Using the Hough Transform in the Automatization of Contact Angle Calculation

In this paper an algorithm for automatic contact angle calculation is presented. This algorithm came forth because of the need for a procedure which would minimize the variability that comes with the previously mentioned calculations. With the use of the Hough Transform this has been achieved. In the process of edge extraction, Sobel operators in combination with mean thresholding and morphological operations were implemented. Afterwards, Hough transforms for line and circle were used. With the use of analytic geometry on these features, contact angle was calculated. The described algorithm is compared to the ImageJ plugin for contact angle measurement.