To solve the problem of low efficiency of manual inspection in the diaper production line

a visual inspection system for diaper label was developed using Visual C++6.0.Production images was grabed with color industrial camera.The diaper elastic waist’s location and waist label’s angle was analyzed and judged.The elastic waist detection separated the elastic waist from the background through adjusting brightness and contrast

extracted pixels with specified color in HIS space

color extracting

and dynamic binarization.The waist’s location was determined by counting the valid pixels in the target area.As to waist label detection

dynamic binarization and edge detection are used to obtain the border of the waist label from background.The label’s angle was obtained by scanning the image.Experimental results show that this system can effectively resolve the problem of weak light and low contrast

fold interference

and realize a stable online inspection for diaper label.