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Gradient Vector Flow SnakePowerPoint Presentation

Gradient Vector Flow Snake

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Presentation Transcript

Problem Description

- Finding Object Boundaries
- Snake (Active Contour) is extensively used
- Initialization
- Poor convergence to boundaries concavities

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)

- 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)

- Parametric curve solving

Validate

- Images in the authors website
- Images from the Intelligent Scissors Lab

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