Curve matching algorithm and its application in fabric automatic register detection

In view of the register detection problem in the rotary screen printing process,the curve matching strategy was proposed to get the position vector of off-pattern-topping on the basis of the rotary screen printing machine automatic detection system via machine vision.In order to ensure that the target edge image and the standard edge image are located in the same coordinate system,Fourier-Mellin curve matching method was used to match them to eliminate the shooting error;and then the curve matching method based on the Fourier transform shift theorem was used to match the well-tuned target edge image and the standard edge image to detect the register error.This matching strategy eliminates the error,and the computation volume is small.The experiments verify that its detection accuracy and computing speed can meet the requirements of the fabric register detection on line.