【OpenCv应用笔记】基于OpenCv的视频截图C++程序

/**************************************************************************************************************************文件说明:         视频截图运行环境:         Win10+VS2013+OpenCv3时间地点:         陕西师范大学 文津楼 2017.8.5作     者:         九 月***************************************************************************************************************************/#include <opencv2/objdetect/objdetect.hpp>#include <opencv2/imgproc/imgproc.hpp>#include <opencv2/highgui/highgui.hpp>#include <opencv.hpp>#include <iostream>#include <vector>#include <stdio.h>using namespace cv;using namespace std;int process(VideoCapture& capture){int n = 0;char filename[200];string window_name = "video | q or esc to quit";std::cout << "按下【Space】空格键可以截图" << std::endl;std::cout <<"【Esc】和【q】键 - 退出程序"  << endl;namedWindow(window_name, CV_WINDOW_KEEPRATIO); //resizable window;cv::Mat frame;for (;;){capture >> frame;if (frame.empty())break;cv::Mat gray;cv::cvtColor(frame, gray, COLOR_RGB2GRAY);std::vector<string> codes;cv::Mat corners;cv::imshow(window_name, frame);char key = (char)waitKey(1); switch (key){case 'q':case 'Q':case 27:                                                 //[1]escape keyreturn 0;case ' ':                                                //[2]Save an imagesprintf(filename, "D:\\OpenCvDemo\\VideoScreen\\VideoScreen\\screenImg\\%.3d.png", n++);imwrite(filename, frame);cout << "\n\t>保存了 " << filename << "文件到工程目录下" << endl;break;default:break;}}return 0;}/**************************************************************************************************************************函数说明:        主函数功能描述:        控制台应用程序的入口函数，我们的程序从这里开始***************************************************************************************************************************/int main(int argc,char** argv){VideoCapture capture("D:\\MSR_original\\MSR_original\\Img\\03.mpeg"); //从文件载入视频//VideoCapture capture(0); //从摄像头载入视频if (!capture.isOpened()){std::cerr << "Failed to open a video device or video file!\n" << endl;return 1;}return process(capture);}