mean_threshold.py

fromPILimportImage

"""
Mean thresholding algorithm for image processing
https://en.wikipedia.org/wiki/Thresholding_(image_processing)
"""


defmean_threshold(image: Image) ->Image:
"""
 image: is a grayscale PIL image object
 """
height, width=image.size
mean=0
pixels=image.load()
foriinrange(width):
forjinrange(height):
pixel=pixels[j, i]
mean+=pixel
mean//=width*height

forjinrange(width):
foriinrange(height):
pixels[i, j] =255ifpixels[i, j] >meanelse0
returnimage


if__name__=="__main__":
image=mean_threshold(Image.open("path_to_image").convert("L"))
image.save("output_image_path")