面向逆向工程的工业CT图像预处理系统开发

 为了将工业CT技术应用于逆向工程中，开发了一个面向逆向工程的工业CT图像预处理系统。该系统主要通过图像处理、轮廓拟合和数据格式转换三个步骤对工业CT切片图像进行处理，输出的IGES格式数据能直接输入到专业化的逆向工程软件中进行３维CAD模型重构，减少了重构３维模型的工作量；输出的２维DXF格式数据能直接输入到AutoCAD软件中进行处理，提高了系统的灵活性。同时，提出了用加权方法计算拟合圆弧的圆心和半径，有效提高了曲线的拟合精度。并通过实例验证了该系统的正确性。

Development of industrial CT image pre-processing system for reverse engineering

To apply industrial computed tomography (CT) technology to reverse engineering effectively, an industrial CT slicing image pre processing system is developed. The system involves three parts, which deal with image process, contour fitting and data format transform. Using professional software of reverse engineering, the output IGES format data of the system can be reconstructed into 3D CAD model directly, which reduces workload of reconstructing 3D CAD model. On the other hand, the output DXF format data of the system can be processed by AutoCAD directly, which improves flexibility of the system. Furthermore, the precision of fitted contour is improved by means of calculating the centre and radius of fitted arc based on weighted method. Finally, the correctness of this system is proved wi