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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()

Main.java:1: error: '.' expected
import numpy as np
            ^
Main.java:1: error: ';' expected
import numpy as np
               ^
Main.java:2: error: '.' expected
import cv2
          ^
Main.java:4: error: ';' expected
cap = cv2.VideoCapture(0)
   ^
Main.java:7: error: illegal character: '#'
    # Capture frame-by-frame
    ^
Main.java:10: error: illegal character: '#'
    # Our operations on the frame come here
    ^
Main.java:13: error: illegal character: '#'
    # Display the resulting frame
    ^
Main.java:14: error: unclosed character literal
    cv2.imshow('frame',gray)
               ^
Main.java:14: error: unclosed character literal
    cv2.imshow('frame',gray)
                     ^
Main.java:18: error: illegal character: '#'
# When everything done, release the capture
^
10 errors

Standard output is empty