opencv摄像头采集图像彩色图转换成灰度图

#include "cxcore.h"
#include "cvcam.h"
#include "windows.h"
#include "cv.h"
#include "highgui.h"
#include "stdio.h"

#pragma comment(lib, "cv.lib")
#pragma comment(lib, "cxcore.lib")
#pragma comment(lib, "highgui.lib")


int main(int argc,char ** argv)
{
       IplImage * laplace = 0;
       IplImage * colorlaplace = 0;
       IplImage * planes[3] = {0,0,0};
       CvCapture *capture = 0;
   IplImage* logpolar_frame ;
       //从摄像头读取
   capture = cvCaptureFromCAM(0);

       cvNamedWindow("灰度图",1);

       //循环捕捉，直到用户按键跳出循环体
       while(1)
       {
              IplImage * frame =0;

              frame = cvQueryFrame(capture); //抓起一祯

              logpolar_frame = cvCreateImage(cvSize(frame->width,frame->height), IPL_DEPTH_8U, 1); //创建图像           
  cvCvtColor( frame, logpolar_frame, CV_BGR2GRAY );//彩色装换成灰度值
      logpolar_frame->origin=1;//视频与原视频方向一致

              cvShowImage("灰度图",logpolar_frame);

              if(cvWaitKey(10)>0)
                     break;
       }

       cvReleaseCapture(&capture);
       cvDestroyWindow("灰度图");
       return 0;
}