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00008 #ifndef ISOEX_LEVELSETFORCES_HH
00009 #define ISOEX_LEVELSETFORCES_HH
00010
00011
00012
00013
00014 #include <float.h>
00015
00016
00017
00018
00019
00020 namespace IsoEx {
00021
00022
00023
00024
00025 struct Erosion
00026 {
00027 Erosion() {}
00028
00029 float operator()(unsigned int x, unsigned int y, unsigned int z) const
00030 {
00031 return -1.0;
00032 }
00033 };
00034
00035
00036
00037
00038
00039 struct Dilation
00040 {
00041 Dilation() {}
00042
00043 float operator()(unsigned int x, unsigned int y, unsigned int z) const
00044 {
00045 return 1.0;
00046 }
00047 };
00048
00049
00050
00051
00052
00053 template <class LS>
00054 class MeanCurvature
00055 {
00056 public:
00057
00058 MeanCurvature(const LS& _ls) : ls_(_ls) {}
00059
00060 typedef typename LS::_Scalar Scalar;
00061
00062 Scalar operator()(unsigned int x, unsigned int y, unsigned int z) const
00063 {
00064 Scalar Px = ls_.Dx(x,y,z);
00065 Scalar Py = ls_.Dy(x,y,z);
00066 Scalar Pz = ls_.Dz(x,y,z);
00067
00068 Scalar Pxx = ls_.Dxx(x,y,z);
00069 Scalar Pyy = ls_.Dyy(x,y,z);
00070 Scalar Pzz = ls_.Dzz(x,y,z);
00071
00072 Scalar Pxy = ls_.Dxy(x,y,z);
00073 Scalar Pxz = ls_.Dxz(x,y,z);
00074 Scalar Pyz = ls_.Dyz(x,y,z);
00075
00076 Scalar PxPx = Px*Px;
00077 Scalar PyPy = Py*Py;
00078 Scalar PzPz = Pz*Pz;
00079
00080 Scalar nom = ((Pyy+Pzz)*PxPx + (Pxx+Pzz)*PyPy + (Pxx+Pyy)*PzPz
00081 - 2.0*(Px*Py*Pxy + Px*Pz*Pxz + Py*Pz*Pyz));
00082
00083 Scalar denom = pow(PxPx + PyPy + PzPz, 1.5);
00084
00085 Scalar result = -nom/denom;
00086
00087
00088 if (fabs(result) > 1.0) result /= fabs(result);
00089
00090 return result;
00091 }
00092
00093
00094 private:
00095 const LS& ls_;
00096 };
00097
00098
00099
00100 }
00101
00102 #if defined(INCLUDE_TEMPLATES) && !defined(ISOEX_LEVELSETFORCES_C)
00103 #define ISOEX_LEVELSETFORCES_TEMPLATES
00104 #include "LevelSetForces.cc"
00105 #endif
00106
00107 #endif // ISOEX_LEVELSETFORCES_HH defined
00108
00109