OpenCV cvGoodFeaturesToTrack

cvGoodFeaturesToTrackTest.c

#include <opencv2/opencv.hpp>

int _tmain(int argc, _TCHAR* argv[])
{
    // Load a color image, and convert it into grayscale  
    char filename[260];
    for (int i = 1; i < 14; i++) {
        sprintf(filename, "./1/%d.png", i);

        IplImage* img = cvLoadImage(filename, CV_LOAD_IMAGE_COLOR);
        assert(NULL != img);
        IplImage* img_gray = cvCreateImage(cvGetSize(img), 8, 1);
        cvCvtColor(img, img_gray, CV_BGR2GRAY);

        // Create temporary images required by cvGoodFeaturesToTrack  
        IplImage* img_temp = cvCreateImage(cvGetSize(img), 32, 1);
        IplImage* img_eigen = cvCreateImage(cvGetSize(img), 32, 1);

        // Create the array to store the points detected( <= 1000 )  
        int count = 1000;
        CvPoint2D32f* corners = new CvPoint2D32f[count];

        // Find corners  
        cvGoodFeaturesToTrack(img_gray, img_eigen, img_temp, corners, &count, 0.1, 10);

        // Mark these corners on the original image  
        for (int i = 0; i<count; i++)
            cvLine(img, cvPoint(corners[i].x, corners[i].y), cvPoint(corners[i].x, corners[i].y), CV_RGB(255, 0, 0), 5);

        // Display it  
        cvNamedWindow(filename);
        cvShowImage(filename, img);

        // Print the number of corners  
        printf("Detected Points : %d\n", count);
    }

    cvWaitKey(0);
    return 0;
}