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  • Last update: 5 years ago
  • Total downloads: 89
  • Operating system: Linux, Mac OS X, Win All, BSD, Solaris
  • Publisher: Khaled Khairy
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scripts default iconDiffusion gradient vector field in 3D (Scripts) Publisher's description

Generate the diffusion gradient vector field as in Xu and Prince 1998

Generate the diffusion gradient vector field as in Xu and Prince 1998
dgvf_calc is the three dimensional extension of the 2D version described in Equation 12
Xu and Prince 1998,"Snakes, Shapes, and Gradient Vector Flow", IEEE Transactions on Image Processing Vol.7(3)

I: three dimensional image (matrix)
miu: the smoothing parameter (more smoothing -- higher miu-- for noisy images)
niter: number of iterations
dt: time step
dx, dy,dz: pixel spacing, set all to one for isotropic images

un, vn, wn: the gradient vector field

Example usage:
[un vn wn] = dgvf_calc(I,sqrt(numel(I)), 0.5, 1, 1, 1, 1)

% Author: Dr.Khaled Khairy, Janelia Farm Research Campus, Howard Hughes Medical Institute.June 2011.
Please send corrections or comments to khairyk@janelia.hhmi.org

System Requirements:

MATLAB 7.11 (2010b)
Program Release Status: New Release
Program Install Support: Install and Uninstall

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