Abstract: The measurement of the size parameters of three-dimensional products is the base of gaining the design drawings from the products in reverse engineering. However, the measurement of the internal structure in products is difficult to achieve, especially the closed lumen by traditional measurement methods. A measurement method which is about surface area and lumen volume of industrial Computed Tomography (CT) three-dimensional images was studied, the C-V method was used to segment the industrial CT images, and area and volume were calculated based on getting the contour points of target area. In order to get smooth surface, the distance data between points on the surface and the center point was calculated, then Gaussian filter was used to remeasure the contour filter. The experimental results show that the method has better precision compared to the traditional measurement methods.

Key words: reverse engineering, three-dimensional measurement, industrial Computed Tomography (CT), image segmentation, contour filter

摘要： 三维工件尺寸参数的测量，是从工件出发获得设计图纸的逆向工程的基础。但工件内部结构特别是封闭内腔的测量用传统测量方法难于实现。研究了基于工业CT的三维图像曲面面积与内腔体积测量的算法，针对工业CT断层图像，用C-V方法分割，在得到目标区轮廓点的基础上，计算面积与体积。为了使得到的曲面平滑，计算曲面上点到形心的距离并用高斯卷积进行轮廓滤波再测量。实验结果表明：该方法与传统的先图像去噪再分割测量的方法相比，有较好的测量精度。

关键词: 逆向工程, 三维测量, 工业CT, 图像分割, 轮廓滤波