title: Disjunctive Normal Shape and Appearance Priors with Applications to Image Segmentation.
abstract: The use of appearance and shape priors in image segmentation is known to improve accuracy; however, existing techniques have several drawbacks. Active shape and appearance models require landmark points and assume unimodal shape and appearance distributions. Level set based shape priors are limited to global shape similarity. In this paper, we present a novel shape and appearance priors for image segmentation based on an implicit parametric shape representation called disjunctive normal shape model (DNSM). DNSM is formed by disjunction of conjunctions of half-spaces defined by discriminants. We learn shape and appearance statistics at varying spatial scales using nonparametric density estimation. Our method can generate a rich set of shape variations by locally combining training shapes. Additionally, by studying the intensity and texture statistics around each discriminant of our shape model, we construct a local appearance probability map. Experiments carried out on both medical and natural image datasets show the potential of the proposed method.
authors.affiliation: Electrical and Computer Engineering Department, University of Utah, USA.
authors.forename: Fitsum
authors.initials: F
authors.lastname: Mesadi
authors.affiliation: Faculty of Engineering and Natural Sciences, Sabanci University, Turkey.
authors.forename: Mujdat
authors.initials: M
authors.lastname: Cetin
authors.affiliation: Electrical and Computer Engineering Department, University of Utah, USA ; Faculty of Engineering and Natural Sciences, Sabanci University, Turkey.
authors.forename: Tolga
authors.initials: T
authors.lastname: Tasdizen
mesh_terms: D000465:Algorithms; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008297:Male; D010363:Pattern Recognition, Automated; D011467:Prostate / Q000000981:diagnostic imaging*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013008:Somatotypes