工程描述

1. opencv2.4.8
2. QT5

背景建模后，当有异物入侵时，把入侵的帧写到视频文件

使用BackgroundSubtractorMOG2背景建模

程序基于QT对话框

.pro

#-------------------------------------------------## Project created by QtCreator 2014-06-19T16:00:40 ##-------------------------------------------------QT       += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsTARGET = opencvqtTEMPLATE = appINCLUDEPATH += f:/opencv/build/include/opencvINCLUDEPATH += f:/opencv/build/include/opencv2INCLUDEPATH += f:/opencv/build/includeLIBS += -Lf:/opencv/build/x86/vc11/lib \    -lopencv_core248d \    -lopencv_highgui248d \    -lopencv_imgproc248d \    -lopencv_features2d248d \    -lopencv_calib3d248d \    -lopencv_contrib248d \    -lopencv_flann248d \    -lopencv_gpu248d \    -lopencv_legacy248d \    -lopencv_ml248d \    -lopencv_nonfree248d \    -lopencv_objdetect248d \    -lopencv_ocl248d \    -lopencv_photo248d \    -lopencv_stitching248d \    -lopencv_superres248d \    -lopencv_ts248d \    -lopencv_video248d \    -lopencv_videostab248dSOURCES += main.cpp\        dialog.cppHEADERS  += dialog.hFORMS    += dialog.uiRESOURCES += \    img.qrc

dialog.h

#ifndef DIALOG_H#define DIALOG_H#include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           #include 
           
            using namespace cv;namespace Ui {class Dialog;}class Dialog : public QDialog{ Q_OBJECTpublic: explicit Dialog(QWidget *parent = 0); ~Dialog(); void initwebcam(); void initBackgroundSubtractorMOG2(); Mat frame ;private slots: void getFrame(); //实现定时从摄像头取图并显示在label上的功能。private: VideoCapture cap; //highgui 里提供的一个专门处理摄像头图像的结构体 cv::BackgroundSubtractorMOG2 bg; VideoWriter writer; //摄像头每次抓取的图像为一帧，使用该指针指向一帧图像的内存空间 Size videoSize; Ui::Dialog *ui; QTimer *timer; /* 定时器，更新界面 */};#endif // DIALOG_H
           
          
         
        
       
      
     

dialog.cpp

#include "dialog.h"#include "ui_dialog.h"static bool recodeflag=false;static cv::Mat frame;static cv::Mat back;static cv::Mat fore;static Mat copyimg;static std::vector
     
      
        > contours;static int count=0;Dialog::Dialog(QWidget *parent) :    QDialog(parent),    ui(new Ui::Dialog){    ui->setupUi(this);    timer = new QTimer(this);    initwebcam();    initBackgroundSubtractorMOG2();    connect(timer,SIGNAL(timeout()),this,SLOT(getFrame())); //超时就去取    timer->start(5); //1000为1秒，10毫秒去取一帧}Dialog::~Dialog(){    timer->stop(); //停止取帧    delete ui;}void Dialog::initwebcam(){    cap=VideoCapture(0);    if(!cap.isOpened()){        qDebug()<<"init webcam  error ,program exit...";        return;    }    cap.set(CV_CAP_PROP_FRAME_WIDTH, 320);      /* set width */    cap.set(CV_CAP_PROP_FRAME_HEIGHT, 240);     /* set height */    videoSize=Size(320,240);}void Dialog::initBackgroundSubtractorMOG2(){    bg.setInt("nmixtures", 3);    bg.setBool("detectShadows", false);    writer.open("result.avi",CV_FOURCC('D','I','V','X'),15,videoSize);}void Dialog::getFrame(){     //从摄像头取帧//    static  QPixmap pixmapObject(":/image/webcam.png");//    ui->label_3->setPixmap(pixmapObject);    cap>>frame;    frame.copyTo(copyimg);    QImage image = QImage((const uchar*)frame.data, frame.cols, frame.rows, QImage::Format_RGB888).rgbSwapped(); //简单地转换一下为Image对象，rgbSwapped是为了显示效果色彩好一些。    ui->label->setPixmap(QPixmap::fromImage(image));    bg.operator ()(frame,fore);    bg.getBackgroundImage(back);    cv::erode(fore,fore,cv::Mat());    cv::dilate(fore,fore,cv::Mat());    cv::findContours(fore,contours,CV_RETR_EXTERNAL,CV_CHAIN_APPROX_NONE);    if (contours.size()>0 &&count>0)            {                //如果轮廓的面积太小了也不用写到输出视频                for (int i = 0; i< contours.size(); i++)                {                    double a=contourArea( contours[i],false);                    if (a>500)//面积小于1000                    {                        cv::drawContours(frame,contours,i,cv::Scalar(0,0,255),2);                        recodeflag=true;                    }                    else                    {                        recodeflag=false;                    }                }            }            else            {                recodeflag=false;            }    if(recodeflag){        QImage imagelable2 = QImage((const uchar*)frame.data, frame.cols, frame.rows, QImage::Format_RGB888).rgbSwapped();        ui->label_2->setPixmap(QPixmap::fromImage(imagelable2));    }else {        //static  QPixmap pixmapObject(":/image/webcam.png");       // ui->label_2->setPixmap(pixmapObject);        ui->label_2->setText("
       
        
         NOTHING
        
");    }    if (recodeflag)        {            //std::string outfile(cv::format("%d.jpg",imagecount));            //writer<
      
     

效果图

背景建模

 

异物入侵

生成异物入侵的视频文件