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Research on the Key Technology of Structured Light Three-Demension Measuring System

Author: QinDaHui
Tutor: WangCongJun
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: Reverse engineering Machine Vision Grating encoder Epipolar constraint Grating stripes match
CLC: TH74
Type: Master's thesis
Year: 2005
Downloads: 593
Quote: 4
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Abstract


Reverse engineering is an integrated use of computer vision, computer graphics, control theory, digital image processing, sensors and other advanced theories, technologies and methods of system engineering, interdisciplinary field of cutting-edge research. The rapid development of reverse engineering and advanced manufacturing technologies such as rapid prototyping technology combine to bring a new model for the world's manufacturing. Three-dimensional measuring device as retrograde engineering in the advanced manufacturing sector plays an increasingly important role, is widely used in product design, manufacturing, measurement and production process timely detection. The development of state-of-the-art reverse engineering measuring equipment has become the key to advanced rapid manufacturing response. In this paper, on the basis of reverse engineering measuring equipment development, structured light 3D measurement system developed. Structure light 3D measurement system proposed in this paper is a raster-structured light scanning binocular vision measurement techniques. Surface scan speed, there is a great advantage, can be measured free-form surface fast, high-precision three-dimensional measurement. The main work of the paper is as follows: (1) the development status quo and development trend of reverse engineering measuring equipment, discuss the advantages and disadvantages of the various measurement techniques. The proposed research direction, the development of structured light 3D measurement system. (2) discuss the basics of machine vision, identified through theoretical analysis and experimental verification, structured light 3D measurement system hardware components and design, developed experimental prototype. (3) The image acquisition system and motion control system is the basis of the measurement equipment, and a great influence on the back of the stereo matching accuracy. Analysis of the working principle of the system, according to the system requirements, the set of feasible solutions of the control system and image acquisition system, and given the structure of the two systems of hardware and software implementations. (4) detecting non-contact measurement of the depth information is the most important, the most critical step. The key is to determine the structure the optical binocular vision measurement technology around grating stripes of light plane corresponding relationship. Discuss various coding techniques, a grating encoding method, a good solution to the coding problem of the grating. The the epipolar constraint grating-based matching algorithm, good in theory to solve the depth information of the three-dimensional measurement system based on structured light machine vision measurement problem. Solve the key issues of the development of the device.

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