@Override
 public boolean initEnergy(LevelsetSolverDerivatives solver) {
   this.inImg = solver.getInputImg();
   this.deltaHelper = solver.getDeltaApproximator();
   try {
     init();
     return true;
   } catch (MTBActiveContourException e) {
     return false;
   }
 }
 @Override
 public boolean initEnergy(LevelsetSolverDerivatives solver) {
   this.deltaHelper = solver.getDeltaApproximator();
   return true;
 }