給圖像加噪聲（椒鹽噪聲）

原理：隨機的將圖像某些像素值改為0或255

添加椒鹽噪聲

def SaltAndPepper(src,percetage):
    SP_NoiseImg=src
    SP_NoiseNum=int(percetage*src.shape[0]*src.shape[1])
    for i in range(SP_NoiseNum):
        randX=random.random_integers(0,src.shape[0]-1)
        randY=random.random_integers(0,src.shape[1]-1)
        if random.random_integers(0,1)==0:
            SP_NoiseImg[randX,randY]=0
        else:
            SP_NoiseImg[randX,randY]=255
img=cv2.imread(r"C:\Users\Jimmy\Desktop\ceshi1.jpg")
cv2.imshow("input",img)
percetage=0.1
SaltAndPepper(img,percetage)
cv2.imshow("salt",img)
cv2.waitKey(0)