code: public FDistort setRefs( ImageBase input, ImageBase output ) {
  		this.input = input;
  		this.output = output;
  
  		inputType = input.getImageType();
  		return this;
  	}
docs: All this does is set the references to the images.  Nothing else is changed and its up to the
  user to correctly update everything else.
  
  If called the first time you need to do the following
  <pre>
  1) specify the interpolation method
  2) specify the transform
  3) specify the border
  </pre>
  
  If called again and the image shape has changed you need to do the following:
  <pre>
  1) Update the transform
  </pre>