Live cam

Configuration of a live cam.

Next, we want to configure a live cam connected to the Raspberry. With a cam, there can be multiple applications:

• 24h live stream of whatever. Exposing a port in the local network should suffice.

• Take a picture at a certain point of the day and save it. Then, timelapse can be done.

source:

To use cv2:

• Create virtual environment python3 -m venv venv

• Activate it . venv/bin/activate

• Install cv2 pip install opencv-python

• Install extra libs required sudo apt-get install libatlas-base-dev

• Run following script

import cv2
import time

cap = cv2.VideoCapture(0)
ret, frame = cap.read()

def takePicture():
    (grabbed, frame) = cap.read()
    showimg = frame
    # cv2.imshow('img1', showimg)  # display the captured image
    cv2.waitKey(2000)
    #time.sleep(1) # Wait 300 miliseconds
    image = 'test-image.png'
    cv2.imwrite(image, frame)
    cap.release()
    return image

print(takePicture())

Play with waitKey(*) to let some seconds to focus light. Also, adjust cam.

https://github.com/opencv/opencv-python

https://raspberrypi-guide.github.io/electronics/using-usb-webcams

https://stackoverflow.com/questions/53347759/importerror-libcblas-so-3-cannot-open-shared-object-file-no-such-file-or-dire

https://gist.github.com/Luxato/384a7c8a6bfdeba09d54cb5bd6b2c9fb