角点检测

//opencv论坛的代码

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace cv;
using namespace std;

/// Global variables
Mat src, src_gray;
int thresh = 200;
int max_thresh = 255;

char* source_window = "Source image";
char* corners_window = "Corners detected";

/// Function header
void cornerHarris_demo(int, void*);

/** @function main */
int main(int argc, char** argv)
{
/// Load source image and convert it to gray
src = imread("1.jpg", 1);
cvtColor(src, src_gray, CV_BGR2GRAY);
resize(src_gray, src_gray, Size(300, 300));
/// Create a window and a trackbar
namedWindow(source_window, CV_WINDOW_AUTOSIZE);
createTrackbar("Threshold: ", source_window, &thresh, max_thresh, cornerHarris_demo);
imshow(source_window, src);

cornerHarris_demo(0, 0);

waitKey(0);
return(0);
}

/** @function cornerHarris_demo */
void cornerHarris_demo(int, void*)
{

Mat dst, dst_norm, dst_norm_scaled;
dst = Mat::zeros(src.size(), CV_32FC1);

/// Detector parameters
int blockSize = 2;
int apertureSize = 3;
double k = 0.04;

/// Detecting corners
cornerHarris(src_gray, dst, blockSize, apertureSize, k, BORDER_DEFAULT);

/// Normalizing
normalize(dst, dst_norm, 0, 255, NORM_MINMAX, CV_32FC1, Mat());
convertScaleAbs(dst_norm, dst_norm_scaled);

/// Drawing a circle around corners
for (int j = 0; j < dst_norm.rows; j++)
{
for (int i = 0; i < dst_norm.cols; i++)
{
if ((int)dst_norm.at<float>(j, i) > thresh)
{
circle(dst_norm_scaled, Point(i, j), 5, Scalar(0), 2, 8, 0);
}
}
}
/// Showing the result
namedWindow(corners_window, CV_WINDOW_AUTOSIZE);
imshow(corners_window, dst_norm_scaled);
}