Optical measurement of special cigarette filter based on OpenCV

This paper presents an automatic optical non-contact measurement method to measure the groove depth, groove number and groove surface area ratio of grooved cigarette filter. After preprocessing of the image of grooved filter, Morphological open operation was used to eliminate false groove detection. Then the contours of outer boundary and grooves were found and the parameters of the filters were calculated. The accuracy of 5 micrometers can be reached.