$ poetry run python HandTrackingMin.py
OpenCV: error in [AVCaptureDeviceInput initWithDevice:error:]
2021-05-02 18:59:21.855 python[6761:45627] OpenCV: Cannot use FaceTime HD Camera (Built-in)
OpenCV: camera failed to properly initialize!
None
Traceback (most recent call last):
File "HandTrackingMin.py", line 11, in <module>
cv2.imshow("image", img)
cv2.error: OpenCV(4.5.1) /private/var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/pip-req-build-oe0iat4a/opencv/modules/highgui/src/window.cpp:376: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'
The issue is that iTerm2 doesn't have a permission to access to the FaceTime HD Camera (Built-in).
System Preferences --> Security & Privacy --> Camera
System Preferences will show something like this.
What we need to do is to check iTerm2 then we can use FaceTime HD Camera (Built-in) with OpenCV.
Sample Code
import numpy as np
import cv2
# built-in camera
cap = cv2.VideoCapture(0)
while(True):
ret, frame = cap.read()
if frame is not None:
cv2.imshow("image", frame)
rval, frame = cap.read()
# gray image
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame', gray)
# when hit 'q', terminate the program
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
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