corner detect

#include "highgui.h"
#include "cv.h"
#include <stdio.h>

#define MAX_CORNERS 50

int capture_data()
{
	CvCapture* capture;
	IplImage* frame;
	IplImage* gray;
	IplImage* eigImage=NULL;
	IplImage* tempImage=NULL;

	CvPoint2D32f corners[MAX_CORNERS]={0};
	int corner_count=MAX_CORNERS,i;
	char c;

	capture=cvCreateCameraCapture(0);
	if(!capture)
		return -1;
	cvNamedWindow("capture_data",CV_WINDOW_AUTOSIZE);

	while(1)
	{
		frame=cvQueryFrame(capture);
		if(!frame) break;

		gray=cvCreateImage( cvGetSize(frame), IPL_DEPTH_8U, 1 );;
		eigImage=cvCreateImage( cvGetSize(frame), IPL_DEPTH_32F, 1 );
		tempImage=cvCreateImage( cvGetSize(frame), IPL_DEPTH_32F, 1 );

		cvCvtColor(frame,gray,CV_BGR2GRAY);
		cvGoodFeaturesToTrack(gray,eigImage,tempImage,corners,&corner_count,0.01f,2.0,0,3,0,0.04f);
		for(i=0;i<corner_count;i++)
			cvRectangle(frame,cvPoint(corners[i].x-2,corners[i].y-2),cvPoint(corners[i].x+2,corners[i].y+2),cvScalar(255,0,0,0),1,8,0);

		cvShowImage("capture_data",frame);
		c=cvWaitKey(33);
		if(c==27) break;	
	}

	return 0;
}

int main(int argc,char** argv)
{
	if(capture_data()==-1)
		printf("load camera fail!");
	return 0;
}

注意cvGoodFeaturesToTrack这函数的参数，尤其是corner_count