docs: public static void histogram(GrayU8 image , int maxPixelValue , TupleDesc_F64 histogram )
  	{
  		int numBins = histogram.size();
  		int divisor = maxPixelValue+1;
  
  		histogram.fill(0);
  
  		for( int y = 0; y < image.height; y++ ) {
  
  			int index = image.startIndex + y*image.stride;
  			for( int x = 0; x < image.width; x++ , index++ ) {
  				int value = image.data[index] & 0xFF;
  				int bin = numBins*value/divisor;
  
  				histogram.value[bin]++;
  			}
  		}
  	}