Fig. 3
From: Surrogate-assisted optimization of roll-to-roll slot die coating
Schematic illustrating the image analysis process; first the green color plane is extracted from the wide angle image of the coating. After that, a threshold is conducted to isolate the coated region from the substrate. The mean grey value and standard deviation of grey values are then calculated from the pixel intensities within the threshold region. The thickness difference is calculated as the difference between the mean grey value and the target thickness. The target thickness is the expected coating thickness assuming a 10 mm wide uniform coating is produced.
