文档源代码opencv 中的错误error: ‘SurfFeatureDetector’ was not declared in this scope

本篇文章朋友在青岛游玩的时候突然想到的...最近就有想写几篇关于文档源代码的文章，所以回家到之后就奋笔疾书的写出来发布了

    

    这是文档中的源代码,:但是译编的时候会有一下错误:

    error: ‘SurfFeatureDetector’ was not declared in this scope

#include <stdio.h>

#include <iostream>

#include "opencv2/core/core.hpp"

#include "opencv2/features2d/features2d.hpp"

#include "opencv2/highgui/highgui.hpp"



using namespace cv;



void readme();



/** @function main */

int main( int argc, char** argv )

{

  if( argc != 3 )

  { readme(); return -1; }



  Mat img_1 = imread( argv[1], CV_LOAD_IMAGE_GRAYSCALE );

  Mat img_2 = imread( argv[2], CV_LOAD_IMAGE_GRAYSCALE );



  if( !img_1.data || !img_2.data )

  { std::cout<< " --(!) Error reading images " << std::endl; return -1; }



  //-- Step 1: Detect the keypoints using SURF Detector

  int minHessian = 400;



  SurfFeatureDetector detector( minHessian );



  std::vector<KeyPoint> keypoints_1, keypoints_2;



  detector.detect( img_1, keypoints_1 );

  detector.detect( img_2, keypoints_2 );



  //-- Draw keypoints

  Mat img_keypoints_1; Mat img_keypoints_2;



  drawKeypoints( img_1, keypoints_1, img_keypoints_1, Scalar::all(-1), DrawMatchesFlags::DEFAULT );

  drawKeypoints( img_2, keypoints_2, img_keypoints_2, Scalar::all(-1), DrawMatchesFlags::DEFAULT );



  //-- Show detected (drawn) keypoints

  imshow("Keypoints 1", img_keypoints_1 );

  imshow("Keypoints 2", img_keypoints_2 );



  waitKey(0);



  return 0;

  }



  /** @function readme */

  void readme()

  { std::cout << " Usage: ./SURF_detector <img1> <img2>" << std::endl; }

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    加上这两个头文件就能够了.

    

    

#include <opencv2/nonfree/features2d.hpp>

    

#include <opencv2/nonfree/nonfree.hpp>

    

文章结束给大家分享下程序员的一些笑话语录： 古鸽是一种搜索隐禽，在中国快绝迹了…初步的研究表明，古鸽的离去，很可能导致另一种长着熊爪，酷似古鸽，却又习性不同的猛禽类——犤毒鸟