opencv指定矩形区域并跟踪

#include "opencv2/video/tracking.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <iostream>
#include <ctype.h>

using namespace cv;
using namespace std;


Mat image;
bool backprojMode = false;
bool selectObject = false;
int trackObject = 0;
bool showHist = true;
Point origin;
Rect selection;
int vmin = 10, vmax = 256, smin = 30;


//--------------------------------【onMouse( )回调函数】------------------------------------
// 描述：鼠标操作回调
//-------------------------------------------------------------------------------------------------
static void onMouse(int event, int x, int y, int, void*)
{
if (selectObject)
{
selection.x = MIN(x, origin.x);
selection.y = MIN(y, origin.y);

selection.width = std::abs(x - origin.x);
selection.height = std::abs(y - origin.y);

selection &= Rect(0, 0, image.cols, image.rows);
}

switch (event)
{
//此句代码的OpenCV2版为：
//case CV_EVENT_LBUTTONDOWN:
//此句代码的OpenCV3版为：
case EVENT_LBUTTONDOWN:
origin = Point(x, y);
selection = Rect(x, y, 0, 0);
selectObject = true;
break;
//此句代码的OpenCV2版为：
//case CV_EVENT_LBUTTONUP:
//此句代码的OpenCV3版为：
case EVENT_LBUTTONUP:
selectObject = false;
if (selection.width > 0 && selection.height > 0)
trackObject = -1;
break;
}
}

//--------------------------------【help( )函数】----------------------------------------------
// 描述：输出帮助信息
//-------------------------------------------------------------------------------------------------