{"data":{"id":"10.6084/m9.figshare.c.4002913","type":"dois","attributes":{"doi":"10.6084/m9.figshare.c.4002913","prefix":"10.6084","suffix":"m9.figshare.c.4002913","identifiers":[],"alternateIdentifiers":[],"creators":[{"name":"Eaton, Adam","nameType":"Personal","givenName":"Adam","familyName":"Eaton","affiliation":[],"nameIdentifiers":[]},{"name":"Vishwanath, Karthik","nameType":"Personal","givenName":"Karthik","familyName":"Vishwanath","affiliation":[],"nameIdentifiers":[]},{"name":"Chi-Hao Cheng","affiliation":[],"nameIdentifiers":[]},{"name":"Lloyd, Emily","nameType":"Personal","givenName":"Emily","familyName":"Lloyd","affiliation":[],"nameIdentifiers":[]},{"name":"Hugenberg, Kurt","nameType":"Personal","givenName":"Kurt","familyName":"Hugenberg","affiliation":[],"nameIdentifiers":[]}],"titles":[{"title":"A lock-in technique for extraction of pulse rates and\nassociated confidence levels from video"}],"publisher":"Figshare","container":{},"publicationYear":2018,"subjects":[{"subject":"100509 Video Communications","subjectScheme":"FOR"},{"subject":"FOS: Electrical engineering, electronic engineering, information engineering","schemeUri":"http://www.oecd.org/science/inno/38235147.pdf","subjectScheme":"Fields of Science and Technology (FOS)"}],"contributors":[],"dates":[{"date":"2018-02-12","dateType":"Created"},{"date":"2018-05-18","dateType":"Updated"},{"date":"2018","dateType":"Issued"}],"language":null,"types":{"ris":"GEN","bibtex":"misc","citeproc":"article","schemaOrg":"Collection","resourceType":"Collection","resourceTypeGeneral":"Collection"},"relatedIdentifiers":[{"relationType":"IsSupplementTo","relatedIdentifier":"10.1364/ao.57.004360","relatedIdentifierType":"DOI"}],"relatedItems":[],"sizes":[],"formats":[],"version":null,"rightsList":[{"rights":"CC BY 4.0","rightsUri":"https://creativecommons.org/licenses/by/4.0"}],"descriptions":[{"description":"We investigate the practical applicability of video photoplethysmography (VPPG) to extract heart rates of subjects\nusing non-contact color video recordings of human faces collected under typical indoor laboratory conditions using\ncommercial video cameras. Videos were processed following three previously described simple VPPG algorithms to produce\na time-varying plethysmographic signal. These time-signals were then analyzed using a novel, lock-in algorithm that was\ndeveloped to extract the pulsatile frequency component. A protocol to associate confidence estimates for the extracted heart\nrates for each video stream is presented. Results indicate that the difference between heart-rates extracted using the lock-in\ntechnique and gold-standard measurements, for videos with high-confidence metrics, were less than 4 beats per minute.\nConstraints on video acquisition and processing including natural subject motion and the total duration of video recorded\nrequired for evaluating these confidence metrics are discussed.","descriptionType":"Abstract"}],"geoLocations":[],"fundingReferences":[],"xml":"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","url":"https://figshare.com/collections/A_lock-in_technique_for_extraction_of_pulse_rates_and_associated_confidence_levels_from_video/4002913","contentUrl":null,"metadataVersion":2,"schemaVersion":"http://datacite.org/schema/kernel-4","source":"api","isActive":true,"state":"findable","reason":null,"viewCount":0,"viewsOverTime":[],"downloadCount":0,"downloadsOverTime":[],"referenceCount":1,"citationCount":0,"citationsOverTime":[],"partCount":0,"partOfCount":0,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