基于B样条的主动轮廓线法测量液滴接触角

接触角是研究表面浸润性的一个重要参数,传统的液滴接触角测量采用ADSA(axisymmetric drop-shape analysis)技术,假定液滴完全对称,然后利用边侦测技术提取液滴的边线。显然,由于表面性质的多样性,液滴完全对称的假定是不合理的。本文利用图像识别中通常采用的Snake法测量液滴接触角,可以同时测量前进与后退角。为了减少控制点的个数、提高控制点的灵活性以及减小运算量,文章引入3次B样条作为Snake的轮廓线。为了准确得到接触点,将轮廓线作了对称处理。

Measure drop contact angle based B-spline active contour

Contact angle is important parameter in investigating surface wetting. Traditional contact angle measure method takes ADSA technology. It assumes liquid drop is absolute axisymmetric and edge detection module is used. Obviously, since variety of surface property, the assumption of absolute axisymmetric drop isn't rational. Snake method which is used in image distinguish is taken to measure drop contact angle. It can measure both advanced and receded angle. To reduce number of control point, improve flexibility and reduce calculation quantity, thrice B spline is introduce to be contour line. For obtain the precise contact point, the symmetry coordinate of contour is create.