code: public void setOriginToCurrent() {
  		IT currToWorld = (IT)worldToCurr.invert(null);
  		IT oldWorldToNewWorld = (IT) worldToInit.concat(currToWorld,null);
  
  		PixelTransform<Point2D_F32> newToOld = converter.convertPixel(oldWorldToNewWorld,null);
  
  		// fill in the background color
  		GImageMiscOps.fill(workImage, 0);
  		// render the transform
  		distorter.setModel(newToOld);
  		distorter.apply(stitchedImage, workImage);
  
  		// swap the two images
  		I s = workImage;
  		workImage = stitchedImage;
  		stitchedImage = s;
  
  		// have motion estimates be relative to this frame
  		motion.setToFirst();
  		first = true;
  
  		computeCurrToInit_PixelTran();
  	}
docs: Sets the current image to be the origin of the stitched coordinate system.  The background is filled
  with a value of 0.
  Must be called after {@link #process(boofcv.struct.image.ImageBase)}.