基于ICT切片图像数字化分析的反求建模方法

目的 建立复杂结构产品零件的反求建模方法。方法借助非接触测量设备获取产品零件的尺寸数据或图像，并通过分析计算和CAD软件等辅助工具，建立产品的几何模型。结果将新一代三维工业CT作为测量手段，对产品实物的切片图像进行数字化分析、图像边界提取和二维轮廓数据读取，并对生成的产品数字模型进行了误差分析。得到反求建模技术和三维产品数学模型。结论所得技术适合于小型、复杂和不可拆卸产品零件的设计和再设计工作；所得模型为产品进入再设计阶段奠定基础；应依据产品的结构特点和设计精度确定ICT切片采样分辨率。

Reverse design method for industrial product model based on digital image processing of ICT slice pictures

AimTo establish the reverse design method for complex structural industrial product. MethodsBased on the non-contact measuring equipment such as industrial computed tomograph(ICT) and it's slice pictures,the steps involved in the reverse engineering are identified for creating a computed aided design model of complex structural industrial product by using the digital image processing and CAD software . ResultsThe methods of image segmentation, seed-filling and 2D-feature extraction are described in detail. According to different resolution of ICT equipment for obtaining the ICT slice pictures the tolerance analysis between the prototype product and CAD-model is presented to demonstrate that the proposed methods are viable.ConclusionThe obtained reverse design technique based on the non-contact measuring are suited for the design and redesign of the parts of the small, complex industrial products which are not disassembled; the error of the acquired 3D product's mathematical model is within our acceptable range; ascertain sampling resolution of ICT slices according to the structure features of the products and the design precision of the equipment.