| In area of advanced manufacturing technology, Rapid Reverse Engineering based on industrial CT slicing image becomes a focus on research. Its emphasis lies in from industrial slicing images generating the datum, which can be accepted by rapid prototyping equipment. In this dissertation, some key technologies related to it were researched.First of all, image processing of ICT slicing image was accomplished. The means of median filter was chosen to smooth the slicing image. The segmentation based on histogram of gray image was adopted, which is. Appropriate to slicing images. The Kirsch operator was chose to achieve the edge detecting by tests and analyses. By contour extracting and contour tracing, the features of the contours were got. The inner and outer loops were judged and the 3-D coordinate was outputted as txt format that was the base of producing the STL file,Secondly, the triangle meshing of contour loops that includes triangle plane filling between layers and section triangle plotting was accomplished. In triangle plane filling between layers, the loop matching operator between layers was adopted, which is that the loops were matched according to their characters, geometry centers and perimeters. Four kinds of regular algorithm in filling between layers were analyzed, and the shortest diagonal algorithm, which was rather fit to this dissertation, was adopted in this dissertation. The contour loops of section were grouped and each loop was split to make each loop become a single outer loop that was triangle split with Delaunay algorithm. The triangle meshes were written to form the STL file that can be accepted by rapid prototype manufacturing.In the end, the software was developed to achieve the function. In contrast with the method of using exiting CAD software to make STL file after reconstructing the CAD model, the correctness of the result and feasibility of the method in this dissertation was verified, moreover, the develop periods was shortened. |
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