opencv鼠标键盘事件处理

直接上码
#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"

#include <iostream>
#include <ctype.h>

using namespace cv;
using namespace std;

CvPoint pt1 = Point(0,0);
CvPoint pt2 = Point(0,0);
bool is_selecting = false;

void cvMouseCallback(int mouseEvent,int x,int y,int flags,void* param)
{
  switch(mouseEvent)
  {
  case CV_EVENT_LBUTTONDOWN:
    pt1 = Point(x,y);
    pt2 = Point(x,y);
    is_selecting = true;
    break;
  case CV_EVENT_MOUSEMOVE:
    if(is_selecting)
      pt2 = Point(x,y);
    break;
  case CV_EVENT_LBUTTONUP:
    pt2 = Point(x,y);
    is_selecting = false;
    break;
  }
  return;
}

int main(int argc,char* argv[])
{
  char* window = "img";
  Mat img = imread("D:\1.jpg"，1);  
  Mat img_show,roi; 
  img.copyTo(img_show);
  namedWindow(window,CV_WINDOW_AUTOSIZE);
  setMouseCallback(window,cvMouseCallback);
  bool shift_on = false;
  while(true)
  {
    img.copyTo(img_show);
    rectangle(img_show,pt1,pt2,Scalar(255,255,255));
    imshow(window,img_show);
    char key = cvWaitKey(10);
    switch(key)
    {
    //ROI平移操作
                case '	':
      shift_on = !shift_on; break;
    case 'a':
      pt1.x--; pt2.x--; break;
    case 's':
      pt1.y++; pt2.y++; break;
    case 'd':
      pt1.x++; pt2.x++; break;
    case 'w':
      pt1.y--; pt2.y--; break;
    
               //ROI放大和缩小，主要是对初始设置的ROI区域的边缘进行平移操作
    case '1':
      if(shift_on) pt1.x--; 
      else pt2.x--;
      break;
    case '2':
      if(shift_on) pt2.y++; 
      else pt1.y++;
      break;
    case '3':
      if(shift_on) pt2.x++;
      else pt1.x++;
      break;
    case '4':
      if(shift_on) pt1.y--;
      else pt2.y--;
      break;

    //回车确定最终ROI区域的截取，并将其保存下来
    case '
':
      roi=img(Rect(pt1.x,pt1.y,std::abs(pt2.x-pt1.x),std::abs(pt2.y-pt1.y)));
      imwrite("D:\ROI.jpg",roi);
      break;
    };

    if(key==27) break;
  }
  return 0;
}