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Raster-based three-dimensional projection of dental measurement system

Author: SongJun
Tutor: YinZhouPingï¼›LiWenLong
School: Huazhong University of Science and Technology
Course: Mechanical and Electronic Engineering
Keywords: Grating projection Non-contact Edentulous Three-dimensional measurement Camera Calibration No geometric constraints Coordinate registration
CLC: TP391.41
Type: Master's thesis
Year: 2011
Downloads: 49
Quote: 0
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Abstract


With the people's material living standards continue to improve and develop the aging population, the need for prosthodontics growing number of people. The traditional prosthesis manufacturing technology design cycle is long, human intervention and more difficult to guarantee the quality of the restoration, has been unable to meet clinical needs. Establish a three-dimensional digital model of dental achieving dental prosthesis digital design process is the premise that dental CAD / CAM technology is an important part of the design of prosthetic dental machining accuracy depends largely on the measurement accuracy. To this end, we study three-dimensional raster-based dental projection measuring system, the main contents are as follows: This article describes the system the choice of grating projection measuring principle and the measurement ideas, and ideas are given based on a modular measurement system as a whole architecture design, specifically including dental positioning module, the optical path adjustment module, visual measurement module, product appearance module, system calibration module, the encoding and decoding modules, 3D reconstruction module, the point cloud assembly module of eight modules; system requirements are given for the measurement detailed hardware selection and module design for dental measurement system function provides the basic guarantee. This paper studies the camera and projector calibration method, comparing the pros and cons of various calibration methods, on this basis for the widely Zhang Zhengyou calibration method, combined with the measurement object and the system has been applied research, the overall accuracy of the system provides an important support. Without geometric constraints established model of three-dimensional reconstruction, the measuring device reduces the accuracy in terms of processing and assembly requirements help to improve system stability. In this paper, edentulous non-contact optical three-dimensional measurement, calibration function into the proposed fixture design methodology of the measurement process and calibration target analytes spatial coherence; defines monocular vision measurement process involves the coordinate system , is proposed based on coordinate registration point cloud mosaic technique simplifies the point cloud assembly processes to achieve a theoretical zero error point cloud assembly; verified by experiment, obtained with a certain precision dental model three-dimensional point cloud assembly data, To improve dental measuring system speed and overall accuracy to provide a strong support. The use of three-dimensional measuring apparatus of this article conducted a quick survey of dental models, experimental measurement process is stable, a single measurement does not exceed one minute, meanwhile, achieved a certain precision. Measurement speed, made some accuracy for dental CAD / CAM restoration techniques to obtain the original point cloud provides a measurement platform. Meanwhile, the results of this study can be extended to sophisticated detection, heritage restoration with complex surface features such as small-scale digitization of analyte measurement.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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