OpenCV - 无法使用SurfFeatureDetector类

时间:2012-07-19 09:02:51

标签: c++ opencv

我正在尝试编译一个使用SURF进行图像匹配的示例openCV项目。

下面列出了代码:

#include <stdio.h>
#include <iostream>
#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
//#include "opencv2/core/core.hpp"
//#include "opencv2/features2d/features2d.hpp"
//#include "opencv2/highgui/highgui.hpp"

using namespace cv;

void readme();

/** @function main */
int main()
{
/*
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 );
*/

Mat img_1 = imread("D:\\A.jpg", CV_LOAD_IMAGE_GRAYSCALE);
Mat img_2 = imread("D:\\backImg.jpg", 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;

std::vector<KeyPoint> keypoints_1, keypoints_2;

detector.detect( img_1, keypoints_1 );
detector.detect( img_2, keypoints_2 );

//-- Step 2: Calculate descriptors (feature vectors)
SurfDescriptorExtractor extractor;

Mat descriptors_1, descriptors_2;

extractor.compute( img_1, keypoints_1, descriptors_1 );
extractor.compute( img_2, keypoints_2, descriptors_2 );

//-- Step 3: Matching descriptor vectors using FLANN matcher
FlannBasedMatcher matcher;
std::vector< DMatch > matches;
matcher.match( descriptors_1, descriptors_2, matches );

double max_dist = 0; double min_dist = 100;

//-- Quick calculation of max and min distances between keypoints
for( int i = 0; i < descriptors_1.rows; i++ )
{ double dist = matches[i].distance;
if( dist < min_dist ) min_dist = dist;
if( dist > max_dist ) max_dist = dist;
}

printf("-- Max dist : %f \n", max_dist );
printf("-- Min dist : %f \n", min_dist );

//-- Draw only "good" matches (i.e. whose distance is less than 2*min_dist )
//-- PS.- radiusMatch can also be used here.
std::vector< DMatch > good_matches;

for( int i = 0; i < descriptors_1.rows; i++ )
{ if( matches[i].distance < 2*min_dist )
{ good_matches.push_back( matches[i]); }
}

//-- Draw only "good" matches
Mat img_matches;
drawMatches( img_1, keypoints_1, img_2, keypoints_2,
    good_matches, img_matches, Scalar::all(-1), Scalar::all(-1),
    vector<char>(), DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS );

//-- Show detected matches
imshow( "Good Matches", img_matches );

for( int i = 0; i < good_matches.size(); i++ )
{ printf( "-- Good Match [%d] Keypoint 1: %d  -- Keypoint 2: %d  \n", i,         good_matches[i].queryIdx, good_matches[i].trainIdx ); }

waitKey(0);

return 0;
}

/** @function readme */
void readme()
{ std::cout << " Usage: ./SURF_FlannMatcher <img1> <img2>" << std::endl; }

当我尝试编译时,我收到SurfFeatureDetector的错误作为未声明的标识符。当我右键单击它并转到定义时,它会打开它。我应该包含其他东西吗?它位于feature2d.hpp中,它包含在cv.h文件中。你能帮我解决这个问题吗?

4 个答案:

答案 0 :(得分:5)

只需在头文件中添加Nonfree模块,如果您使用的是opencv 2.4.2,它将解决您的问题。

答案 1 :(得分:1)

您的编译器和编辑器对系统上安装的两个OpenCV版本感到困惑。

首先,确保所有设置(Visual Studio中的包含路径,Visual Studio链接器设置中的 lib 路径和 bin 路径 - 可能是一个环境变量)指向相同的版本。

接下来,请确保包含所有必需的标头。在OpenCV 2.4及更高版本中,SURF和SIFT已移至nonfree模块,因此您还必须安装它。不要忘记某些功能可能会移至legacy

如果您卸载一个版本的OpenCV,编辑器(它没有编译器的所有解析功能)将不再混淆。

答案 2 :(得分:0)

有同样的问题 只包括

#include <opencv2/nonfree/nonfree.hpp>

并解决了。

答案 3 :(得分:0)

我有同样的问题,我执行以下步骤

  • 在程序文件中删除不同版本的opencv。
  • 检查环境变量(opencv版本只有一条和右路)
  • 在我的项目调试文件夹中,我添加“cvextern.dll”和“cvextern_gpu.dll”(添加features2d.dll不够)