topostats.statistics
====================

.. py:module:: topostats.statistics

.. autoapi-nested-parse::

   Function for calculating statistics about a whole image, for example number of grains or surface roughness.

   ..
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Attributes
----------

.. autoapisummary::

   topostats.statistics.LOGGER


Functions
---------

.. autoapisummary::

   topostats.statistics.image_statistics
   topostats.statistics.roughness_rms


Module Contents
---------------

.. py:data:: LOGGER

.. py:function:: image_statistics(image: numpy.ndarray, filename: str, pixel_to_nm_scaling: float, results_df: pandas.DataFrame) -> pandas.DataFrame

   
   Calculate statistics pertaining to the whole image, for example the size of the image in pixels and
   metres, the root-mean-squared roughness and the grains per metre squared.

   :param image: Numpy 2D image array of the image to calculate stats for.
   :type image: np.ndarray
   :param filename: The name of the file being processed.
   :type filename: str
   :param pixel_to_nm_scaling: Float of the scaling factor between pixels and nanometres.
   :type pixel_to_nm_scaling: float
   :param results_df: Pandas DataFrame of statistics pertaining to individual grains including from grainstats and
                      dna tracing.
   :type results_df: pd.DataFrame

   :returns: Dictionary of image statistics.
   :rtype: dict















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.. py:function:: roughness_rms(image: numpy.ndarray) -> float

   
   Calculate the root-mean-square roughness of a heightmap image.

   :param image: 2D numpy array of heightmap data to calculate the roughness of
   :type image: np.ndarray
   :param Returns:
   :param float: The RMS roughness of the input array.















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