{"type":"ScholarlyArticle","title":"Temporal Event Recognition: An Application to Left Ventricular Performance","authors":[{"name":"John K. Tsotsos","slug":"john-k-tsotsos","given":"John K.","family":"Tsotsos","affiliation":""}],"abstract":"The problem of recognition of time-varying events, particularly molion concepts, is discussed and a framework for the abstraction of such concepts is briefly presented. We have de~igned 11nd implemented a knowledge-based expert system for motion understanding that incorporates several novel features. A frame-based representation , which includes exception handling via similarity links and the organizational primitives IS-A and PART-OF is used to construct a knowledge base of temporal concepts. This knowledge base drives the recognition process that integrates the paradigms of hypothesize-andtP.qt l'lnrl r.nmpP.t.itinn i'lnd en-operation among conceptually adjacent hypotheses . The recognition stra · tegy also includes a hypothesis rating scheme that. is amenable to empirical performance analysis . This framework has been applied to the problem of human left ventricular performance evaluation from image sequences, and thus the knowledge base also contains much uf lht: cUl'rent understanding of left ventricular dynamics . This paper describes some aspects of this application in detail and presents a complet~> analy~iof a typical image sequence, emphasizing comparisons between human and computer analysis . Additional justification of the adequacy of the framework has been obtained using empirical studies of the hypothesis rating scheme.","doi":null,"url":"https://ijcai.org/proceedings/1981/171","pdf":"https://ijcai.org/proceedings/1981/0171.pdf","markdown":"https://ijcai.org/proceedings/1981/171.md","bibtex":"https://ijcai.org/proceedings/1981/bibtex/171","volume":{"slug":"1981","title":"Proceedings of the Seventh International Joint Conference on Artificial Intelligence","short_title":"IJCAI 1981","url":"https://ijcai.org/proceedings/1981/","year":1981,"location":"Vancouver, British Columbia, Canada","dates":"24-28 August 1981","editors":"Roger C. Schank","isbn":"","publisher":"International Joint Conferences on Artificial Intelligence","doi_prefix":""},"section":"Medical Application","track":"Medical Application","number":171,"pages":{"first":900,"last":906},"keywords":[],"videos":[],"references":[],"license_note":"Copyright International Joint Conferences on Artificial Intelligence."}