Aiming at the real-time and precise inspection of sheet metal part edges

a binocular vision-based inspection system that mainly consists of two CMOS cameras and multiple line laser transmitters is developed. The handheld inspection device is continuously moved around the edge of the measured sheet metal part with the circular marks on the surface

while the line laser transmitters project laser stripes to the edge of the sheet metal part. The cameras acquire the synchronized image pair in real time and transmit them to the computer. The system software performs incremental 3D reconstruction of the laser stripe centers on the sheet metal edge in real time via parallel processing. The workflow

software and hardware structure of the system are introduced. The key techniques such as real-time extraction of laser stripe center points and real-time registration of the 3D measurement points are discussed in detail. The inspection speed of the developed system is verified to be more than 30fps

and the measurement points on the sheet metal edges output by the system is of high quality. Moreover

experiments on a planar side wall with 1mm thickness shows that the mean inspection error of SMEIS system is about 0.04mm

and the standard deviation is about 0.03mm.