1、概述
案例:使用BackgroundSubstractor实现视频中移动对象统计
实现步骤:
1.实例化VideoCapture
2.创建BackgroundSubstractor
3.while循环读取视频帧
4.使用BS->apply获取mask
5.对mask进行二值化及形态学操作
6.使用findContours执行轮廓发现
7.统计最大外接矩形
8.输出结果
ps:这个算法的抗干扰能力比较差,要相出正确的结果,必须要对frame进行预处理。或者提升视频的质量才行。不然只能得到一个错误的结果
2、代码示例
Move_Video_Object_Tracking::Move_Video_Object_Tracking(QWidget *parent)
: MyGraphicsView{parent}
{
this->setWindowTitle("视频中移动对象统计");
QPushButton *btn = new QPushButton(this);
btn->setText("选择视频");
connect(btn,&QPushButton::clicked,[=](){
choiceVideo();
});
}
void Move_Video_Object_Tracking::choiceVideo(){
path = QFileDialog::getOpenFileName(this,"请选择视频","/Users/yangwei/Downloads/",tr("Image Files(*.mp4 *.avi)"));
qDebug()<<"视频路径:"<<path;
showMoveVideoObjectTracking(path.toStdString().c_str());
}
void Move_Video_Object_Tracking::showMoveVideoObjectTracking(const char* filePath){
VideoCapture capture;
capture.open(filePath);
if(!capture.isOpened()){
qDebug()<<"无法加载视频文件";
return;
}
Ptr<BackgroundSubtractor> mogSubstractor = createBackgroundSubtractorMOG2();
Mat frame,gauss,mask;
Mat kernel = getStructuringElement(MORPH_RECT,Size(3,3));
int count=0;
char text[8];
while(capture.read(frame)){
GaussianBlur(frame,gauss,Size(5,5),0,0);
mogSubstractor->apply(gauss,mask);//获取mask
threshold(mask,mask,0,255,THRESH_BINARY|cv::THRESH_OTSU);
//执行形态学操作
morphologyEx(mask,mask,MORPH_OPEN,kernel);
dilate(mask,mask,kernel,Point(-1,-1));
imshow("mask",mask);
//找到最大轮廓定位外接矩形
vector<vector<Point>> contours;
vector<Vec4i> heri;
//寻找最大外接矩形
findContours(mask,contours,RETR_EXTERNAL,CHAIN_APPROX_SIMPLE);
count = 0;
for(size_t i = 0;i<contours.size();i++){
double area = contourArea(contours[i]);
if(area<5000){
continue;
}
Rect rect = boundingRect(contours[i]);
qDebug()<<rect.width<<":"<<rect.height;
if (rect.width < 200 || rect.height < 100) continue;
count++;
rectangle(frame,rect,Scalar(0,0,255),3,8);
sprintf(text,"%d",count);
putText(frame,text,Point(rect.x+rect.width/2,rect.y+rect.height/2),FONT_ITALIC, FONT_HERSHEY_PLAIN,Scalar(0,255,0),2,8);
}
imshow("frame",frame);
int c = waitKey(1);
if(c==27){
break;
}
}
capture.release();
}
3、演示图片
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