def find_max_contour(threshed_image, filter_func = None,
accuracy_percent_with_perimeter=0.0001):
contours = Image.find_contours(
threshed_image, filter_func, accuracy_percent_with_perimeter)
# from picture_sudoku.cv2_helpers.display import Display
# Display.contours(threshed_image, contours)
if len(contours) == 0:
return None
contour_area_arr = [cv2.contourArea(i) for i in contours]
max_contour = contours[contour_area_arr.index(max(contour_area_arr))]
return max_contour
