Study On The Key Issues Of The Rapid Prototype Directly Driven Based On CT Images

This dissertation mainly studies on the key issues of the rapid prototype directly driven based on CT images,which integrate with a lot high-tech achievement such a ICT,reverse engineering and rapid prototyping.It is not only a core module in product rapid development and product imitating,but also an effective method for introducing domestic or overseas advanced technology.This dissertation studies and accomplishes the major technology of CLI data format conversion based on ICT slice data and the key technology on the rapid prototype directly driven.ICT slice image processing,curve-fitting and contou points sampling,middle contour interpolation and data format exchange are mainly realized and accomplished,which can be concentrated in the following issues:①In ICT slice image processing,image smoothing,image two-valued processing,edg detection and contour tracing are studied and accomplished.Local-average filter,Gaussian filter and median filter are studied in image smoothing.The method of automatic selecting threshold presented by Ostu is used to accomplish image two-valued processing for artifact reducing.Methods of edge detection such as Sobel operator,Robert operator,Kirsch operato Laplacian operator,LOG operator and Canny operator are studied.A contour tracing method based on 8-neighbourhood and 5-neighbourhood is presented for using single pixel link to describe contours.The above is foundation of the whole dissertation,and is the key component in the whole system,whose results determine the following work.②The method of curve-fitting by B-spline is studied and accomplished.The method or threshold for contour points sampling is adopted.The related theory and method are studied too.③Because the distance between the two neighboring ICT slice can not satisfy the condition fo rapid prototyping,middle contour interpolation between the two neighboring ICT slice is necessary.A method of linear interpolation based on minimum distance is adopted and finished for middle contou interpolation.④CLI format is applied to rapid prototyping on the basis of study and analysis or virtue and flaw of STL format.A method of distinguishing inner and outer contour based on radial is adopted for forming CLI format file。In the end,the satisfactory result is given according to the real product. The research in this dissertation is significant in both theory and real application。With the development of ICT technology,which will lead to huge economic profit.Its development will result in great improvement in future product manufacture.