title: Segmentation of dermoscopy images using wavelet networks.
abstract: This paper introduces a new approach for the segmentation of skin lesions in dermoscopic images based on wavelet network (WN). The WN presented here is a member of fixed-grid WNs that is formed with no need of training. In this WN, after formation of wavelet lattice, determining shift and scale parameters of wavelets with two screening stage and selecting effective wavelets, orthogonal least squares algorithm is used to calculate the network weights and to optimize the network structure. The existence of two stages of screening increases globality of the wavelet lattice and provides a better estimation of the function especially for larger scales. R, G, and B values of a dermoscopy image are considered as the network inputs and the network structure formation. Then, the image is segmented and the skin lesions exact boundary is determined accordingly. The segmentation algorithm were applied to 30 dermoscopic images and evaluated with 11 different metrics, using the segmentation result obtained by a skilled pathologist as the ground truth. Experimental results show that our method acts more effectively in comparison with some modern techniques that have been successfully used in many medical imaging problems.
authors.affiliation: Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan, Iran. ar.sadri@ec.iut.ac.ir
authors.forename: Amir Reza
authors.initials: AR
authors.lastname: Sadri
authors.forename: Maryam
authors.initials: M
authors.lastname: Zekri
authors.forename: Saeed
authors.initials: S
authors.lastname: Sadri
authors.forename: Niloofar
authors.initials: N
authors.lastname: Gheissari
authors.forename: Mojgan
authors.initials: M
authors.lastname: Mokhtari
authors.forename: Farzaneh
authors.initials: F
authors.lastname: Kolahdouzan
mesh_terms: D000465:Algorithms; D016208:Databases, Factual; D046169:Dermoscopy / Q000379:methods*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D016018:Least-Squares Analysis; D008545:Melanoma / Q000175:diagnosis / Q000473:pathology; D058067:Wavelet Analysis