基于智能手机单目视觉三维重建的小型金属件测量方法

Measurement Method of Small Metal Items Based on Smart Phone’s Monocular Vision 3D Reconstruction

金属件广泛应用于各行各业,螺纹是金属件之间最常见的连接形式,外螺纹测量是金属件接头加工完成后质量检测的重要内容。目前,大部分外螺纹参数测量方法对于检测设备及检测环境的要求较高,无法在常规环境下进行螺纹测量。本文描述了一种基于单目视觉的三维重建方法,利用标定件对智能手机进行标定后,在常规环境下随时随地就可测量任何物品,提高了测量的便捷性。本文选择螺丝作为测量对象,用智能手机对螺纹外径、螺距、螺纹长度三个参数进行测量实验,螺纹外径测量精度为0.02 mm,螺距测量精度为0.01 mm,螺纹长度测量精度为0.02 mm。

Metal parts are widely used in many fields,and the thread is their typical connection type.The thread’s parameters measurement including external diameter is the important part of the quality inspection after the metal thread joint is produced.Most current measurement methods for the thread’s parameters require very professional equipment and strict environment.For the thread’s parameters,there are few measurement methods with normal tool and in nature environment.This paper describes a 3D reconstruction method based on monocular vision of smart phones.After being calibrated with the standard calibrator,the smart phone can measure any product anytime anywhere,which improves the convenience of the measurement.In the experiment,the smart phone is used to measure thread parameters including external diameter,thread pitch and thread length.The measurement accuracy of the external diameter is 0.02mm.The measurement accuracy of the pitch is 0.01 mm.The measurement accuracy of the length of the thread is 0.02 mm.