docs: public static void diffAbs( GrayU8 imgA , GrayU8 imgB , GrayU8 output ) {
  		InputSanityCheck.checkSameShape(imgA,imgB);
  		output.reshape(imgA.width,imgA.height);
  
  		if( BoofConcurrency.USE_CONCURRENT ) {
  			ImplPixelMath_MT.diffAbs(imgA, imgB, output);
  		} else {
  			ImplPixelMath.diffAbs(imgA, imgB, output);
  		}
  	}