Opencv learning notes 1 -- several methods of reading images

• cv2.IMREAD_COLOR Color images
• cv2.IMREAD_GRAYSCALE Grayscale image
• cv2.COLOR_BGR2RGB BGR turn RGB

import cv2
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
import numpy as np
from PIL import Image

1. cv Display the image in

image = cv2.imread('image.png')
def cv_show(name, image):
    cv2.imshow(name, image)
    cv2.waitKey(0)
    cv2.destroyAllWindows()
cv_show("cat", image)

2. cv2+plt Display the image in

image = cv2.imread('image.png')
plt.imshow(image)

because opencv The data read in is not RGB, It is BGR, So pass cv2 Try not to use other tools to display the read image , It can be done by cv2.COLOR_BGR2RGB To transform

image = cv2.imread('image.png')
image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
plt.imshow(image)

3.plt Display the image in

image = mpimg.imread('image.png')
plt.imshow(image)

4. Image Display the image in

image = Image.open('image.png')
image.show()