close webcam in openCV python

Question

I want to close web cam i used the cap.released() but it does not close the web cam after it captures the image. Here is my code:

import cv2
import matplotlib.pyplot as plt
def main():
     cap=cv2.VideoCapture(0)
     if cap.isOpened():
             ret, frame = cap.read()
             print(ret)
             print(frame)
     else:
         ret=False
     img1=  cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
     plt.imshow(img1)
     plt.title('Color Image RGB')
     plt.xticks([])
     plt.yticks([])
     plt.show()
     cap.release() 
if __name__=='__main__':
     main() 

Solution

The cam will stay active until you close the figure, i.e. until the script finishes. This is because you only release the capture afterwards,

plt.show()
cap.release() 

If you want to turn off the camera after taking the image, reverse this order

cap.release() 
plt.show()

Comments

[Sembei Norimaki]

your main function is empty. You should fix this first

[Dan Mašek]

Please, make a proper minimal reproducible example -- fix the indentation, and remove anything irrelevant (e.g. what does matplotlib have to do with the issue?) Also, how do you know it's not released, when cap.release() appears to be the last statement in your example?

[Mohammad Arshad]

my webcam light is still on

[Hayat]

I can't see if statement. Also, check I code after else part is executing properly.

[ImportanceOfBeingErnest]

Please fix the code such that one can copy and paste it from the question and see the same result as you. Also state how you are running this code.

[Dan Mašek]

@MohammadArshad What version of OpenCV are you using? What platform?