好久没有更新博客了，今天临时起意，将以前写的示例代码整理了一下，暂且发布一篇，希望对大家有用！
代码一：点击时显示坐标，鼠标移动时不显示。
#include <cv.h>#include <highgui.h>#include <stdio.h>IplImage* src=0;void on_mouse( int event, int x, int y, int flags, void* ustc){CvFont font;cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);if( event == CV_EVENT_LBUTTONDOWN ){CvPoint pt = cvPoint(x,y);char temp[16];sprintf(temp,"(%d,%d)",pt.x,pt.y);cvPutText(src,temp, pt, &font, cvScalar(255, 255, 255, 0));cvCircle( src, pt, 2,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );cvShowImage( "src", src );} }int main(){src=cvLoadImage("lena.jpg",1);cvNamedWindow("src",1);cvSetMouseCallback( "src", on_mouse, 0 );cvShowImage("src",src);cvWaitKey(0); cvDestroyAllWindows();cvReleaseImage(&src);return 0;}代码二：鼠标移动时显示坐标，点击时不显示坐标#include <cv.h>#include <highgui.h>#include <stdio.h>IplImage* src=0;IplImage* dst=0;void on_mouse( int event, int x, int y, int flags, void* ustc){CvFont font;cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);if( event == CV_EVENT_MOUSEMOVE ){cvCopy(dst,src);CvPoint pt = cvPoint(x,y);char temp[16];sprintf(temp,"(%d,%d)",pt.x,pt.y);cvPutText(src,temp, pt, &font, cvScalar(255, 255, 255, 0));cvCircle( src, pt, 2,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );cvShowImage( "src", src );} }int main(){src=cvLoadImage("lena.jpg",1);dst=cvCloneImage(src);cvNamedWindow("src",1);cvSetMouseCallback( "src", on_mouse, 0 );cvShowImage("src",src);cvWaitKey(0); cvDestroyAllWindows();cvReleaseImage(&src);cvReleaseImage(&dst);return 0;}代码三：鼠标移动和点击时均显示坐标#include <cv.h>#include <highgui.h>#include <stdio.h>IplImage* src=0;IplImage* dst=0;void on_mouse( int event, int x, int y, int flags, void* ustc){char temp[16];CvPoint pt;CvFont font;cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);if( event == CV_EVENT_MOUSEMOVE ){cvCopy(dst,src);sprintf(temp,"(%d,%d)",x,y);pt = cvPoint(x,y);cvPutText(src,temp, pt, &font, cvScalar(255, 255, 255, 0));cvCircle( src, pt, 2,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );cvShowImage( "src", src );} else if( event == CV_EVENT_LBUTTONDOWN ){//cvCopy(dst,src);sprintf(temp,"(%d,%d)",x,y);pt = cvPoint(x,y);cvPutText(src,temp, pt, &font, cvScalar(255, 255, 255, 0));cvCircle( src, pt, 2,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );cvCopy(src,dst);cvShowImage( "src", src );} }int main(){src=cvLoadImage("lena.jpg",1);dst=cvCloneImage(src);cvNamedWindow("src",1);cvSetMouseCallback( "src", on_mouse, 0 );cvShowImage("src",src);cvWaitKey(0); cvDestroyAllWindows();cvReleaseImage(&src);cvReleaseImage(&dst);return 0;}代码四，上面的代码在边界处处理的不好，坐标值显示的不完全，下面是对代码三的改进。下面的代码还将点约束在图像的几何区域范围内。#include <cv.h>#include <highgui.h>#include <stdio.h>#define max(a,b)(((a) > (b)) ? (a) : (b))#define min(a,b)(((a) < (b)) ? (a) : (b))//注意参数是有符号短整型，该函数的作用是使i限定为[a,b]区间内int bound(short i,short a,short b){return min(max(i,min(a,b)),max(a,b));}IplImage* src=0;IplImage* dst=0;void on_mouse( int event, int x, int y, int flags, void* ustc){char temp[16];CvPoint pt;CvFont font;cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);CvPoint tmp_pt = {-1,-1};CvSize text_size;int baseline;if( event == CV_EVENT_MOUSEMOVE ){cvCopy(dst,src);x=bound(x,0,src->width-1);y=bound(y,0,src->height-1);pt = cvPoint(x,y);cvCircle( src, pt, 2,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );sprintf(temp,"(%d,%d)",x,y);cvGetTextSize(temp,&font,&text_size,&baseline);tmp_pt.x = bound(pt.x,0,src->width-text_size.width);tmp_pt.y = bound(pt.y,text_size.height+baseline,src->height-1-baseline);cvPutText(src,temp, tmp_pt, &font, cvScalar(255, 255, 255, 