基于机器视觉的异形零件尺寸精密测量方法OA

To address the challenges of low precision,high cost,and difficulties in on-line measurement encountered in dimension measurement of special-shaped parts,a scheme of precise dimension measurement of special-shaped parts based on Halcon is proposed,including two parts of hardware and software algorithm.The hardware part mainly selects the industrial camera,industrial lens and light source,and designs the measuring device.In the software algorithm part,the Halcon is utilized for camera calibration to obtain its internal and external parameters.Subsequently,the parts region is obtained through gray processing,threshold segmentation,and other operators.Then,the parameters such as tooth height,outer groove width,outer groove angle,circular hole angle,outer groove depth and tooth number of the special-shaped parts are measured by the methods.This involves selecting the region features,fitting the maximum inner circle and minimum outer circle using least square algorithm,calculating the distance between two lines,determining the angle between two lines,calculating the number of regions and so on.Finally,by comparing the measurement results with high-precision coordinate measuring machines,it is shown that the accuracy in measuring tooth height,outer groove width and outer groove depth for special-shaped parts by our proposed method reaches 0.04 mm while measuring outer groove angle and circular hole angle achieve an accuracy up to 0.03°.