opencv open image code example

Example 1: how to save image opencv

cv2.imwrite('data/dst/lena_opencv_red.jpg', im)

Example 2: show image opencv python

import cv2
img = cv2.imread('/path_to_image/opencv-logo.png')
cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

# to use it in a loop
k = cv2.waitKey(0)
if k == 27:         # wait for ESC key to exit
    cv2.destroyAllWindows()
elif k == ord('s'): # wait for 's' key to save and exit
    cv2.imwrite('messigray.png',img)
    cv2.destroyAllWindows()

Example 3: cv show image python

cv2.imshow('image',img)
cv2.waitKey(0)

Example 4: opencv capture camera python

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()

    # Our operations on the frame come here
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    # Display the resulting frame
    cv2.imshow('frame',gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

Example 5: open opencv image file

cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

Example 6: opencv load image python

img = cv2.imread('filename.jpg',1)