opencv在视频中绘制直线与点

使用opencv读取视频并在视频画线画点

#include<iostream>
#include<opencv2\opencv.hpp>
#include <opencv2\dnn.hpp>

using namespace cv;
using namespace std;

void main(){
	VideoCapture cap;
	cap.open("2.MP4");
	
	int width = cap.get(CV_CAP_PROP_FRAME_WIDTH);
	int height = cap.get(CV_CAP_PROP_FRAME_HEIGHT);
	int frameRate = cap.get(CV_CAP_PROP_FPS);//帧率
	int totalFrames = cap.get(CV_CAP_PROP_FRAME_COUNT);//总帧数

	cout << "视频宽度=" << width << endl;
	cout << "视频高度=" << height << endl;
	cout << "视频总帧数=" << totalFrames << endl;
	cout << "帧率=" << frameRate << endl;

初始定义

		cap >> frame;
		cv::Point point;
		point.x = width / 2;
		point.y = height / 2;
		cv::circle(frame, point, 2, cv::Scalar(0, 0, 255));

点的绘制

		cv::Point start = cv::Point(width / 2 - 100,height/2);
		cv::Point end = cv::Point(width / 2 + 100, height / 2);
		cv::line(frame, start, end, cv::Scalar(0, 0, 255));

		cv::Point start1 = cv::Point(width / 2, height / 2-100);
		cv::Point end1 = cv::Point(width / 2, height / 2+100);
		cv::line(frame, start1, end1, cv::Scalar(0, 0, 255));

直线绘制

		if (frame.empty())
		{
			break;
		}

		imshow("video", frame);
		waitKey(30);

显示