Bruitage d'image de Poisson

import cv2
import numpy as np
 
def poisson_noise_add(img):
 
    PEAK = 1
 
    noise_mask = np.random.poisson(img / 255.0 * PEAK) / PEAK * 255
 
    noisy = img + noise_mask
 
    return noisy
 
 
if  __name__ == "__main__":
 
    img = cv2.imread("Lenna.jpg")
 
    noisy_img = poisson_noise_add(img)
 
    cv2.imwrite("lena_poisson_noise.jpg", noisy_img)