docs: def convert(self, point):
          """
          Convert a point from one coordinate system to another.
  
          Args:
            point: tuple(int x, int y)
              The point in the original coordinate system.
  
          Returns:
            converted_point: tuple(int x, int y)
              The point in the new coordinate system.
  
          Example: convert coordinate from original image into a pixel location
            within a cutout image.
  
          @rtype: list(float,float)
          """
          x, y = point
          (x1, y1) = x - self.x_offset, y - self.y_offset
          logger.debug("converted {} {} ==> {} {}".format(x, y, x1, y1))
          return x1, y1