code: public void setInterpolation( double inputMin , double inputMax, double derivMin , double derivMax ,
  								  InterpolationType type) {
  		interpI = FactoryInterpolation.createPixelS(inputMin,inputMax,type, BorderType.EXTENDED, imageType.getImageClass());
  		interpDX = FactoryInterpolation.createPixelS(derivMin,derivMax,type, BorderType.EXTENDED, derivType.getImageClass());
  		interpDY = FactoryInterpolation.createPixelS(derivMin,derivMax,type, BorderType.EXTENDED, derivType.getImageClass());
  	}
docs: Used to change interpolation method.  Probably don't want to do this.
  @param inputMin min value for input pixels. 0 is typical
  @param inputMax max value for input pixels. 255 is typical
  @param derivMin min value for the derivative of input pixels
  @param derivMax max value for the derivative of input pixels
  @param type Type of interpolation method to use