Python-2/computer_vision/mean_threshold.py at master · https-github-com-nzysoft/Python-2 · GitHub

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from PIL import Image

"""

Mean thresholding algorithm for image processing

https://en.wikipedia.org/wiki/Thresholding_(image_processing)

"""

def mean_threshold(image: Image) -> Image:

"""

image: is a grayscale PIL image object

"""

height, width = image.size

mean = 0

pixels = image.load()

for i in range(width):

for j in range(height):

pixel = pixels[j, i]

mean += pixel

mean //= width * height

for j in range(width):

for i in range(height):

pixels[i, j] = 255 if pixels[i, j] > mean else 0

return image

if __name__ == "__main__":

image = mean_threshold(Image.open("path_to_image").convert("L"))

image.save("output_image_path")

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