Coating system and calibration method thereof

A calibration method for a coating system, wherein the coating system comprises:

• a first roller and a second roller;
• a calibration ruler, disposed on the first roller or the second roller and comprising a plurality of calibration blocks arranged in a staggered manner;
• an encoder, coaxially mounted with the first roller or the second roller, or mounted on a support and in contact with the first roller or the second roller by means of press-wheel mounting;
• one or a plurality of line scan cameras, disposed on one side of the first roller or the second roller, wherein an imaging field of view of the one or plurality of line scan cameras corresponds to the calibration ruler;
• and a controller;
• the calibration method comprises:
• generating, by the encoder, a first trigger signal when driven by the first roller or the second roller;
• photographing, by the line scan camera, the calibration ruler to acquire an image after receiving the first trigger signal or upon being triggered by a second trigger signal generated inside the line scan camera;
• and
• computing, by the controller, at least one of a lateral accuracy and a longitudinal accuracy of the line scan camera based on the image.