opencv关于视频中画矩形的问题？？？求高手

[tlnlove2011]

我的程序是这样的 坐标能显示出来，就是画不出矩形
#include "stdafx.h"
#include <stdio.h>
#include <cv.h>
#include <cxcore.h>
#include<stdlib.h>
#include"highgui.h"

CvRect box;
bool Drawing=false;

void MouseDraw(int event,int x,int y,int flags,void*param);

void DrawRect(IplImage*pFrame,CvRect rect)
{
cvRectangle(pFrame,
cvPoint(box.x,box.y),
cvPoint(box.x+box.width,box.y+box.height),
cvScalar(0xff,0x00,0x00));
}
int main(int argc,char **argv)
{
box=cvRect(0,0,-1,-1);
IplImage* pFrame = NULL;
IplImage* pFrImg = NULL;
IplImage* pBkImg = NULL;

CvMat* pFrameMat = NULL;
CvMat* pFrMat = NULL;
CvMat* pBkMat = NULL;

int nFrmNum=0;

cvNamedWindow("video",CV_WINDOW_AUTOSIZE);
cvNamedWindow("background",1);
cvNamedWindow("foreground",1);

cvMoveWindow("video", 30, 0);
cvMoveWindow("background", 360, 0);
cvMoveWindow("foreground", 690, 0);

CvCapture *pCapture=cvCreateFileCapture("tingche.avi");

while(pFrame = cvQueryFrame( pCapture ))
{

nFrmNum++;
printf("第%d帧\n",nFrmNum);
cvSetMouseCallback("video",MouseDraw,(void*)pFrame); //Set the callback function of mouse event
IplImage*temp=cvCloneImage(pFrame);
cvCopyImage(pFrame,temp);
if(Drawing)
DrawRect(temp,box);
cvShowImage("video",temp);
//如果是第一帧，需要申请内存，并初始化
if(nFrmNum == 1)
{
pBkImg = cvCreateImage(cvSize(pFrame->width, pFrame->height), IPL_DEPTH_8U,1);
pFrImg = cvCreateImage(cvSize(pFrame->width, pFrame->height), IPL_DEPTH_8U,1);

pBkMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);
pFrMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);
pFrameMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);

//转化成单通道图像再处理
cvCvtColor(pFrame, pBkImg, CV_BGR2GRAY);
cvCvtColor(pFrame, pFrImg, CV_BGR2GRAY);

cvConvert(pFrImg, pFrameMat);
cvConvert(pFrImg, pFrMat);
cvConvert(pFrImg, pBkMat);
}
else
{
cvCvtColor(pFrame, pFrImg, CV_BGR2GRAY);
cvConvert(pFrImg, pFrameMat);
//高斯滤波先，以平滑图像
//cvSmooth(pFrameMat, pFrameMat, CV_GAUSSIAN, 3, 0, 0);

//当前帧跟背景图相减
cvAbsDiff(pFrameMat, pBkMat, pFrMat);

//二值化前景图
cvThreshold(pFrMat, pFrImg, 60, 255.0, CV_THRESH_BINARY);

//进行形态学滤波，去掉噪音
//cvErode(pFrImg, pFrImg, 0, 1);
//cvDilate(pFrImg, pFrImg, 0, 1);

//更新背景
cvRunningAvg(pFrameMat, pBkMat, 0.003, 0);
//将背景转化为图像格式，用以显示
cvConvert(pBkMat, pBkImg);

//显示图像
cvShowImage("video", pFrame);
cvShowImage("background", pBkImg);
cvShowImage("foreground", pFrImg);

//如果有按键事件，则跳出循环
//此等待也为cvShowImage函数提供时间完成显示
//等待时间可以根据CPU速度调整
char c=cvWaitKey(33);

}

}




//销毁窗口
cvDestroyWindow("video");
cvDestroyWindow("background");
cvDestroyWindow("foreground");

//释放图像和矩阵
cvReleaseImage(&pFrImg);
cvReleaseImage(&pBkImg);

cvReleaseMat(&pFrameMat);
cvReleaseMat(&pFrMat);
cvReleaseMat(&pBkMat);

cvReleaseCapture(&pCapture);
return 0;
}
void MouseDraw(int event,int x,int y,int flags,void*param)
{
IplImage*pFrame=(IplImage*)param;
switch(event)
{
case CV_EVENT_MOUSEMOVE:
{
if(Drawing)
{
box.width=x-box.x;
box.height=y-box.y;
}
}
break;
case CV_EVENT_LBUTTONDOWN:
{
Drawing=true;
box=cvRect(x,y,0,0);
printf("%d,%d\n",x,y);
}
break;
case CV_EVENT_LBUTTONUP:
{
Drawing=false;
if (box.width<0)
{
box.x+=box.width;
box.width*=-1;
}
if (box.height<0)
{
box.y+=box.height;
box.height*=-1;
}
DrawRect(pFrame,box);
printf("%d,%d\n",x,y);
}
break;
}

}

[wqvbjhc]

没显示出来而已，在

  if(Drawing)
  {
  box.width=x-box.x;
  box.height=y-box.y;
  }

改为

  if(Drawing)
  {
  box.width=x-box.x;
  box.height=y-box.y;
  DrawRect(pFrame,box);
  cvShowImage("video",pFrame);
  }

[dianzi0701a]

感觉还可以，借鉴下，

[三_省_吾_身]

你把图像放大看看