这个实验和之前的画圆的类似,先捕捉图像,然后再上面输出文字。
#include "stdafx.h"
#include "highgui.h"
#include "cv.h"
#include "stdio.h"
#include <ctype.h>
#include <time.h>
int main(int argc,char ** argv)
{
time_t t;
char showMsg[256];
//the font variable
CvFont font;
CvCapture *capture = 0;
//从摄像头读取
capture = cvCaptureFromCAM(0);
if(!capture)
{
fprintf(stderr,"Could not initialize capturing...\n");
return -1;
}
cvNamedWindow("Laplacian",1);
//循环捕捉,直到用户按键跳出循环体
for(;;)
{
IplImage * frame =0;
//抓起一祯
frame = cvQueryFrame(capture);
if(!frame)
break;
time(&t);
strftime(showMsg, sizeof(showMsg), "%H%M%S", localtime(&t) ); //格式化输出.
// 初始化字体
cvInitFont(&font,CV_FONT_HERSHEY_SIMPLEX, 4.5,1,0,2);//初始化字体,准备写到图片上的
// cvPoint 为起笔的x,y坐标
cvPutText(frame,showMsg,cvPoint(300,100),&font,CV_RGB(255,0,0));//在图片中输出字符
cvShowImage("Laplacian",frame);
if(cvWaitKey(10)>0)
break;
}
cvReleaseCapture(&capture);
cvDestroyWindow("Laplacian");
return 0;
}
参考:
1.http://blog.csdn.net/jiadelin/article/details/2916329 strftime()函数用法
2.http://blog.csdn.net/jinshengtao/article/details/20549221 利用OpenCV给图像添加标注
3.http://blog.csdn.net/ycc892009/article/details/6516528 opencv-在图像上显示字符(不包括中文)


