Active Contour Models. (Snakes). Yujun Guo. Applications. Applications -- Medical. Solution. Use generalized Hough transform or template matching to detect shapes But the prior required are very high for these methods.
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Active Contour Models
GVF snake model
(Diagram courtesy “Snakes, shapes, gradient vector flow”, Xu, Prince)
What are these energy terms which do the trick for us??
f(x,y) is the edge map of the image.
2 Is the Laplacian operator.
(Diagrams courtesy “Snakes, shapes, gradient vector flow”, Xu, Prince)
Image with initial contour
Magnetic resonance image of the left ventricle of human heart
Notice that the image is poor quality with sampling artifacts
Ref: C. Xu, A. Yezzi, and J. L. Prince, “On the relationship between Parametric and Geometric Active Contours”, TR JHU/ECE 99-14