I want to grab live images from a camera which is connected via USB with my computer.
I am using an Industrial Camera with usb port.
At device manager the camera is shown with its name and id so I think it is connected to PC.
I ran a 'findcam' program but it is not showing any existance of camera
import cv2
cap = cv2.VideoCapture(0)
while True:
ret, frame = cap.read()
cv2.imshow('Live Video', frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
The given code which i tried is running for webcam on my laptop but when the same code i run on my PC with an external camera.
it constantly showing an error.
The Error:
Traceback (most recent call last):
File "C:/Users/Admin/PycharmProjects/industrialcamera/ICvideocapture.py", line 11, in <module>
cv2.imshow('Live Video', frame)
cv2.error: OpenCV(4.1.0) C:\projects\opencv-python\opencv\modules\highgui\src\window.cpp:352: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'
I tried changing Index -1, 0, 1 but the error is constant
please help to find, weather it is my PC problem or camera problem or is their is any other way to stream(in python)
Thank You
I started your code on my PC and it works fine. Try to set the camera resolution manually, if you have an error with size.width
and size.height
, something like this:
cap = cv2.VideoCapture(0)
cap.set(3,1280)
cap.set(4,920)
You may have installed the wrong version of OpenCV which doesn't support video. Uninstall everything of opencv and then run:
pip install opencv-python
(Source: cv2.VideoCapture.open() always returns FALSE )
尝试通过 pip 安装opencv-contrib-python
: pip install opencv-contrib-python
或者尝试升级它的版本: pip install opencv-python --upgrade
you can debugg by checking the ret value:
import cv2
cap = cv2.VideoCapture(0)
counter = 0
while True:.
ret, frame = cap.read()
if ret :
cv2.imshow('Live Video', frame)
print(f" frame {counter} : ok ")
if not ret :
print(f" frame {counter} : ...")
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
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