How to show image from webcam
Question: I never needed to work with camera before, so I do not know where to start. I
need to display the image of a real-time camera, to capture and save to a
file. I'm using python3 and gtk3.

Does gtk has any feature for this?


Answer: The easiest way to get the image from a webcam is to use OpenCV. It allows you
to get the image with just 2 lines of code and 2 more to show it, like so:

    
    
    import numpy as np
    import cv2
    
    cap = cv2.VideoCapture(0)
    ret, frame = cap.read()
    
    cv2.imshow('frame',frame)
    cv2.waitKey(0)
    

But there is a downside, namely that OpenCV for Python 3 has to be build from
source. Most people don't like building from source so they say it is not
available.

Luckily there is the [Unofficial Windows Binaries for Python Extension
Packages by Gohlke (University of
California)](http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv) which also
offers a precompiled version of OpenCV for Python 3. Installing that using
`pip` should be easy.

