之前一直用师兄写的标注工具，很多操作感觉不太习惯。又没有源码可改，索性自己写了一个，功能比较简单。就是视频的读取和标注。
主要用鼠标的点击进行标注，第一次点击为标注框左上角的点，可以按住左键调整标注框；松开时会确定标注框（框由蓝色变为绿色）；一帧中可以标注多个视频。
主要通过OpenCV的鼠标响应函数来实现：
void setMouseCallback(const string& winname, MouseCallback onMouse, void* userdata=0 );响应鼠标操作的onMouse函数如下：
static void onMouse( int event, int x, int y, int, void* ){switch(event){case CV_EVENT_LBUTTONDOWN: //the left up point of the rectis_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;img_original.copyTo(img_drawing);for(vector<Rect>::iterator it=biaozhu_boxs.begin();it!=biaozhu_boxs.end();++it){rectangle(img_drawing,(*it),Scalar(0,255,0));}rectangle(img_drawing,drawing_box,Scalar(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;img_original.copyTo(img_drawing);for(vector<Rect>::iterator it=biaozhu_boxs.begin();it!=biaozhu_boxs.end();++it){rectangle(img_drawing,(*it),Scalar(0,255,0));}rectangle(img_drawing,drawing_box,Scalar(0,255,0));biaozhu_boxs.push_back(drawing_box);}is_drawing=false;break;}imshow("Video",img_drawing);return;}
另外通过键盘实现一些按键的响应：（Esc）退出；（n）下一帧；（z）撤销最近一次标注；（c）清除当前帧已有的标注框
具体用waitKey()函数实现：
while(1){int c=waitKey(0);if( (c & 255) == 27 ){cout << "Exiting ...\n";break;}switch((char)c){case 'n'://read the next frame++frame_counter;capture>>img_original;if(img_original.empty()){cout<<"\nVideo Finished!"<<endl;return 0;}img_original.copyTo(img_drawing);//save all of the labeling rectsfor(vector<Rect>::iterator it=biaozhu_boxs.begin();it!=biaozhu_boxs.end();++it){rectangle(img_drawing,(*it),Scalar(0,255,0));outfile<<frame_counter<<" "<<(*it).x<<" "<<(*it).y<<" "<<(*it).width<<" "<<(*it).height<<endl;}break;case 'z'://undo the latest labelingif(!biaozhu_boxs.empty()){vector<Rect>::iterator it_end=biaozhu_boxs.end();--it_end;biaozhu_boxs.erase(it_end);}img_original.copyTo(img_drawing);for(vector<Rect>::iterator it=biaozhu_boxs.begin();it!=biaozhu_boxs.end();++it){rectangle(img_drawing,(*it),Scalar(0,255,0));}break;case 'c'://clear all the rects on the imagebiaozhu_boxs.clear();img_original.copyTo(img_drawing);}imshow("Video",img_drawing);}
标注信息输出在txt中，包括帧号、标注框左上角的x，y坐标以及宽、高
全部代码下载：http://www.pudn.com/downloads529/sourcecode/graph/opencv/detail2193351.html
http://download.csdn.net/detail/xiaowei_cqu/5238931