Package gov.nih.mipav.model.algorithms.levelset

Class LseGaussianBlur3

  • public class LseGaussianBlur3
extends LsePdeFilter3

    This class implements the Gaussian blur filter for 3D images using a finite-difference-based solver for the partial differential equation:

        du/dt = Laplacian(u)

    where u(x,y,z,t) is the evolved image at time t, du/dt is the time derivative of u, and Laplacian(u) = u_xx + u_yy + u_zz, a sum of second-order derivatives of u.

    Version:
    0.1 November 7, 2006
    Author:
    David Eberly

    • Field Detail

      • m_fMaximumTimeStep

        private float m_fMaximumTimeStep
        The maximum time step allowed for numerical stability of the filter.

    • Constructor Detail

      • LseGaussianBlur3

        public LseGaussianBlur3​(int iXBound,
                        int iYBound,
                        int iZBound,
                        float fXSpacing,
                        float fYSpacing,
                        float fZSpacing,
                        float[] afData,
                        boolean[] abMask,
                        float fBorderValue,
                        int eScaleType)
        Creates a new LseGaussianBlur3 object.
        Parameters:
        iXBound - The x-bound of the image.
        iYBound - The y-bound of the image.
        iZBound - The z-bound of the image.
        fXSpacing - The x-spacing of the image.
        fYSpacing - The y-spacing of the image.
        fZSpacing - The z-spacing of the image.
        afData - The image elements, stored in lexicographical order.
        abMask - The image mask, stored in lexicographical order. A pixel value is processed by the PDE solver only when the mask value is false.
        fBorderValue - Specifies how to handle the image value. When set to Float.MAX_VALUE, Neumann conditions are in use, in which case zero-valued derivatives are assumed on the image border. Otherwise, Dirichlet conditions are used, in which case the image is assumed to be constant on the border with value specified by fBorderValue.
        eScaleType - The type of scaling to apply to the input image. The choices are NONE, UNIT, SYMMETRIC, or PRESERVE_ZERO.

    • Method Detail

      • getMaximumTimeStep

        public final float getMaximumTimeStep()
        Get the maximum time step for numerical stabilty of the filter.
        Returns:
        The maximum time step.

      • onUpdate

        protected void onUpdate​(int iX,
                        int iY,
                        int iZ)
        The per-voxel update function of the PDE solver.
        Specified by:
        onUpdate in class LsePdeFilter3
        Parameters:
        iX - The x-value of the voxel to be updated.
        iY - The y-value of the voxel to be updated.
        iZ - The z-value of the voxel to be updated.