OpenCV裁剪图片并保存

http://blog.csdn.net/chenli2010/article/details/7899773

 

#include <cv.h>#include <highgui.h>#include<iostream>  #pragma comment(lib, "cv.lib")#pragma comment(lib, "cxcore.lib")#pragma comment(lib, "highgui.lib")CvPoint pt1 = cvPoint(0,0);  CvPoint pt2 = cvPoint(0,0);  bool is_selecting = false;  // callback function  void cvMouseCallback(int mouseEvent,int x,int y,int flags,void* param)  {  switch(mouseEvent)  {  case CV_EVENT_LBUTTONDOWN:  pt1 = cvPoint(x,y);  pt2 = cvPoint(x,y);  is_selecting = true;  break;  case CV_EVENT_MOUSEMOVE:  if(is_selecting)  pt2 = cvPoint(x,y);  break;  case CV_EVENT_LBUTTONUP:  pt2 = cvPoint(x,y);  is_selecting = false;  break;  }  return;  }  int main(int argc,char* argv[])  {  printf("用鼠标左键在图像窗口中画框，以得到目标区域的大致位置.\   \n然后用a,s,d,w移动所选区域，用1，2,3,5放大或缩小之\   \n由于opencv中键盘响应函数不能响应键盘中的方向键、shift键和ctrl键\   \n所以用tab来切换状态（放大和缩小）。\   \n选择结束后用enter键保存。Esc键退出。");char img_path[80] = ".\\test.png";  char save_path[80] = ".\\save.jpg";  char* window = "img";  IplImage* img = cvLoadImage(img_path);    IplImage* img_show = cvCloneImage(img);  cvNamedWindow(window,CV_WINDOW_AUTOSIZE);  cvSetMouseCallback(window,cvMouseCallback);  bool shift_on = false;  char text[80];  CvFont font;  cvInitFont(&font,CV_FONT_HERSHEY_PLAIN,1.0,1.0);  while(true)  {  cvCopy(img,img_show);  cvRectangle(img_show,pt1,pt2,cvScalar(255,255,255));  sprintf(text,"roi = cvRect(%d,%d,%d,%d)",pt1.x,pt1.y,std::abs(pt2.x-pt1.x),std::abs(pt2.y-pt1.y));  cvPutText(img_show,text,cvPoint(10,20),&font,cvScalar(0,0,255));  cvShowImage(window,img_show);  char key = cvWaitKey(10);  switch(key)  {  case '\t':  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;  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 '5':  if(shift_on) pt1.y--;  else pt2.y--;  break;  case '\r':  cvSetImageROI(img, cvRect(pt1.x,pt1.y,std::abs(pt2.x-pt1.x), std::abs(pt2.y-pt1.y)));  cvSaveImage(save_path, img);  cvResetImageROI(img);  break;  };  if(key==27) break;  }  cvReleaseImage(&img);  cvReleaseImage(&img_show);  return 0;  }