title: Spatiotemporal smoothing as a basis for facial tissue tracking in thermal imaging.
abstract: Accurate tracking of facial tissue in thermal infrared imaging is challenging because it is affected not only by positional but also physiological (functional) changes. This paper presents a particle filter tracker driven by a probabilistic template function with both spatial and temporal smoothing components, which is capable of adapting to abrupt positional and physiological changes. The method was tested on tracking facial regions of subjects under varying physiological and environmental conditions in 25 thermal clips. It demonstrated robustness and accuracy, outperforming other strategies. This new method promises improved performance in a number of biomedical applications that involve physiological measurements on the face, such as unobtrusive sleep and stress studies.
authors.affiliation: Elekta Inc., Maryland Heights, MO 63043, USA.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhou
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Tsiamyrtzis
authors.forename: Peggy
authors.initials: P
authors.lastname: Lindner
authors.forename: Ilya
authors.initials: I
authors.lastname: Timofeyev
authors.forename: Ioannis
authors.initials: I
authors.lastname: Pavlidis
mesh_terms: D000465:Algorithms; D016208:Databases, Factual; D005145:Face / Q000502:physiology*; D019416:Head Movements / Q000502:physiology; D006801:Humans; D007259:Infrared Rays; D012815:Signal Processing, Computer-Assisted; D013817:Thermography / Q000379:methods*