| The technology of system calibration which based on line-structured light is one of the cruxes of line-structured light 3D measurement system when obtaining the geometry of the 3D object with the non-contact way. The line-structured light which is generated by linear laser generator projects onto the surface of object is modulated, and it carries the information of the surface of object. The light stripe which carries the information is taken in by CCD industry camera and then through the motion relationships of the 3D measurement platform,the CCD camera mode is obtained finally.The technology of system calibration is deeply researched in this paper. The main work completed is following:Firstly, the selection of structured light is analyzed and discussed and the 3D measuring principle is introduced. It is expounded that the coordinator transformat relationship between the world coordinate system, camera coordinate system, the image coordinates and pixel coordinates in detail with traditional camera calibration methods.Secondly, the composition, rameter settings and the adjustment steps according to the 3D measuring principle based on the line-structured light are discussed, through which the internal parameters, external parameters and the information of object’s surface could be obtained.Finally, software design of camera calibration system based on the line-structure light is elaborated, then the images, which are gained from CCD industry camera, are processed by using the Matlab software, such as grayscale, binaryzation, area detection and so on and the data gaining process of the two-dimensional coordinates of the image points and theirs’three dimensional world coordinate of the characteristic points is also discussed.The present paper has completed some foundational research work of system’s calibration based on line-structured light, the theoretical analysis and the measurement experiment in this paper provides a foundation for the research of 3D reconstruction. |
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