OpenCV入门教程06.39：关键点检测-GFTTDetector

索引地址：系列索引

角点和角点检测：角点检测

该方法是基于shi-tomas角点检测变化而来的一种特征提取方法，OpenCV创建该检测器的API与goodfeaturetotrack的API参数极其类似：

Ptr<GFTTDetector> cv::GFTTDetector::create(
int maxCorners = 1000,
double qualityLevel = 0.01,
double minDistance = 1,
int blockSize = 3,
bool useHarrisDetector = false,
double k = 0.04 
)

唯一不同的，该方法返回一个指针。

该方法无法提取描述子，只支持提取关键点！

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char** argv) {
    Mat src = imread("test1.png");
    auto keypoint_detector = GFTTDetector::create(1000, 0.01, 1.0, 3, false, 0.04);
    vector<KeyPoint> kpts;
    keypoint_detector->detect(src, kpts);
    Mat result = src.clone();
    drawKeypoints(src, kpts, result, Scalar::all(-1), DrawMatchesFlags::DEFAULT);
    imshow("GFTT-Keypoint-Detect", result);
    imwrite("result.png", result);
    waitKey(0);
    return 0;
}

效果为：