| In order to integrate industrial computed tomography (CT) and rapid prototype (RP) directly, a method of generating rapid prototype (RP) slice data directly from industrial CT images is proposed in this paper. The method can avoid to generate three dimension CAD modeling and STL files of sample workpieces, improve the efficiency of rapid reverse process and realize profile modeling machining. A soft system is developed, which can output common layer interface (CLI) files (one of format of RP slice data) from industrial CT images.Firstly, the contour data of CT image is extracted. Canny algorithm is adopted to check the edge. In order to get the contour data of workpieces, contour tracking based on eight neighbor field method, discontinuous edge joining based on gap classification and de-noising method based on tracing rules were applied.Secondly, the contour point data was transformed into CLI file. By maching the contour of adjacent layer and extracting feature points of contours, the contour data is simplified. Followed by mathing each feature point of the contour, interpolation of contours between adjacent layers is done to shorten interlayer distance of RP slice, which will meet the accuracy requirement of RP. Then cubic b-spline was applied to fit feature point of each contour. Each fitting contour was divided into numbers of short lines under reqired accuracy. Coordinate of the line endpoint can be used to generate CLI file afer judging internal and external contour.Finally, a soft based on the method mentioned above is designed and developed to generate CLI file directly from industrial CT scanned images.An automobile wheel and a teapot are used as examples in this paper. The CLI files output by the developed soft are checked in ARPS2004, which is the system soft of AFS-320YS RP machine. A RP product of the teapot is obtained by AFS-320YS using its CLI file. The validity of the mothed is verified by results. |
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