sudo apt-get install libopencv-dev python-opencv

import numpy as np
import cv2
 
cap = cv2.VideoCapture(0)
 
while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()
 
    # Our operations on the frame come here
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
 
    # Display the resulting frame
    cv2.imshow('frame',gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
 
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

g++ -ggdb `pkg-config --cflags opencv` -o `basename opencvtest.cpp .cpp` opencvtest.cpp `pkg-config --libs opencv`

#include <opencv2/highgui/highgui.hpp>
using namespace cv;
 
int main()
{
    Mat img = imread("/home/alfred/Desktop/screen.jpg",CV_LOAD_IMAGE_COLOR);
    imshow("opencvtest",img);
    waitKey(0);
    return 0;
 }

You can capture images and obtain the properties:

cap = cv2.VideoCapture(0)
width, height = cap.get(cv2.cv.CV_CAP_PROP_FRAME_WIDTH), cap.get(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT)

VideoCapture properties in C++ are: CV_CAP_PROP_FRAME_WIDTH…