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Theses

MULTISENSOR INTEGRATION AND DISCRETE GEOMETRY PROCESSING FOR COORDINATE METROLOGY

Abstract : Multisensor integration systems are used to fulfill the increasing requirements on the complexity and accuracy of coordinate metrology. This thesis investigates on the achievement of multisensor integration in coordinate metrology from two main parts: function and data modeling; and discrete geometry processing. Function and data modeling allow obtaining clear understanding of the system and guiding the system development. Hierarchical function models of the system are built using IDEF0 methodology. An ontology based method is employed to model the various data and their relationships in the system with structured representation. Efficient methods for discrete geometry processing to support multisensor integration are the main focus of this dissertation. Reliable estimation of the curvatures is essential for discrete shapes processing. A tensor based method is proposed for discrete curvature estimation. The proposed method provides better performance according to a comparative analysis. Registration is one of the most important and decisive steps of multisensor integration. Registration algorithms enable to align the different point data captured in the respective sensor's coordinate systems. A registration method is proposed to align different discrete shapes with unknown correspondences. A combination of curvature information and Euclidean distance is used to improve the registration performance. A new method is developed for shape recognition and segmentation based on shape index and curvedness. The local surface type of a vertex is recognized according to its shape index and curvedness. The vertices are then clustered according to their local surfaces. A connected region generation algorithm is then implemented to generate the segmentation results. Considerable cases are tested and the method provides satisfying results. A new software framework DSP-COMS is developed as the testing platform of the developed methods. A detailed case study of an industrial workpiece digitized by laser scanning and touch probing is presented. The measured point data are then processed using DSP-COMS. The results show that the proposed methods can provide satisfying results for the studied case.
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Submitted on : Thursday, January 28, 2010 - 3:41:16 PM
Last modification on : Thursday, February 9, 2017 - 3:56:37 PM
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  • HAL Id : tel-00451244, version 1

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Haibin Zhao. MULTISENSOR INTEGRATION AND DISCRETE GEOMETRY PROCESSING FOR COORDINATE METROLOGY. Mechanics [physics.med-ph]. École normale supérieure de Cachan - ENS Cachan, 2010. English. ⟨tel-00451244⟩

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