parameters: (src, mean, std=None)
return_statement: return src
docstring: Normalize src with mean and std.
  
      Parameters
      ----------
      src : NDArray
          Input image
      mean : NDArray
          RGB mean to be subtracted
      std : NDArray
          RGB standard deviation to be divided
  
      Returns
      -------
      NDArray
          An `NDArray` containing the normalized image.
docstring_summary: Normalize src with mean and std.
docstring_tokens: Normalize src with mean and std .
function: def color_normalize(src, mean, std=None):
      """Normalize src with mean and std.
  
      Parameters
      ----------
      src : NDArray
          Input image
      mean : NDArray
          RGB mean to be subtracted
      std : NDArray
          RGB standard deviation to be divided
  
      Returns
      -------
      NDArray
          An `NDArray` containing the normalized image.
      """
      if mean is not None:
          src -= mean
      if std is not None:
          src /= std
      return src
function_tokens: def color_normalize ( src , mean , std = None ) : if mean is not None : src -= mean if std is not None : src /= std return src