利用OpenCV给图像添加标注

本程序使用范围：为运动目标跟踪提供ground truth【真实数据】，然后你可以进行各种跟踪算法误差对比

这是写论文的好帮手哦！

内容转自：http://blog.csdn.NET/xiaowei_cqu，是个妹子

我在她代码上稍微改进了下。

代码如下：

 // pic_label.cpp : 定义控制台应用程序的入口点。
 //

 #include "stdafx.h"
 #include "cv.h"
 #include "highgui.h"
 #include
 #include
 #include
 #include
 using namespace std;

 //全局变量
 bool is_drawing=false;
 vector biaozhu_boxs;
 CvRect drawing_box;
 IplImage *img,*img1;


 static void help();
 static void onMouse( int event, int x, int y, int, void* );

 int _tmain(int argc, _TCHAR* argv[])
 {
     CvFont font;
     CvScalar scalar;
     char text[10];

     // 初始化字体
     double hScale=1;
     double vScale=1;
     int lineWidth=3;// 相当于写字的线条
     scalar=CV_RGB(255,0,0);
     cvInitFont(&font,CV_FONT_HERSHEY_SIMPLEX|CV_FONT_ITALIC, hScale,vScale,0,lineWidth);//初始化字体，准备写到图片上的

     int frame_counter = 0;
     int obj_id = 0;

     CvCapture *capture=cvCreateFileCapture("a.avi");
     img = cvQueryFrame(capture);
     img1 = cvCreateImage(cvSize(img->width,img->height),IPL_DEPTH_8U,3);
     cvCopy(img,img1);

     ofstream outfile("a.txt");
     help();

     for(vector::iterator it=biaozhu_boxs.begin();it!=biaozhu_boxs.end();++it)
     {
         cvRectangle(img1,cvPoint((*it).x,(*it).y),cvPoint((*it).x + (*it).width,(*it).y + (*it).height),CV_RGB(0,255,0));
     }
     cvShowImage("video",img);

     cvSetMouseCallback( "video", onMouse, 0 );

     while (1)
     {
         int c=cvWaitKey(0);
         if( (c & 255) == 27 )
         {
             cout << "Exiting ...\n";
             break;
         }

         switch((char)c)
         {
         case 'n':
             //read the next frame
             ++frame_counter;
             img = cvQueryFrame(capture);
             cvCopy(img,img1);
             if(!img){
                 cout<<"\nVideo Finished!"<
                 return 0;
             }

             //save all of the labeling rects
             for(vector::iterator it=biaozhu_boxs.begin();it!=biaozhu_boxs.end();++it)
             {
                 cvRectangle(img1,cvPoint((*it).x,(*it).y),cvPoint((*it).x + (*it).width,(*it).y + (*it).height),CV_RGB(0,255,0));
                 itoa(obj_id,text,10);
                 cvPutText(img1,text,cvPoint((*it).x,(*it).y),&font,CV_RGB(255,255,255));//在图片中输出字符
                 outfile<" "<" "<<(*it).x<<" "
                     <<(*it).y<<" "<<(*it).width<<" "
                     <<(*it).height<
                 obj_id++;
             }
             obj_id = 0;
             break;
         case 'c':
             //clear all the rects on the image
             biaozhu_boxs.clear();
             cvCopy(img,img1);
         }
         cvShowImage("video",img1);
     }

     cvNamedWindow("video",0);
     cvReleaseCapture(&capture);
     cvDestroyWindow("video");
     return 0;
 }

 static void help()
 {
     cout << "This program designed for labeling video \n"
         <<"Coded by L. Wei on 9/4/2013\n"<

     cout<<"Use the mouse to draw rectangle on the image for labeling.\n"<

     cout << "Hot keys: \n"
         "\tESC - quit the program\n"
         "\tn - next frame of the video\n"
         "\tc - clear all the labels\n"
         <
 }

 static void onMouse( int event, int x, int y, int, void* )
 {
     switch(event)
     {
     case CV_EVENT_LBUTTONDOWN:
         //the left up point of the rect
         is_drawing=true;
         drawing_box.x=x;
         drawing_box.y=y;
         break;
     case CV_EVENT_MOUSEMOVE:
         //adjust the rect (use color blue for moving)
         if(is_drawing){
             drawing_box.width=x-drawing_box.x;
             drawing_box.height=y-drawing_box.y;
             cvCopy(img,img1);
             for(vector::iterator it=biaozhu_boxs.begin();it!=biaozhu_boxs.end();++it)
             {
                 cvRectangle(img1,cvPoint((*it).x,(*it).y),cvPoint((*it).x + (*it).width,(*it).y + (*it).height),CV_RGB(0,255,0));
             }
             cvRectangle(img1,cvPoint(drawing_box.x,drawing_box.y),cvPoint(drawing_box.x+drawing_box.width,drawing_box.y+drawing_box.height),CV_RGB(255,0,0));
         }
         break;
     case CV_EVENT_LBUTTONUP:
         //finish drawing the rect (use color green for finish)
         if(is_drawing){
             drawing_box.width=x-drawing_box.x;
             drawing_box.height=y-drawing_box.y;
             cvCopy(img,img1);
             for(vector::iterator it=biaozhu_boxs.begin();
                 it!=biaozhu_boxs.end();++it){
                     cvRectangle(img1,cvPoint((*it).x,(*it).y),cvPoint((*it).x + (*it).width,(*it).y + (*it).height),CV_RGB(0,255,0));
             }
             cvRectangle(img1,cvPoint(drawing_box.x,drawing_box.y),cvPoint(drawing_box.x+drawing_box.width,drawing_box.y+drawing_box.height),CV_RGB(255,0,0));
             biaozhu_boxs.push_back(drawing_box);
         }
         is_drawing=false;
         break;
     }
     cvShowImage("video",img1);
     return;
 }

功能及用法：

1.鼠标框定目标【可多个】

2.按n，进入下一帧，保存当前框定目标坐标到txt文本【可多个】

3.按c，清除当前帧所有已标定区域【人总有犯错的时候】或者上一帧遗留的区域

文件保存格式：

帧编号 目标编号  矩形左上角坐标 矩形右下角坐标

图片如下：

接下来，就用Matlab尽情的画折线图吧！！吼吼！