opencv的 FastFeatureDetector fast(40)怎么用不了

Question

#include

#include
#include
#include
#include

using namespace cv;

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

       Mat image;
       image = imread("1.jpg");
       // 存储为关键点
       std::vector<KeyPoint> keyPoints;
       // 定义特征检测
        FastFeatureDetector fast(40);        // 检测的阈值为40  “cv::FastFeatureDetector”: 不能实例化抽象类


       // 特征点检测
       fast.detect(image,keyPoints);
       drawKeypoints(image, keyPoints, image, Scalar::all(255), DrawMatchesFlags::DRAW_OVER_OUTIMG);
       imshow("FAST feature", image);
       waitKey(0);
return a.exec();

}

error: C2259: “cv::FastFeatureDetector”: 不能实例化抽象类
error: C2664: “cv::FastFeatureDetector::FastFeatureDetector(cv::FastFeatureDetector &&)”: 无法将参数 1 从“int”转换为“const cv::FastFeatureDetector &”

Answer 1

http://docs.opencv.org/3.0-beta/doc/user_guide/ug_features2d.html
试了是楼上的还是不行
去google了一下
把

 FastFeatureDetector fast(40);
fast.detect(image,keypoints);

改为：

 Ptr<FeatureDetector> fast=FastFeatureDetector::create(40);
    fast->detect(image, keypoints);