在自己建立行人检测的图像库时用到，参考别人的修改了一下：
1 #include "opencv2/core/core.hpp" 2 #include "opencv2/highgui/highgui.hpp" 3 #include "opencv2/imgproc/imgproc.hpp" 4 #include <stdio.h> 5 using namespace cv; 6 7 IplImage* org = 0; 8 IplImage* img = 0; 9 IplImage* tmp = 0; 10 IplImage* dst = 0; 11 static int n=0; 12 static char savename[20]; 13 void on_mouse( int event, int x, int y, int flags, void* ustc) 14 { 15 static CvPoint pre_pt = {-1,-1}; 16 static CvPoint cur_pt = {-1,-1}; 17 CvFont font; 18 cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA); 19 char temp[16];
char lenth_and_height[30];//用于查看选区的宽度和高度
20 21 if( event == CV_EVENT_LBUTTONDOWN ) 22 { 23 cvCopy(org,img); 24 sprintf(temp,"(%d,%d)",x,y); 25 pre_pt = cvPoint(x,y); 26 cvPutText(img,temp, pre_pt, &font, cvScalar(0,0, 0, 255)); 27 cvCircle( img, pre_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 ); 28 cvShowImage( "img", img ); 29 cvCopy(img,tmp); 30 } 31 else if( event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON)) 32 { 33 cvCopy(tmp,img); 34 sprintf(temp,"(%d,%d)",x,y); 35 cur_pt = cvPoint(x,y); 36 cvPutText(img,temp, cur_pt, &font, cvScalar(0,0, 0, 255)); 37 cvShowImage( "img", img ); 38 } 39 else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON)) 40 { 41 cvCopy(tmp,img); 42 sprintf(temp,"(%d,%d)",x,y); 43 cur_pt = cvPoint(x,y); 44 cvPutText(img,temp, cur_pt, &font, cvScalar(0,0, 0, 255)); 45 cvRectangle(img, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, 8, 0 );
1 sprintf(lenth_and_height,"(Width:%d,Height:%d)",abs(cur_pt.x-pre_pt.x),abs(cur_pt.y-pre_pt.y)); 2 /*----------------------------------------------------------------------------- 3 * 4 * 5 * 为了方便随时查看自己选区的宽度和高度，特意加了一个点，该点计算为取矩形窗左上点和右下点的中点 6 * 7 * 8 *-----------------------------------------------------------------------------*/ 9 CvPoint origin; 10 origin.x=(pre_pt.x+cur_pt.x)/2; 11 origin.y=(pre_pt.y+cur_pt.y)/2; 12 cvPutText(img,lenth_and_height, origin, &font, cvScalar(0,0, 0, 255));
46 cvShowImage( "img", img ); 47 } 48 else if( event == CV_EVENT_LBUTTONUP ) 49 { 50 cvCopy(tmp,img); 51 sprintf(temp,"(%d,%d)",x,y); 52 cur_pt = cvPoint(x,y); 53 cvPutText(img,temp, cur_pt, &font, cvScalar(0,0, 0, 255)); 54 cvCircle( img, cur_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 ); 55 cvRectangle( img, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, 8, 0 ); 56 cvShowImage( "img", img ); 57 cvCopy(img,tmp); 58 int width=abs(pre_pt.x-cur_pt.x); 59 int height=abs(pre_pt.y-cur_pt.y); 60 if(width==0 || height==0) 61 { 62 cvDestroyWindow("dst"); 63 return; 64 } 65 dst=cvCreateImage(cvSize(width,height),org->depth,org->nChannels); 66 CvRect rect; 67 if(pre_pt.x<cur_pt.x && pre_pt.y<cur_pt.y) 68 { 69 rect=cvRect(pre_pt.x,pre_pt.y,width,height); 70 } 71 else if(pre_pt.x>cur_pt.x && pre_pt.y<cur_pt.y) 72 { 73 rect=cvRect(cur_pt.x,pre_pt.y,width,height); 74 } 75 else if(pre_pt.x>cur_pt.x && pre_pt.y>cur_pt.y) 76 { 77 rect=cvRect(cur_pt.x,cur_pt.y,width,height); 78 } 79 else if(pre_pt.x<cur_pt.x && pre_pt.y>cur_pt.y) 80 { 81 rect=cvRect(pre_pt.x,cur_pt.y,width,height); 82 } 83 cvSetImageROI(org,rect); 84 cvCopy(org,dst); 85 cvResetImageROI(org); 86 cvDestroyWindow("dst"); 87 cvNamedWindow("dst",1); 88 cvShowImage("dst",dst); 89 90 sprintf(savename,"save%03d.jpg",n); 91 92 cvSaveImage(savename,dst); 93 n++; 94 } 95 } 96 int main(int argc, char *argv[]) 97 { 98 99 100 org=cvLoadImage(argv[1],1); 101 img=cvCloneImage(org); 102 tmp=cvCloneImage(org); 103 cvNamedWindow("img",1); 104 cvSetMouseCallback( "img", on_mouse, 0 ); 105 106 cvShowImage("img",img); 107 cvWaitKey(0); 108 cvDestroyAllWindows(); 109 cvReleaseImage(&org); 110 cvReleaseImage(&img); 111 cvReleaseImage(&tmp); 112 cvReleaseImage(&dst); 113 return 0; 114 }
运行效果：
