Python uses OpenCV to read an example of a picture

Here's a small piece to bring you an example of Python using OpenCV to read pictures. Small series feel very good, now share to everyone, also for everyone to make a reference. Let's take a look at it with a little knitting.

After installing the environment, start the first Hello Word example, how to read the picture, save the artwork

Import CV2 Import NumPy as NP import Matplotlib.pyplot as PLT  #读取图片代码 img = cv2.imread (' test.jpg ', Cv2. Imread_grayscale) #IMREAD_COLOR = 1 #IMREAD_UNCHANGED = 1 #展示图片 cv2.imshow (' Image ', img) cv2.waitkey (0) Cv2.destroyallwindows () #使用matplotlib分析图片 #plt. Imshow (img,cmap= ' Gray ', interpolation= ' bicubic ') #plt. Plot ([50,100] , [80,100], ' C ', linewidth=5) #plt. Show () #把图片保存为png格式的灰色文件. Cv2.imwrite (' Testgray.png ', IMG)