Opencv角点检测

#include "stdafx.h"

#define max_corners 20

int main()
{
int cornerNum = max_corners;
vector<Point2f>corner;
double qualityLevel = 0.05;
double minDistance = 5;
double scalar = 0.5;
Mat srcImg,srcImg1;
Mat grayImg,grayImg1,grayImg2;
Mat disImg;
int i;

//VideoCapture video("E:\\C_VC_code\\Text_Photo\\feini.flv");
VideoCapture video(0);
if(!video.isOpened())
{
return -1;
}
video>>srcImg;
resize(srcImg,srcImg1,Size(srcImg.cols*scalar,srcImg.rows*scalar),1,1,3);
cvtColor(srcImg1,grayImg,CV_BGR2GRAY, 1);
Rect rect;
double up,down,left,right;
while(1)
{
video>>srcImg;
resize(srcImg,srcImg1,Size(srcImg.cols*scalar,srcImg.rows*scalar),1,1,3);
//disImg = srcImg(Rect(200,150,130,130));
cvtColor(srcImg1,grayImg1,CV_BGR2GRAY, 1);
absdiff(grayImg1,grayImg,grayImg2);
goodFeaturesToTrack(grayImg2,corner,cornerNum,qualityLevel,minDistance,Mat(),3,false,0.04);
resize(srcImg,srcImg1,Size(srcImg.cols*scalar,srcImg.rows*scalar),1,1,3);
cvtColor(srcImg1,grayImg,CV_BGR2GRAY, 1);
up = left = 0x3f3f3f3f;
down = right = -0x3f3f3f3f;

for(i=0;i<corner.size();i++)
{
up = min(up, corner[i].y*1.0);
left = min(left, corner[i].x*1.0);
down = max(down, corner[i].y*1.0);
right = max(right, corner[i].x*1.0);
circle(srcImg1,Point(corner[i].x,corner[i].y),2,Scalar(0,255,0),2);
}
rect.x = left;
rect.y = up;
cout<< right<<" " <<down<<endl;
rect.width = right-left;
rect.height = up-down;

rectangle(srcImg1,rect,Scalar(255,0,0),2);

imshow("gray",grayImg2);
imshow("x",srcImg1);

if(waitKey(33)>0)
break;
}
return 0;
}