python遍历图片进行数据预处理的几种办法——边缘检测，反色，旋转，灰度等

1.Canny边缘检测

import cv2
from PIL import Image
import numpy
import numpy as np
for i in range(1,30):
    img = Image.open("D:\\zy\\{}.jpg".format(i))
    img2 = cv2.cvtColor(np.array(img),cv2.COLOR_RGB2BGR)
    dst=cv2.Canny(img2,50,50)
    img3 = Image.fromarray(dst) 
    img3.save("D:\\new6\\{}.png".format(i))
    

效果图如下：

2.反色

import cv2
from PIL import Image
import numpy
import numpy as np
for