Gradient vector flow snake
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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

Gradient Vector Flow Snake

C. Xu and J. L. Prince

Project Proposal by Charlie Neo


Problem description
Problem Description

  • Finding Object Boundaries

  • Snake (Active Contour) is extensively used

  • Initialization

  • Poor convergence to boundaries concavities


Previous work
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.


Algorithm gvf
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


Algorithm gvf snake
Algorithm (GVF Snake)

  • Parametric curve solving




Validate
Validate

  • Images in the authors website

  • Images from the Intelligent Scissors Lab


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