visual-c++ - 如何在背景减法器模型中使用捕获的视频播放和检测对象？

Question

每个人。！我正在使用opencv2.4.2。实际上我正在做对象检测项目。我尝试使用 BackgroundSubtractorMOG 模型。但我无法从我的电脑加载视频文件。在实时运行时，下面的分段代码可以正常工作。我已经实现了使用帧差分方法进行对象检测。现在我想从背景中分割整个对象。我有静态背景。所以任何人都可以在下面的代码中帮助我如何从捕获的视频中分割对象。还如何加载视频文件？谢谢你。

•       #include "stdafx.h"
        #include "opencv2/imgproc/imgproc.hpp"
         #include "opencv2/highgui/highgui.hpp"
         #include "opencv2/contrib/contrib.hpp"
         #include "conio.h"
  
        #include "time.h"
        #include "opencv/cvaux.hpp"
        #include "opencv2/core/core.hpp"
        #include "opencv2/calib3d/calib3d.hpp"
  
        using namespace std;
        using namespace cv;
    int main(int argc, char** argv)
   {
  //IplImage* tmp_frame;
  //std::string arg = argv[1];
  //VideoCapture capture();
        cv::VideoCapture cap;
  
         /*CvCapture *cap =cvCaptureFromFile("S:\\offline object detection                 database\\SINGLE PERSON Database\\video4.avi");
        if(!cap){
          printf("Capture failure\n");
           return -1;
          }
  
          IplImage* frame=0;
          frame = cvQueryFrame(cap);           
           if(!frame)
  return -1;*/
  
  
  
       bool update_bg_model = true;
  
      if( argc < 2 )
      cap.open(0);
      else
      cap.open(std::string(argv[1]));
  
      if( !cap.isOpened() )
     {
      printf("can not open camera or video file\n");
      return -1;
     }
  
      Mat tmp_frame, bgmask;
  
      cap >> tmp_frame;
      if(!tmp_frame.data)
      {
  
  
      printf("can not read data from the video source\n");
      return -1;
      }
  
       namedWindow("video", 1);
      namedWindow("segmented", 1);
  
      BackgroundSubtractorMOG bgsubtractor;
  
      for(;;)
     {
      //double t = (double)cvGetTickCount();
      cap >> tmp_frame;
      if( !tmp_frame.data )
          break;
      bgsubtractor(tmp_frame, bgmask, update_bg_model ? -1 : 0);
      //t = (double)cvGetTickCount() - t;
      //printf( "%d. %.1f\n", fr, t/(cvGetTickFrequency()*1000.) );
      imshow("video", tmp_frame);
      imshow("segmented", bgmask);
      char keycode = waitKey(30);
      if( keycode == 27 ) break;
      if( keycode == ' ' )
          update_bg_model = !update_bg_model;
       }
  
        return 0;
       }
  

Answer 1

opencv 中的视频加载对我有用。要加载视频，您可以尝试这样的事情。捕获帧后，您可以在循环中进行处理，也可以调用单独的函数。

std::cout<<"Video File "<<argv[1]<<std::endl;

cv::VideoCapture input_video(argv[1]);

namedWindow("My_Win",1);

Mat cap_img;

while(input_video.grab())
{
   if(input_video.retrieve(cap_img))
   {
     imshow("My_Win", cap_img);
     /* Once you have the image do all the processing here */
     /* Or Call your image processing function */
     waitKey(1);

   }
}

或者你可以做点什么

int main(int argc, char*argv[])
{

    char *my_file = "C:\\vid_an2\\desp_me.avi";
    std::cout<<"Video File "<<my_file<<std::endl;
    cv::VideoCapture input_video;

    if(input_video.open(my_file))
    {
         std::cout<<"Video file open "<<std::endl;
    }
    else
    {
        std::cout<<"Not able to Video file open "<<std::endl;

    }
    namedWindow("My_Win",1);
    namedWindow("Segemented", 1);
    Mat cap_img;
    for(;;)
    {
         input_video >> cap_img;
         imshow("My_Win", cap_img);
          waitKey(0);
    }
   return 0;
 }