opencv 鼠标响应 实现在视频中画矩形框 指定跟踪目标为后续跟踪打下基础

#include <stdio.h> #include <cv.h> #include <cxcore.h> #include <highgui.h> #include <iostream> #include <vector> using namespace std; CvPoint prev_pt; CvPoint pt; vector <CvPoint> vec;//存放snake能量曲线的点集 IplImage* pFrame = NULL; void DrawRectangle() { cvRectangle(pFrame, prev_pt, pt, CV_RGB(255, 0 ,0), 1, 8, 0); cvShowImage("video", pFrame); } void on_mouse(int event, int w, int v, int flags, void* chu) { if( !pFrame ) return; if( event == CV_EVENT_LBUTTONDOWN ) { vec.clear();//每次重新画矩形前vec清空，这样画出一个新的矩形(以前的矩形自动消失) prev_pt.x = w; prev_pt.y = v; } else if( event == CV_EVENT_LBUTTONUP ) { pt.x = w; //pt.y = pFrame->height-v; pt.y =v; DrawRectangle(); } } int main() { CvCapture* pCapture = NULL; long int num = 0; cvNamedWindow("video", 1); //打开视频文件,cvCaptureFromFile初始化从文件中获取视频 if( !(pCapture = cvCaptureFromFile("test.avi")) ) { fprintf(stderr, "Can not open video file!\n"); return -1; } //逐帧读取视频,cvQueryFrame是从摄像头或者文件中抓取并返回一帧 while (pFrame = cvQueryFrame(pCapture)) { num++; //显示图像 cvSetMouseCallback( "video", on_mouse, 0 ); cvShowImage("video", pFrame); if( cvWaitKey(100) >= 0 ) break; } cvDestroyAllWindows(); cvReleaseCapture(&pCapture); return 0; }