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31 lines
746 B
Python
31 lines
746 B
Python
from PIL import Image
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"""
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Mean thresholding algorithm for image processing
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https://en.wikipedia.org/wiki/Thresholding_(image_processing)
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"""
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def mean_threshold(image: Image.Image) -> Image.Image:
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"""
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image: is a grayscale PIL image object
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"""
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height, width = image.size
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mean = 0
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pixels = image.load()
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for i in range(width):
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for j in range(height):
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pixel = pixels[j, i]
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mean += pixel
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mean //= width * height
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for j in range(width):
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for i in range(height):
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pixels[i, j] = 255 if pixels[i, j] > mean else 0
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return image
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if __name__ == "__main__":
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image = mean_threshold(Image.open("path_to_image").convert("L"))
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image.save("output_image_path")
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