Constructor Detail

• RidgeDetectionUtils

  public RidgeDetectionUtils()

Method Detail

• getAngle

  protected static double getAngle(double x,
                                   double y)

  Returns the angle between the x-axis and a given vector (in components). Always positive.

  Parameters:

  y - - double denoting the y component of the vector.

  x - - double denoting the x component of the vector.

  Returns:

  double denoting the angle between the vector and the x-axis.

• getOctant

  protected static int getOctant(double x,
                                 double y)

  This method determines the octant (neighboring pixel) a vector points towards in pixel space. Explanation: Given a pixel denoted as '0', the neighboring pixels are numbered counterclockwise around pixel 0, beginning with pixel 1 to the right of pixel 0, and ending with pixel 8 one down and one right from pixel 0. The method matches this number to a range of degrees, e.g. a vector in octant 2 would have an angle between 22.5 degrees and 67.5 degrees. This is helpful to determine which neighboring pixels to look at in line detection.

  Parameters:

  y - - double denoting the y component of the vector.

  x - - double denoting the x component of the vector.

  Returns:

  int denoting the octant in which a vector is in.

• getOctantCoords

  protected static int[] getOctantCoords(int octant)

  Creates the modifier array for the octants.

  Parameters:

  octant - - describes the octant modifier needed.

  Returns:

  double[] of length 2, with the first number denoting the modifier to the x-coordinate and the second denoting the modifier to the y-coordinate.

• get2DPoint

  protected static Point get2DPoint(RandomAccess<DoubleType> RA)

  Helper method to take a point in a n-d image and reduce it down to a 2 dimensional point (e.g. in 3D cartesian space removing the z-coordinate from the point).

  Parameters:

  RA - - the random access of the n>2 dimensional image.

  Returns:

  Point in 2D space.

• get2DRealPoint

  protected static RealPoint get2DRealPoint(RandomAccess<DoubleType> RA)

  Helper method to take a point in a n-d image and reduce it down to a 2 dimensional Realpoint (e.g. in 3D cartesian space removing the z-coordinate from the point).

  Parameters:

  RA - - the random access of the n>2 dimensional image.

  Returns:

  Point in 2D space.

• get2DRealPoint

  protected static RealPoint get2DRealPoint(double x,
                                            double y)

  Returns a RealPoint with the coordinates (x, y).

  Parameters:

  x - - the x-coordinate

  y - - the y-coordinate

  Returns:

  a RealPoint with coordinates (x,y)

• getMaxCoords

  protected static long[] getMaxCoords(RandomAccessibleInterval<DoubleType> input,
                                       boolean useAbsoluteValue)