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现有的法矢量测量技术无法满足测量准确度和实时性的双重要求,法矢量计算方法不能适用于不同曲率的曲面。利用双目立体视觉,本文提出了一种基于曲率自适应的法矢量测量方法。首先,在双目立体视觉的基础上,基于变曲率曲面特征建立制孔区域曲面模型,提出投影点的布局方法;然后,基于三维重建的投影点数据,提出了基于曲面曲率自适应识别的法矢量计算方法;最后,针对小曲率曲面样件的测量结果,与三坐标测量仪测得的法矢量进行对比,用以验证本双目视觉测量方法的精度。实验结果表明:该方法测量法矢量误差为1.6°。该方法可有效提高法矢量测量的准确度,满足大型航空零件现场测量的工程要求。
The existing law vector measurement technology can not meet the dual requirements of measurement accuracy and real-time, and the method of vector calculation can not be applied to curved surfaces with different curvatures. Using binocular stereo vision, this paper presents a method of vector-based measurement based on curvature adaptive. Firstly, on the basis of binocular stereo vision, the surface area model of the hole area is established based on the characteristics of the curvature of curvature, and the layout method of the projection point is proposed. Then, based on the projection point data of 3D reconstruction, a method of adaptive recognition based on surface curvature Finally, aiming at the measurement results of small curvature surface samples, the method is compared with the normal vector measured by the CMM to verify the accuracy of the binocular vision measurement method. Experimental results show that the vector error of this method is 1.6 °. This method can effectively improve the accuracy of the method of vector measurement to meet the engineering requirements of on-site measurement of large aeronautic components.