Advances in Computational Vision and Medical Image - download pdf or read online

By Chandrajit Bajaj, Samrat Goswami (auth.), João Manuel R. S. Tavares, R. M. Natal Jorge (eds.)

ISBN-10: 1402090854

ISBN-13: 9781402090851

ISBN-10: 1402090862

ISBN-13: 9781402090868

The current e-book comprises prolonged models of papers provided within the overseas convention VIPIMAGE 2007 – ECCOMAS Thematic convention on Computational imaginative and prescient and clinical photograph, held in Faculdade de Engenharia da Universidade do Porto, in 17-19 of October 2007. This convention was once the 1st ECCOMAS thematic convention on computational imaginative and prescient and clinical picture processing. It covers issues comparable with photograph processing and research, scientific imaging and computational modeling and simulation, contemplating their multidisciplinary.

This publication collects the cutting-edge learn, tools and new principles with reference to computational imaginative and prescient and clinical photograph processing contributing for the improvement of those components of knowledge.

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Extra resources for Advances in Computational Vision and Medical Image Processing: Methods and Applications

Example text

In practice, a front propagation algorithm requires three key ingredients: – Given a point x in the grid, a local set of neighbors Neigh(x) connected to x. – A priority P(x) among points x in the front, that allows to select the point to process at a given iteration. 1 Front propagation algorithm 1. Initialization: ∀ x ∈ S ,U(S ) ← 0, S(x) ← Front, ∀y ∈ / S , S(y) ← Far. 2. Select point: x ←− argmin P (z). S(z)=Front 3. Tag: S(x) ← Computed. 4. Update neighbors: for all y ∈ Neigh(x), – If S(y) = Far, then S(y) ← Front and U(y) ← U pdate(y).

Using this local tensor field, the geodesic distance is used to solve many problems of practical interest such as segmentation using geodesic balls and Voronoi regions, sampling points at regular geodesic distance or meshing a domain with geodesic Delaunay triangles. The shortest path for this Riemannian distance, the so-called geodesics, are also important because they follow salient curvilinear structures in the domain. We show several applications of the numerical computation of geodesic distances and shortest paths to problems in surface and shape processing, in particular segmentation, sampling, meshing and comparison of shapes.

The hope is that the front would advance faster in the direction of the goal x1 one wishes to reach. Ultimately, one would like the front to explore only points along the geodesic γ ∈ P(x0 , x1 ) joining the starting point to the ending point. If one has an oracle: V (x) ≈ d(x1 , x) that estimates the remaining geodesic distance from the current point x to the end x1 , one can use as priority map P(x) = U(x) +V (x). The map V is called a heuristic since the exact distance d(x1 , x) is not available in practice.

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Advances in Computational Vision and Medical Image Processing: Methods and Applications by Chandrajit Bajaj, Samrat Goswami (auth.), João Manuel R. S. Tavares, R. M. Natal Jorge (eds.)


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