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Principles of Video Contact Angle Analysis, Medicine, Page 8

Principles of Video Contact Angle Analysis

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Drop Shape Determination by AutoFAST Algorithm

To keep the calculation objective,
AutoFAST algorithm uses second-order
binary curves to simulate the shape of
drop without any theoretical modeling


Algorithm:
• Find points at the edge of drop
• Fit a curve to the drop edge.
• Find points at the contact
boundary
• Fit a curve to the contact boundary The AutoFAST algorithm automatically
• Find the intersections of the two determines drop edge and contact
curves and calculate the slopes at boundary. The RED lines are the
the two intersections actual simulated curves. Mark L and R
are left and right intersections of curves,
respectively.
Second-order Binary Equation
a5 x 2  4 xy  3 y 2  2 x  1 y  0 
a a a a a 0

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