To process a video sequence, we should be able to read each frame. OpenCV has developed an easy-to-use framework that can work with video files and camera input.
The following code is a videoCamera example that works with a video captured from a video camera. This example is a modification of an example in Chapter 1, Getting Started, and we will use it as the basic structure for other examples in this chapter:
#include "opencv2/opencv.hpp" using namespace std; using namespace cv; int videoCamera() { //1-Open the video camera VideoCapture capture(0); //Check if video camera is opened if(!capture.isOpened()) return 1; bool finish = false; Mat frame; Mat prev_frame; namedWindow("Video Camera"); if(!capture.read(prev_frame)) return 1; //Convert to gray image cvtColor(prev_frame,prev_frame,COLOR_BGR2GRAY); while(!finish) { //2-Read each frame, if possible if(!capture.read(frame)) return 1; ...