docs: public static int countRegionPixels(GrayS32 labeled , int which ) {
  		int total = 0;
  		for( int y = 0; y < labeled.height; y++ ) {
  			int index = labeled.startIndex + y*labeled.stride;
  			for( int x = 0; x < labeled.width; x++ ) {
  				if( labeled.data[index++] == which ) {
  					total++;
  				}
  			}
  		}
  		return total;
  	}