Research On The System Of Displacement Measurement Based On Image Processing

In the practice of engineering, micro displacement measurement technology is used more and more widely. At the present time, there are many methods of micro displacement measurement, and they mainly include contact and non-contact measurement methods. However, in some practical projects, measuring micro displacement has had some difficulties in the domain, for example, framework dynamic deflection, micro-vibration displacement, small deformation. This paper researched on technology of micro displacement with high precision in the distance. This measurement technology has had practical significance and applied importance.After analyzing lots of technology of displacement measurement, this paper applied the technology of image high-precision measurement to settling the problem of measuring micro displacement of distant aim with high precision. First of all, this paper analyzed current development situation of micro displacement measurement, and the difficulty that is faced in the domain of micro displacement measurement. According to design idea, design principle and measurement theory, this paper brought forward a project of measuring micro displacement with high precision in the distance, which uses telephotograph and technology of image processing. This paper consists of two parts: the design of the software and the hardware. The part of hardware selected CCD camera, image collecting board, lens, and they consist of image collecting system. The part of software tested the arithmetic by using MATLAB and designed the software of measurement system by using Visual C++. Besides of studying general methods of image processing and their use in this task , this paper had lucubrated the measurement of micro displacement by the sub-pixel image matching technology and showed the precision of this method by detailed dates.In this paper, the measurement of micro displacement by the sub-pixel image matching technology was done some improvements. The new point of view of " the vary of design can work on the precision of measurement " was put forward .When testing the conclusion by experiments,several contrasting experiments in different circs was designed, for example the vary of design,distance and image processing. After using these methods, the precision of measurement had obvious improvement. It made this method advance one-step toward used in engineering.