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# Copyright (c) OpenMMLab. All rights reserved.
import cv2
import numpy as np
from mmocr.utils.typing_utils import ArrayLike
def fill_hole(input_mask: ArrayLike) -> np.array:
"""Fill holes in matrix.
Input:
[[0, 0, 0, 0, 0, 0, 0],
[0, 1, 1, 1, 1, 1, 0],
[0, 1, 0, 0, 0, 1, 0],
[0, 1, 1, 1, 1, 1, 0],
[0, 0, 0, 0, 0, 0, 0]]
Output:
[[0, 0, 0, 0, 0, 0, 0],
[0, 1, 1, 1, 1, 1, 0],
[0, 1, 1, 1, 1, 1, 0],
[0, 1, 1, 1, 1, 1, 0],
[0, 0, 0, 0, 0, 0, 0]]
Args:
input_mask (ArrayLike): The input mask.
Returns:
np.array: The output mask that has been filled.
"""
input_mask = np.array(input_mask)
h, w = input_mask.shape
canvas = np.zeros((h + 2, w + 2), np.uint8)
canvas[1:h + 1, 1:w + 1] = input_mask.copy()
mask = np.zeros((h + 4, w + 4), np.uint8)
cv2.floodFill(canvas, mask, (0, 0), 1)
canvas = canvas[1:h + 1, 1:w + 1].astype(np.bool_)
return ~canvas | input_mask
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