OpenCV笔记1

所用头文件

#include <opencv2/opencv.hpp>
#include <iostream>
#include <fstream>

1. 显示图片

   void DrawImage() {
       string filepath = "/home/yang/Datasets/lfpw/testset/Path_Images.txt";
       ifstream fin;
       fin.open(filepath.c_str()); //string类型转为字符串类型
       string name;
       while (getline(fin, name)) {
           name.erase(0, name.find_first_not_of("  "));
           name.erase(name.find_last_not_of("  "));
           cv::Mat image = cv::imread(name, 1);//读取图片
           cv::Mat img_gray;
           cvtColor(image, img_gray, CV_BGR2GRAY);
           cv::imshow("result", image);//显示
           cv::waitKey(0);
       }
       fin.close();
   }

2. 播放视频

   void ShowAVI() {
       string filepath = "768x576.avi";
       CvCapture* capture = 0;
       IplImage* iplImg;
       cv::Mat frame, frameCopy;
       capture = cvCaptureFromAVI(filepath.c_str());
       if (!capture)
           cout << "Capture from AVI didn‘t work" << endl;
       while (1) {
           iplImg = cvQueryFrame(capture);
           frame = iplImg;
           if (frame.empty())
               break;
           cv::imshow("result", frame);
           if (cv::waitKey(33) >= 0)//按任意键推出waitKey返回所按键盘的ASCII码
               goto _cleanup_;
       }
       cv::waitKey(0);
       _cleanup_: cvReleaseCapture(&capture);
   }

3. 视频播放控制