View images in OpenCV from Python using an external USB camera on your MacBook
Overview
I used a USB-connected camera instead of the built-in camera (FaceTime HD Camera) on my MacBook Pro to get the camera image from Python and display it.
Trigger
I tried connecting a USB camera on my MacBook, but it didn't work smoothly. It seems that it can be solved by using software called CamTwist. And you need to keep CamTwist running.
environment
- macOS 10.14
- MacBook Pro 13
- Python 3.7
- CamTwist 3.4.3
Get camera image
If you want to get the built-in camera image, you can display it with this script.
camera.py
import cv2
cap = cv2.VideoCapture(0)
while True:
ret, frame = cap.read()
cv2.imshow('camera', frame)
if cv2.waitKey(1)==27: #Exit with ESC
break
cap.release()
cv2.destroyAllWindows()
Install CamTwist
http://camtwiststudio.com/ Download dmg and launch pkg (installer) to get the .app file.
Go to webcam-> AppleScript-> Webcam and change "FaceTime HD Camera" to "USB_Camera # ~".
With CamTwist running, change the device ID of VideoCapture to 1 ~ and start it. I got it in 2 when I ran it.
camera.py
import cv2
cap = cv2.VideoCapture(2)
while True:
ret, frame = cap.read()
cv2.imshow('camera', frame)
if cv2.waitKey(1)==27: #Exit with ESC
break
cap.release()
cv2.destroyAllWindows()
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