This my codes :
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()
I write the code like this and try to open my camera, but the camera image looks like the screenshot.
Stop working screen shot
Any idea ? What is the reason?
It's indentation problem.
Try this code:
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()
Provide proper indentation so the program works fine.
Press "q" to stop the program.
Related
i am trying to learn some image processing using openCV and i wrote a basic code but the "frame" windows won't show.I've tried installing on a separate computer but i get the same problem.
import cv2
cap = cv2.VideoCapture(0);
while (True):
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame', gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
Based on the code you added your if statement is outside the while loop and therefore can never be checked. It should have thrown a different error however if that was the case. Your camera might be detected but not working. Try using it like a traditional webcam on another program like camera or photobooth to help troubleshoot the issue.
import cv2
cap = cv2.VideoCapture(0);
while (True):
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame', gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
import numpy as np
import cv2
#holder for the camera object
cap = cv2.VideoCapture(0)
while(True):
# Capture frame-by-frame
ret, frame = cap.read()
# Our operations on the frame come here (color)
color = cv2.cvtColor(frame, 1)
# Display the frame
cv2.imshow('LiveCam',color)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
'''When everything done, release the capture'''
cap.release()
cv2.destroyAllWindows()
This code will display my own live frames on my own screen.
I want to send my live frames to another computer,and to receive the other's computer own live in order to display it.
Can I get some help please?
Here is the code for reading video file from webcam using opencv website. I just want to process the frame every second.
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()
How should I modify the code:
You should just make your process wait for one second before each read:
import numpy as np
import cv2
import time
cap = cv2.VideoCapture(0)
while(True):
# Capture frame-by-frame
start_time = time.time()
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
time.sleep(1.0 - time.time() + start_time) # Sleep for 1 second minus elapsed time
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()
When I try to run the following code:
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',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()
I receive the message: Floating point exception
Where is my mistake?
I'm programing in python and opencv on Ubuntu but the cv2.destoyAllWindows() doesn't seem to work,as in this example:
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()
when i press 'q' the program end but the window remain on the screen how ever on windows i didn't face such thing
any help I will be thankful