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Automatic Localization and Comparison for Free-Form Surface Inspection

机译：自动定位和比较自由曲面检查

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With the increasing and extensive application of free-form surfaces in many fields, the inspection of manufactured free-form surfaces has become all the more important. To compare two free-form surfaces, the manufactured surface and the design model must be brought to the same coordinate system through localization. This paper introduces a feature-based method for the automatic localization and comparison of free-form surfaces for inspection. This method localizes the measurement surface to the design model through two steps. The first step is general localization based on the correspondence between the features extracted from both surfaces. The second step is fine localization that solves the point-to-point correspondence and localizes the surfaces accurately.The grid-subdivide method is proposed to improve the robustness and stability in searching for corresponding points. The free-form surfaces can have arbitrary positions and orientations in 3-D space.The entire process is automatic. Experiments have been carried out, and the results show that this automatic method is efficient and robust. A software prototype has been developed to demonstrate that this method can be applied directly to practical engineering inspections of parts with free-form surfaces.
机译：随着自由曲面在许多领域的广泛应用，制造自由曲面的检查变得越来越重要。要比较两个自由曲面，必须通过定位将制造的曲面和设计模型带到相同的坐标系。本文介绍了一种基于特征的方法，可以对自由曲面进行自动定位和比较，以进行检查。此方法通过两个步骤将测量表面定位到设计模型。第一步是基于从两个表面提取的特征之间的对应关系进行一般定位。第二步是精细定位，解决点对点对应关系并精确定位曲面。提出了网格细分方法，以提高搜索对应点的鲁棒性和稳定性。自由曲面可以在3-D空间中具有任意位置和方向。整个过程是自动的。已经进行了实验，结果表明该自动方法是有效且鲁棒的。已经开发了软件原型，以证明该方法可以直接应用于具有自由曲面的零件的实际工程检查中。

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