这个程序类似于淘宝购物时，在商品图像上移动鼠标，会出现一个放大鼠标周围矩形区域内的局部图像的窗口。话不多说，直接贴代码。
#include <cv.h> #include <highgui.h> #include <stdio.h> #pragma comment( lib, "cv.lib" ) #pragma comment( lib, "cxcore.lib" ) #pragma comment( lib, "highgui.lib" ) IplImage* org = 0; IplImage* img = 0; IplImage* dst = 0; int foo=60; void on_mouse( int event, int x, int y, int flags, void* ustc) { if( event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON)) { cvCopy(org,img); CvPoint p0; CvPoint p1; if(x<foo) { if(y<foo) { p0=cvPoint(0,0); p1=cvPoint(2*foo,2*foo); } else if(y>img->height-foo) { p0=cvPoint(0,img->height-2*foo); p1=cvPoint(2*foo,img->height); } else { p0=cvPoint(0,y-foo); p1=cvPoint(2*foo,y+foo); } } else if(x>img->width-foo) { if(y<foo) { p0=cvPoint(img->width-2*foo,0); p1=cvPoint(img->width,2*foo); } else if(y>img->height-foo) { p0=cvPoint(img->width-2*foo,img->height-2*foo); p1=cvPoint(img->width,img->height); } else { p0=cvPoint(img->width-2*foo,y-foo); p1=cvPoint(img->width,y+foo); } } else { if(y<foo) { p0=cvPoint(x-foo,0); p1=cvPoint(x+foo,2*foo); } else if(y>img->height-foo) { p0=cvPoint(x-foo,img->height-2*foo); p1=cvPoint(x+foo,img->height); } else { p0=cvPoint(x-foo,y-foo); p1=cvPoint(x+foo,y+foo); } } cvRectangle(img,p0,p1,CV_RGB(0,255,0)); cvSetImageROI(org,cvRect(p0.x,p0.y,p1.x-p0.x,p1.y-p0.y)); cvResize(org,dst); cvResetImageROI(org); cvShowImage( "img", img ); cvShowImage("dst",dst); } } int main() { org=cvLoadImage("lena.jpg",1); img=cvCloneImage(org); dst=cvCreateImage(cvSize(foo*4,foo*4),org->depth,org->nChannels); cvNamedWindow("img",1); cvSetMouseCallback( "img", on_mouse, 0 ); cvShowImage("img",img); cvNamedWindow("dst",1); cvWaitKey(0); cvDestroyAllWindows(); cvReleaseImage(&org); cvReleaseImage(&img); cvReleaseImage(&dst); return 0; }
效果图如下