title: Improving pit-pattern classification of endoscopy images by a combination of experts.
abstract: The diagnosis of colorectal cancer is usually supported by a staging system, such as the Duke or TNM system. In this work we discuss computer-aided pit-pattern classification of surface structures observed during high-magnification colonoscopy in order to support dignity assessment of colonic polyps. This is considered a quite promising approach because it allows in vivo staging of colorectal lesions. Since recent research work has shown that the characteristic surface structures of the colon mucosa exhibit texture characteristics, we employ a set of texture image features in the wavelet-domain and propose a novel classifier combination approach which is similar to a combination of experts. The experimental results of our work show superior classification performance compared to previous approaches on both a two-class (non-neoplastic vs. neoplastic) and a more complicated six-class (pit-pattern) classification problem.
authors.affiliation: Dept. of Gastroenterology & Hepatology, Medical University of Vienna, Austria.
authors.forename: Michael
authors.initials: M
authors.lastname: Häfner
authors.forename: Alfred
authors.initials: A
authors.lastname: Gangl
authors.forename: Roland
authors.initials: R
authors.lastname: Kwitt
authors.forename: Andreas
authors.initials: A
authors.lastname: Uhl
authors.forename: Andreas
authors.initials: A
authors.lastname: Vécsei
authors.forename: Friedrich
authors.initials: F
authors.lastname: Wrba
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D003111:Colonic Polyps / Q000473:pathology*; D015179:Colorectal Neoplasms / Q000473:pathology*; D016099:Endoscopy, Gastrointestinal / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D015588:Observer Variation; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity