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Fix mypy errors in erosion_operation.py (#8603)

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* updating DIRECTORY.md

* Fix mypy errors in erosion_operation.py

* Rename functions to use snake case

* updating DIRECTORY.md

* updating DIRECTORY.md

* Replace raw file string with pathlib Path

* Fix function name in erosion_operation.py doctest

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Tianyi Zheng 2023-09-27 08:00:34 -04:00 committed by GitHub
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commit 5830b29e7e
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1 changed files with 23 additions and 16 deletions
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39
digital_image_processing/morphological_operations/erosion_operation.py
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@ -1,34 +1,37 @@
from pathlib import Path
import numpy as np
from PIL import Image
def rgb2gray(rgb: np.array) -> np.array:
def rgb_to_gray(rgb: np.ndarray) -> np.ndarray:
"""
Return gray image from rgb image
>>> rgb2gray(np.array([[[127, 255, 0]]]))
>>> rgb_to_gray(np.array([[[127, 255, 0]]]))
array([[187.6453]])
>>> rgb2gray(np.array([[[0, 0, 0]]]))
>>> rgb_to_gray(np.array([[[0, 0, 0]]]))
array([[0.]])
>>> rgb2gray(np.array([[[2, 4, 1]]]))
>>> rgb_to_gray(np.array([[[2, 4, 1]]]))
array([[3.0598]])
>>> rgb2gray(np.array([[[26, 255, 14], [5, 147, 20], [1, 200, 0]]]))
>>> rgb_to_gray(np.array([[[26, 255, 14], [5, 147, 20], [1, 200, 0]]]))
array([[159.0524, 90.0635, 117.6989]])
"""
r, g, b = rgb[:, :, 0], rgb[:, :, 1], rgb[:, :, 2]
return 0.2989 * r + 0.5870 * g + 0.1140 * b
def gray2binary(gray: np.array) -> np.array:
def gray_to_binary(gray: np.ndarray) -> np.ndarray:
"""
Return binary image from gray image
>>> gray2binary(np.array([[127, 255, 0]]))
>>> gray_to_binary(np.array([[127, 255, 0]]))
array([[False, True, False]])
>>> gray2binary(np.array([[0]]))
>>> gray_to_binary(np.array([[0]]))
array([[False]])
>>> gray2binary(np.array([[26.2409, 4.9315, 1.4729]]))
>>> gray_to_binary(np.array([[26.2409, 4.9315, 1.4729]]))
array([[False, False, False]])
>>> gray2binary(np.array([[26, 255, 14], [5, 147, 20], [1, 200, 0]]))
>>> gray_to_binary(np.array([[26, 255, 14], [5, 147, 20], [1, 200, 0]]))
array([[False, True, False],
[False, True, False],
[False, True, False]])
@ -36,9 +39,10 @@ def gray2binary(gray: np.array) -> np.array:
return (gray > 127) & (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]]))
array([[False, False, False]])
>>> erosion(np.array([[True, False, False]]), np.array([[1, 1, 0]]))
@ -62,14 +66,17 @@ 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_path = Path(__file__).resolve().parent / "image_data" / "lena.jpg"
lena = np.array(Image.open(lena_path))
# 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(gray_to_binary(rgb_to_gray(lena)), structuring_element)
# Save the output image
pil_img = Image.fromarray(output).convert("RGB")
pil_img.save("result_erosion.png")