Vision-based automatic accurate positioning method and device for PCB (printed circuit board)

The invention discloses a vision-based automatic accurate positioning method and device for a PCB (Printed Circuit Board), aiming at the characteristics that an unprocessed PCB is large in area, single in characteristic and relatively large in shape and size. Traditional visual processing is difficult to effectively solve the problem that accurate positioning cannot be achieved due to error amplification caused by the fact that the distance between a camera and a rotating shaft of a robot is large during feeding and discharging of the robot, the method uses a high-precision calibration plate as a positioning mark target, the positioning recognition problem that a positioning object is large and no obvious feature exists is solved, and the positioning accuracy is improved. The problem that accurate positioning is difficult when the area of the PCB material plate is large and no obvious characteristic exists in the existing visual detection technology is effectively solved; an error compensation model is constr