def __init__(self, coords1, coords2):
    self.__coords1 = coords1
    self.__coords2 = coords2

def compare_coords(self):
    """Return a score on how image coordinates are similar.

        :return: (float) value between 0. and 1. The highest the closer.

        """
    if self.__coords1 is None:
        logging.error('Cant compare coordinates: coords1 is None')
        return -1
    if self.__coords2 is None:
        logging.error('Cant compare coordinates: coords2 is None')
        return -1
    area1 = self.__coords1.area()
    area2 = self.__coords2.area()
    intersec = self.__coords1.intersection_area(self.__coords2)
    return intersec / ((area1 + area2) / 2.0)

def compare_areas(self):
    """Return a score on how image areas are similar.

        :return: (float) value between 0. and 1.

        """
    area1 = self.__coords1.area()
    area2 = self.__coords2.area()
    min_area = min(area1, area2)
    max_area = max(area1, area2)
    if max_area < 2:
        return 0.0
    return float(min_area) / float(max_area)

def compare_sizes(self):
    """Return a score on how image sizes are similar.

        :return: (float) value between 0. and 1.

        """
    w_min = min(self.__coords1.w, self.__coords2.w)
    w_max = max(self.__coords1.w, self.__coords2.w)
    h_min = min(self.__coords1.h, self.__coords2.h)
    h_max = max(self.__coords1.h, self.__coords2.h)
    w_ratio = 0.0
    if w_max > 2:
        w_ratio = float(w_min) / float(w_max)
    h_ratio = 0.0
    if h_max > 2:
        h_ratio = float(h_min) / float(h_max)
    return (w_ratio + h_ratio) / 2.0