Research on contact angle measurement method based on improved Canny-Devernay sub-pixel edge detection algorithm
To solve the problem that traditional Canny algorithm is not accurate to detect the edge of a drop,which leads to a large contact angle measurement error,this paper proposes an improved Canny-Devernay subpixel edge de-tection algorithm.The algorithm improves traditional Canny algorithm by replaceing gaussian filter with fast-guided fil-ter,calculateing gradient and direction through the operator based on PLIP model,and adopting a local maximum inter-class variance method to achieve adaptive threshold selection.Finally,the improved Canny algorithm is combined with Devernay correction algorithm to realize sub-pixel edge detection.Experiments show that compared with the tradi-tional Canny algorithm,the improved algorithm has more advantages in retaining droplet edge information.When the contact angle measurement method based on this algorithm is detected with a contact angle standard chip,the absolute error and mean of variance can reach as low as 0.011°and 0.009°.
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