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本文主要介绍通过Opencv显示一副图像，同时又可以使用鼠标左键框选局部区域且放大一倍；
1. 使用IplImage的示例代码
#include <stdio.h>#include "opencv2/core/core.hpp"#include "opencv2/imgproc/imgproc.hpp"#include "opencv2/highgui/highgui.hpp"#pragma comment( lib, "ippicvmt.lib") #pragma comment( lib, "IlmImfd.lib")#pragma comment( lib, "libjasperd.lib")#pragma comment( lib, "libjpegd.lib")#pragma comment( lib, "libpngd.lib")#pragma comment( lib, "libtiffd.lib")#pragma comment( lib, "libwebpd.lib")#pragma comment( lib, "opencv_calib3d310d.lib")#pragma comment( lib, "opencv_core310d.lib")#pragma comment( lib, "opencv_features2d310d.lib")#pragma comment( lib, "opencv_flann310d.lib")#pragma comment( lib, "opencv_highgui310d.lib")#pragma comment( lib, "opencv_imgcodecs310d.lib")#pragma comment( lib, "opencv_imgproc310d.lib")#pragma comment( lib, "zlibd.lib")using namespace cv;cv::Mat org, dst, img, tmp;IplImage *pOrg;IplImage *pSrc;IplImage *pDst;IplImage *pTemp;static char *pWindowsName = "img";static char *pRoi = "roi";void on_mouse(int event, int x, int y, int flags, void *ustc)//event鼠标事件代号，x,y鼠标坐标，flags拖拽和键盘操作的代号{static CvPoint pre_pt = (-1, -1);//初始坐标static CvPoint cur_pt = (-1, -1);//实时坐标char temp[128];CvFont font;cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, 8);if (event == CV_EVENT_LBUTTONDOWN)//左键按下，读取初始坐标，并在图像上该点处划圆 {//org.copyTo(img);//将原始图片复制到img中 cvCopy(pOrg, pSrc);sprintf(temp, "(%d,%d)", x, y);pre_pt = CvPoint(x, y);//putText(img,temp,pre_pt,FONT_HERSHEY_SIMPLEX,0.5,Scalar(0,0,0,255),1,8);//在窗口上显示坐标 cvPutText(pSrc, temp, pre_pt, &font, cvScalar(0, 0, 0, 255));//在窗口上显示坐标//circle(img,pre_pt,2,Scalar(255,0,0,0),CV_FILLED,CV_AA,0);//划圆 cvCircle(pSrc, pre_pt, 2, Scalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);//划圆 //imshow("img",tmp); cvShowImage(pWindowsName, pSrc);}else if (event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON))//左键没有按下的情况下鼠标移动的处理函数 {//img.copyTo(tmp);//将img复制到临时图像tmp上，用于显示实时坐标 cvCopy(pSrc, pTemp);//将img复制到临时图像tmp上，用于显示实时坐标 sprintf(temp, "(%d,%d)", x, y);cur_pt = Point(x, y);//putText(tmp,temp,cur_pt,FONT_HERSHEY_SIMPLEX,0.5,Scalar(0,0,0,255));//只是实时显示鼠标移动的坐标 cvPutText(pTemp, temp, cur_pt, &font, cvScalar(0, 0, 0, 255));//只是实时显示鼠标移动的坐标 //imshow("img",tmp); cvShowImage(pWindowsName, pTemp);}else if (event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))//左键按下时，鼠标移动，则在图像上划矩形 {//img.copyTo(tmp); cvCopy(pSrc, pTemp);sprintf(temp, "(%d,%d)", x, y);cur_pt = Point(x, y);//putText(tmp,temp,cur_pt,FONT_HERSHEY_SIMPLEX,0.5,Scalar(0,0,0,255)); cvPutText(pTemp, temp, cur_pt, &font, cvScalar(0, 0, 0, 255));//rectangle(tmp,pre_pt,cur_pt,Scalar(0,255,0,0),1,8,0);//在临时图像上实时显示鼠标拖动时形成的矩形 cvRectangle(pTemp, pre_pt, cur_pt, cvScalar(0, 255, 0, 0), 1, 8, 0);//在临时图像上实时显示鼠标拖动时形成的矩形 //imshow("img",tmp); cvShowImage(pWindowsName, pTemp);}else if (event == CV_EVENT_LBUTTONUP)//左键松开，将在图像上划矩形 {//org.copyTo(img); cvCopy(pOrg, pSrc);sprintf(temp, "(%d,%d)", x, y);cur_pt = Point(x, y);//putText(img,temp,cur_pt,FONT_HERSHEY_SIMPLEX,0.5,Scalar(0,0,0,255)); cvPutText(pSrc, temp, cur_pt, &font, cvScalar(0, 0, 0, 255));//circle(img,pre_pt,2,Scalar(255,0,0,0),CV_FILLED,CV_AA,0); cvCircle(pSrc, pre_pt, 2, cvScalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);//rectangle(img,pre_pt,cur_pt,Scalar(0,255,0,0),1,8,0);//根据初始点和结束点，将矩形画到img上 cvRectangle(pSrc, pre_pt, cur_pt, cvScalar(0, 255, 0, 0), 1, 8, 0);//根据初始点和结束点，将矩形画到img上 //imshow("img",img); cvShowImage(pWindowsName, pSrc);//img.copyTo(tmp); cvCopy(pSrc, pTemp);//截取矩形包围的图像，并保存到dst中 int width = abs(pre_pt.x - cur_pt.x);int height = abs(pre_pt.y - cur_pt.y);if (width == 0 || height == 0){printf("width == 0 || height == 0");return;}//dst = org(Rect(min(cur_pt.x,pre_pt.x),min(cur_pt.y,pre_pt.y),width,height)); //namedWindow("dst"); //imshow("dst",dst); cvDestroyWindow(pRoi);cvSetImageROI(pOrg, cvRect(min(cur_pt.x, pre_pt.x), min(cur_pt.y, pre_pt.y), width, height));pDst = cvCreateImage(cvSize(width*2, height*2), pOrg->depth, pOrg->nChannels);cvResize(pOrg, pDst);cvResetImageROI(pOrg);cvNamedWindow(pRoi, 1);cvShowImage(pRoi, pDst);cvReleaseImage(&pDst);waitKey(0);cvDestroyAllWindows();}}void main(){//org = imread(“1.jpg”);//org.copyTo(img);//org.copyTo(tmp);//namedWindow(“img”);//定义一个img窗口//setMouseCallback(“img”,on_mouse,0);//调用回调函数//imshow(“img”,img);//cv::waitKey(0);pOrg = cvLoadImage("lena.jpg", 1);pSrc = cvCloneImage(pOrg);pDst = cvCloneImage(pOrg);pTemp = cvCloneImage(pOrg);cvNamedWindow(pWindowsName, 0);setMouseCallback(pWindowsName, on_mouse, 0);//调用回调函数cvShowImage(pWindowsName, pOrg);cvWaitKey(0);cvDestroyAllWindows();cvReleaseImage(&pOrg);cvReleaseImage(&pSrc);cvReleaseImage(&pDst);cvReleaseImage(&pTemp);return ;}
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参考网址：/ziliao/354165
