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Fix mypy errors in erosion_operation.py

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This commit is contained in:
Tianyi Zheng 2023-01-07 01:16:34 -08:00
parent 8b44f10376
commit d0ca630533
1 changed files with 7 additions and 8 deletions
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15
digital_image_processing/morphological_operations/erosion_operation.py
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@ -2,7 +2,7 @@ import numpy as np
from PIL import Image
def rgb2gray(rgb: np.array) -> np.array:
def rgb2gray(rgb: np.ndarray) -> np.ndarray:
"""
Return gray image from rgb image
>>> rgb2gray(np.array([[[127, 255, 0]]]))
@ -18,7 +18,7 @@ def rgb2gray(rgb: np.array) -> np.array:
return 0.2989 * r + 0.5870 * g + 0.1140 * b
def gray2binary(gray: np.array) -> np.array:
def gray2binary(gray: np.ndarray) -> np.ndarray:
"""
Return binary image from gray image
>>> gray2binary(np.array([[127, 255, 0]]))
@ -35,7 +35,7 @@ def gray2binary(gray: np.array) -> np.array:
return (127 < gray) & (gray <= 255)
def erosion(image: np.array, kernel: np.array) -> np.array:
def erosion(image: np.ndarray, kernel: np.ndarray) -> np.ndarray:
"""
Return eroded image
>>> erosion(np.array([[True, True, False]]), np.array([[0, 1, 0]]))
@ -61,14 +61,13 @@ def erosion(image: np.array, kernel: np.array) -> np.array:
return output
# kernel to be applied
structuring_element = np.array([[0, 1, 0], [1, 1, 1], [0, 1, 0]])
if __name__ == "__main__":
# read original image
image = np.array(Image.open(r"..\image_data\lena.jpg"))
lena = np.array(Image.open(r"..\image_data\lena.jpg"))
# kernel to be applied
structuring_element = np.array([[0, 1, 0], [1, 1, 1], [0, 1, 0]])
# Apply erosion operation to a binary image
output = erosion(gray2binary(rgb2gray(image)), structuring_element)
output = erosion(gray2binary(rgb2gray(lena)), structuring_element)
# Save the output image
pil_img = Image.fromarray(output).convert("RGB")
pil_img.save("result_erosion.png")