A General Scheme for Training and Optimization of the Grenander Deformable Template Model
نویسندگان
چکیده
General deformable models have reduc edthe need for hand crafting new models for every new problem. But still most of the general models rely on manual inter action by an expert, when applied to a new problem, e.g., for selecting parameters and initialization. In this pap er we prop ose a full and uni ed scheme for applying the general deformable template model proposed by Grenander et al. [7, 13] to a new problem with minimal manual inter action, beside supplying a training set, which can be done by a non-expert user. The main contributions compared to previous work are a supervise d learning scheme for the model parameters, a very fast general initialization algorithm and an adaptive likeliho odmodel based on local means. The model parameters are traine dby a combination of a 2D shap elearning algorithm and a Maximum Likeliho odbased criteria. The fast initialization algorithm is based on a search appr oach using a lter interpr etation of the likelihood model.
منابع مشابه
A Novel Framework for Automated 3D PDM Construction Using Deformable Models
This paper describes a novel framework to build 3D Point Distribution Model (PDM) from a set of segmented volumetric images. This method is based on a deformable model algorithm. Each training sample deforms to approximate all other training shapes. The training sample with best approximation results is then chosen as the template. Finally, the poor approximation results from this template are ...
متن کاملA Berry-Esseen Type Bound for a Smoothed Version of Grenander Estimator
In various statistical model, such as density estimation and estimation of regression curves or hazard rates, monotonicity constraints can arise naturally. A frequently encountered problem in nonparametric statistics is to estimate a monotone density function f on a compact interval. A known estimator for density function of f under the restriction that f is decreasing, is Grenander estimator, ...
متن کاملA Probabilistic Fitness Measure for Deformable Template Models
Methods for automatic image interpretation based on the use of deformable template models have proved very successful. Whatever deformable template scheme is used, one of the basic requirements is a method for assessing the likelihood that a particular model instance is the correct interpretation of a given image. We describe a Bayesian 'fitness' measure which combines the likelihood of the mod...
متن کاملA New Formulation for Cost-Sensitive Two Group Support Vector Machine with Multiple Error Rate
Support vector machine (SVM) is a popular classification technique which classifies data using a max-margin separator hyperplane. The normal vector and bias of the mentioned hyperplane is determined by solving a quadratic model implies that SVM training confronts by an optimization problem. Among of the extensions of SVM, cost-sensitive scheme refers to a model with multiple costs which conside...
متن کاملIdentification of partly destroyed objects using deformable templates
This article addresses the problem of identification of partly destroyed human melanoma cancer cells in confocal microscopy imaging. Complete cancer cells are nearly circular and most of them have a nearly homogeneous boundary and interior region. A deformable template (Grenander, 1993) is well suited for these complete cells and models a cell as a natural deformed template or prototype. We wil...
متن کامل