about human poses, which we believe are a much more lightweight and effective way of characterizing actions and therefore their execution. Estimating action progress can in fact be determined based on the understanding of how key poses follow each other during the development of an activity. We show how an action progress prediction model can exploit body joints and integrate it with modules providing keypoint and action information in order to be run directly from raw pixels. The proposed method is experimentally validated on the Penn Action Dataset.<\/jats:p>","DOI":"10.3390\/s23010520","type":"journal-article","created":{"date-parts":[[2023,1,4]],"date-time":"2023-01-04T02:54:55Z","timestamp":1672800895000},"page":"520","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Joint-Based Action Progress Prediction"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4424-9185","authenticated-orcid":false,"given":"Davide","family":"Pucci","sequence":"first","affiliation":[{"name":"Media Integration and Communication Center (MICC), University of Florence, 50124 Firenze, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2537-2700","authenticated-orcid":false,"given":"Federico","family":"Becattini","sequence":"additional","affiliation":[{"name":"Media Integration and Communication Center (MICC), University of Florence, 50124 Firenze, Italy"},{"name":"Dipartimento Di Ingegneria Dell\u2019Informazione E Scienze Matematiche, University of Siena, 53100 Siena, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1052-8322","authenticated-orcid":false,"given":"Alberto","family":"Del Bimbo","sequence":"additional","affiliation":[{"name":"Media Integration and Communication Center (MICC), University of Florence, 50124 Firenze, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2023,1,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"480","DOI":"10.1016\/j.eswa.2017.09.029","article-title":"Abnormal behavior recognition for intelligent video surveillance systems: A review","volume":"91","author":"Mabrouk","year":"2018","journal-title":"Expert Syst. 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