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Gradient Vector Flow Snake

Gradient Vector Flow Snake. C. Xu and J. L. Prince Project Proposal by Charlie Neo. Problem Description. Finding Object Boundaries Snake (Active Contour) is extensively used Initialization Poor convergence to boundaries concavities. Previous Work.

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Gradient Vector Flow Snake

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  1. Gradient Vector Flow Snake C. Xu and J. L. Prince Project Proposal by Charlie Neo

  2. Problem Description • Finding Object Boundaries • Snake (Active Contour) is extensively used • Initialization • Poor convergence to boundaries concavities

  3. Previous Work • M. Kass, A. Witkin, and D. Terzopoulos, “Snakes: Active contour models,” Int. J. Comput. Vis., vol. 1, pp. 321–331, 1987. • V. Caselles, R. Kimmel, and G. Sapiro, “Geodesic active contours,” in Proc. 5th Int. Conf. Computer Vision, 1995, pp. 694–699. • L. D. Cohen, “On active contour models and balloons,” CVGIP: Image Understand., vol. 53, pp. 211–218, Mar. 1991. • C. Xu and J. L. Prince, ``Snakes, Shapes, and Gradient Vector Flow,'' IEEE Transactions on Image Processing, 7(3), pp. 359-369, March 1998.

  4. Algorithm (GVF) • Edge map f (x,y) from Image • Gradient vector flow field • That minimizes energy function • GVF can be found by solving Euler equation as a function of time

  5. Algorithm (GVF Snake) • Parametric curve solving

  6. Examples

  7. 3D surfaces

  8. Validate • Images in the authors website • Images from the Intelligent Scissors Lab

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