docs: public static GrayU8 edge4(GrayU8 input, GrayU8 output, boolean outsideZero ) {
  		output = InputSanityCheck.checkDeclare(input, output);
  
  		if( BoofConcurrency.USE_CONCURRENT ) {
  			ImplBinaryInnerOps_MT.edge4(input, output);
  		} else {
  			ImplBinaryInnerOps.edge4(input, output);
  		}
  		ImplBinaryBorderOps.edge4(input, output, outsideZero);
  
  		return output;
  	}