python图片-9-图像椒盐效果

打开图像并转化为矩阵，并显示

from PIL import Image
import numpy as np
import matplotlib.pyplot as plt
img=np.array(Image.open('pokemon.jpg'))  #打开图像并转化为数字矩阵
plt.figure("pokemon")
plt.imshow(img)
plt.axis('off')
plt.show()

打开图片，并随机添加一些椒盐噪声

from PIL import Image
import numpy as np
import matplotlib.pyplot as plt



img = np.array(Image.open('pokemon.jpg'))        #打开图片


rows,cols,dims =img.shape
print()
for i in range(5000):
    x = np.random.randint(0,rows)
    y = np.random.randint(0,cols)
    img[x,y,:] = 255
plt.figure('pokemon')                   #设置figure

plt.imshow(img)


plt.show()