高斯噪声未覆盖主图像-Python

Question

我正在尝试向图像添加高斯噪声（“pepper.jpg”）。它有效，如结果所示（“noisy Pepper.png”）；但噪音并没有覆盖“辣椒”，它就在它周围。我在应用噪音时缺少什么吗？任何意见，将不胜感激。import cv2import numpy as npimg = cv2.imread("pepper.jpg",0)row, col = img.shapemean = 0var = 0.3sigma = var ** 0.5gauss = np.random.normal(mean, sigma, (row, col))gauss = gauss.reshape(row, col)noisyp = gauss + imgnoisyp = noisyp.astype('uint8')cv2.imwrite('noisy pepper.png', noisyp)

Answer 1

您转换为uint8并不复杂。这是您要寻找的内容：

import cv2

import numpy as np

def convert_to_uint8(image_in):

    temp_image = np.float64(np.copy(image_in))

    cv2.normalize(temp_image, temp_image, 0, 255, cv2.NORM_MINMAX, dtype=-1)

    return temp_image.astype(np.uint8)

img = cv2.imread("pepper.jpg", 0)

row, col = img.shape

mean = 0

var = 0.3

sigma = var ** 0.5

gauss = np.random.normal(mean, sigma, (row, col))

gauss = gauss.reshape(row, col)

noisy_pepper = gauss + img

cv2.imwrite('noisy pepper.png', convert_to_uint8(noisy_pepper))

当然，巫婆这样的西格玛你是不会看到噪音的。请看一下这个（sigma 将在 14 左右）：

..

var = 200

sigma = var ** 0.5

..