Font Size: a A A

The Study, Based On Image Feature Extraction Methods For Active Contour Models

Posted on:2005-10-21Degree:MasterType:Thesis
Country:ChinaCandidate:W DingFull Text:PDF
GTID:2208360122992457Subject:Mechanical design and theory
Abstract/Summary:PDF Full Text Request
Contour extraction is an important problem in computer vision, and can be used extensively in many fields such as virtual reality, autonomous guided vehicles, robot environment analysis, object tracking and recognition in monitor system, biology medical image processing, industry online automatic checking and reverse engineering etc. In the field of manufacture, the geometric models are constructed through measuring them, and then they will be used to ameliorate the design and manufacture, this process is called reverse engineering. Reverse engineering is used widely in the field of science study, technology, biomedicine etc, and is used for settling the problem of geometric size measurement, transmogrification measurement, scathe measurement, surveilling the quality of manufacture, profile modeling, CAD/CAM, and physic diagnosis etc. In these techniques, the deformable active model is a hot point research.The deformable active models bring a new viewpoint to traditional computer version, and become one of the most active and successful fields in computer vision and pattern recognition. Therefore, the research of image manipulation based on the deformable active models is important signification of theory and application. In this dissertation, based on the systematically analysis of theory and application research on The deformable active models, a new B-spline deformable active models based on the DP approaches is proposed, and then it is applied to the human face detection and 3D reconstruction based on layer data. The main work and conclusion in this dissertation are as follows:The research, development and application of deformable active contour model is reviewed from geometry representation, scale-spaces and optimization method; the physical essence and the idiographic calculating process of the classical deformable active contour model are also discussed; and the existing problems and possible future research orientations arepresented.The scale-spaces of deformable active contour model has been improved, and a new model based on the MS-MR is presented, which can avoid the local minimum effectively and enforce the capture ability of the deformed active contour model. The convergence speed also has been increased because of few control points.A B-spline deformed active contour model based on DP algorithm is presented. B-spline is the most popular method to present free-form curve and surface, and DP algorithm is the effective approach for solving discrete optimization problems. In this model, the deformed active contour is represented by the cubic B-spline curve segments which are restricted by the control points, and the control points are applied to the calculation of DP algorithm, in the end the contour of image is found. Experiment results show that this model could effectively combine the merits of B-spline and DP algorithm, yielding stable, accurate and faster convergence, and its result is favorable for surface reconstruction.
Keywords/Search Tags:Active contour, Contour extraction, Scale-spaces, DP algorithm, 3-D reconstruction
PDF Full Text Request
Related items