code: @SuppressWarnings({"unchecked"})
  	public static <T extends ImageGray<T>, D extends TupleDesc>
  	DescribeRegionPoint<T,D> pixel( int regionWidth , int regionHeight , Class<T> imageType ) {
  		return new WrapDescribePixelRegion(
  				FactoryDescribePointAlgs.pixelRegion(regionWidth,regionHeight,imageType),imageType);
  	}
docs: Creates a region descriptor based on pixel intensity values alone.  A classic and fast to compute
  descriptor, but much less stable than more modern ones.
  
  @see boofcv.alg.feature.describe.DescribePointPixelRegion
  
  @param regionWidth How wide the pixel region is.
  @param regionHeight How tall the pixel region is.
  @param imageType Type of image it will process.
  @return Pixel region descriptor