0));cvShowImage( "src", src );} else if( event == CV_EVENT_LBUTTONDOWN ){//cvCopy(dst,src);pt = cvPoint(x,y);cvCircle( src, pt, 2,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );sprintf(temp,"(%d,%d)",x,y);cvGetTextSize(temp,&font,&text_size,&baseline);tmp_pt.x = bound(pt.x,0,src->width-text_size.width);tmp_pt.y = bound(pt.y,text_size.height+baseline,src->height-1-baseline);cvPutText(src,temp, tmp_pt, &font, cvScalar(255, 255, 255, 0));cvCopy(src,dst);cvShowImage( "src", src );} }int main(){src=cvLoadImage("lena.jpg",1);dst=cvCloneImage(src);cvNamedWindow("src",1);cvSetMouseCallback( "src", on_mouse, 0 );cvShowImage("src",src);cvWaitKey(0); cvDestroyAllWindows();cvReleaseImage(&src);cvReleaseImage(&dst);return 0;}代码五，上面的代码不能撤销选定的坐标，，下面的代码对此进行了改进，右击撤销最近选择的点，并用互补的颜色表示选择的点和撤销选定的点。除此之外还将选择的坐标输出到文件。在点的坐标前还有一个数表示点的选定次序。#include <cv.h>#include <highgui.h>#include <stdio.h>#include <vector>#include <fstream>using namespace std;#define max(a,b)(((a) > (b)) ? (a) : (b))#define min(a,b)(((a) < (b)) ? (a) : (b))//注意参数是有符号短整型，该函数的作用是使i限定为[a,b]区间内int bound(short i,short a,short b){return min(max(i,min(a,b)),max(a,b));}CvScalar getInverseColor(CvScalar c){CvScalar s;for(int i=0;i<=2;++i){s.val[i]=255-c.val[i];}return s;}IplImage* src=0;IplImage* dst=0;int n=0;vector<CvPoint> points;void on_mouse( int event, int x, int y, int flags, void* ustc){CvPoint pt;CvPoint tmp_pt = {-1,-1};CvFont font;cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.4, 0.4, 0, 1, CV_AA);char temp[16];CvSize text_size;int baseline;CvScalar clrPoint=cvScalar(255,0,0,0);CvScalar clrText=cvScalar(255, 255, 255, 0);if( event == CV_EVENT_MOUSEMOVE ){cvCopy(dst,src);x=bound(x,0,src->width-1);y=bound(y,0,src->height-1);pt = cvPoint(x,y);cvCircle( src, pt, 2,clrPoint ,CV_FILLED, CV_AA, 0 );sprintf(temp,"%d (%d,%d)",n+1,x,y);cvGetTextSize(temp,&font,&text_size,&baseline);tmp_pt.x = bound(pt.x,0,src->width-text_size.width);tmp_pt.y = bound(pt.y,text_size.height+baseline,src->height-1-baseline);cvPutText(src,temp, tmp_pt, &font, clrText);cvShowImage( "src", src );} else if( event == CV_EVENT_LBUTTONDOWN){pt = cvPoint(x,y);points.push_back(pt); n++;cvCircle( src, pt, 2, clrPoint ,CV_FILLED, CV_AA, 0 );sprintf(temp,"%d (%d,%d)",n,x,y);cvGetTextSize(temp,&font,&text_size,&baseline);tmp_pt.x = bound(pt.x,0,src->width-text_size.width);tmp_pt.y = bound(pt.y,text_size.height+baseline,src->height-1-baseline);cvPutText(src,temp, tmp_pt, &font, clrText);cvCopy(src,dst);cvShowImage( "src", src );} else if( event == CV_EVENT_RBUTTONDOWN ){if(!points.empty()){cvCopy(dst,src);pt=points.back();points.pop_back();cvCircle( src, pt, 2, getInverseColor(clrPoint),CV_FILLED, CV_AA, 0 );sprintf(temp,"%d (%d,%d)",n,pt.x,pt.y); –n;cvGetTextSize(temp,&font,&text_size,&baseline);tmp_pt.x = bound(pt.x,0,src->width-text_size.width);tmp_pt.y = bound(pt.y,text_size.height+baseline,src->height-1-baseline);cvPutText(src,temp, tmp_pt, &font, getInverseColor(clrText));cvCopy(src,dst);cvShowImage( "src", src );}}}int main(){src=cvLoadImage("lena.jpg",1);dst=cvCloneImage(src);cvNamedWindow("src",1);cvSetMouseCallback( "src", on_mouse, 0 );cvShowImage("src",src);cvWaitKey(0); cvDestroyAllWindows();cvReleaseImage(&src);cvReleaseImage(&dst);ofstream file("sample.txt");if(!file){cout << "open file error!";return 1;}vector<CvPoint>::iterator it=points.begin();for(;it!=points.end();++it){file<< it->x<<‘,'<<it->y<<endl;}file<<endl;file.close();return 0;}
其的演示如下：
sample.txt中的内容如下：
319,351382,284275,292194,249357,210424,260350,251305,238274,189227,140224,375
如此锐气，二十后生有之，六旬男子则更多见。
