基于图像测量技术的球压压痕尺寸检测方法研究

Study of Measurement of Ball-pressure Indentation Based on Image Measurement Technology

球压试验是许多电器产品国家标准中规定进行,以考核产品中所使用的非金属材料耐热性能的试验。其试验结果的判定依据是试验样品球压压痕尺寸的大小。目前,球压压痕尺寸的测量多采用人工读数的方式,其检测效率和准确度较低。针对球压压痕尺寸检测的难题,结合近年来迅猛发展的机器视觉技术,文中提出了基于图像测量技术的球压压痕尺寸检测方法。该方法由工业相机采集经平行光源照射后的试验样品压痕照片,通过计算机对照片进行处理,利用试验压痕为球形表面的原理,根据压痕亮度阈值判定压痕边界,最后对提取出的边界进行拟合,计算出球压压痕尺寸。

The ball pressure test is an important experiment which assesses the heat endurance of thermoplastic materials in lots of product safety standards.At present, the most tests are measured by the vernier caliper under the microscope.This method is less effcient and precise. In view of this,the paper presents a measurement based on the image measurement technology. This method is to get a clear picture of the indentation through the image acquisition system, which inputs the picture into the computer to process and achieve measurement by extracting the indentation edge rapidly and effectively.