opencv中的链接器问题 [英] Linker issue in opencv

问题描述

我在Visual Studio 2012中使用OpenCV 2.4.6，我已经测试了一个示例程序，名称为matcher_simple.cpp - 它匹配两个示例图像，image1和image2。

  #include< stdio.h> 
 #includeopencv2 / core / core.hpp
 #includeopencv2 / features2d / features2d.hpp
 #includeopencv2 / highgui / highgui.hpp
＃ includeopencv2 / nonfree / nonfree.hpp
 #includeopencv2 / opencv.hpp
 
 using namespace cv; 
 
 static void help（）
 {
 printf（\\\
This程序演示使用features2d检测器，描述符提取器和简单matcher \\\

 SURF描述符：\\\

\\\

用法：\\\
 matcher_simple< image1>< image2> \\\
）; 
} 
 
 int main（int argc，char ** argv）
 {
 if（argc！= 3）
 {
 help （）; 
 return -1; 
} 
 
 // cv :: initModule_nonfree（）; 
 Mat img1 = imread（argv [1]，CV_LOAD_IMAGE_GRAYSCALE）; 
 Mat img2 = imread（argv [2]，CV_LOAD_IMAGE_GRAYSCALE）; 
 if（img1.empty（）|| img2.empty（））
 {
 printf（无法读取其中一个images \\\
 
 return -1; 
} 
 
 
 //检测关键点
 SurfFeatureDetector检测器（400）; 
 vector< KeyPoint> keypoints1，keypoints2; 
 detector.detect（img1，keypoints1）; 
 detector.detect（img2，keypoints2）; 
 
 //计算描述符
 SurfDescriptorExtractor提取器; 
 Mat descriptors1，descriptors2; 
 extractor.compute（img1，keypoints1，descriptors1）; 
 extractor.compute（img2，keypoints2，descriptors2）; 
 
 //匹配描述符
 BFMatcher匹配器（NORM_L2）; 
 vector< DMatch>火柴; 
 matcher.match（descriptors1，descriptors2，matches）; 
 
 //绘制结果
 namedWindow（matches，1）; 
 Mat img_matches; 
 drawMatches（img1，keypoints1，img2，keypoints2，matches，img_matches）; 
 imshow（matches，img_matches）; 
 waitKey（0）; 
 
 return 0; 
} 
  

在编译时出现错误：

  1> ------构建开始：项目：opencvreinstated，配置：版本x64 ------ 
 1> matcher_simple.obj：错误LNK2001：未解析的外部符号public：__cdecl cv :: SURF :: SURF（void）（?? 0SURF @ cv @@ QEAA @ XZ）
 1> matcher_simple.obj：error LNK2001：unresolved external symbol public：__cdecl cv :: SURF :: SURF（double，int，int，bool，bool）（?? 0SURF @ cv @@ QEAA @ NHH_N0 @ Z）
 1> C：\Users \motiur \documents\visual studio 2012 \Projects\opencvreinstated\x64\Release\opencvreinstated.exe：致命错误LNK1120：2未解决的外部
 ========== Build：0成功，1个失败，0个最新，0个跳过========== 
  

我已经测试这个在发布模式64位，我也已经成功运行简单的其他opencv示例，例如流式直播视频。我没有这类问题。帮助是赞赏。感谢。

解决方案

您必须链接到nonfree模块，因为这是Surf功能的实现。

转到项目属性 - >链接器 - >输入，并将smth（如opencv_nonfree246d.dll）添加到Additional Dependencies字段。

有关详情，请参阅 http://docs.opencv.org/doc/tutorials/introduction/windows_visual_studio_Opencv/windows_visual_studio_Opencv.html#the-local-method

I am using OpenCV 2.4.6 in Visual Studio 2012 and I have testing one of the sample programs , name matcher_simple.cpp -- which matches two sample images , image1 and image2.

#include <stdio.h>
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/nonfree/nonfree.hpp"
#include "opencv2/opencv.hpp"

using namespace cv;

static void help()
{
    printf("\nThis program demonstrates using features2d detector, descriptor extractor and simple matcher\n"
            "Using the SURF desriptor:\n"
            "\n"
            "Usage:\n matcher_simple <image1> <image2>\n");
}

int main(int argc, char** argv)
{
    if(argc != 3)
    {
        help();
        return -1;
    }

    //cv::initModule_nonfree();
    Mat img1 = imread(argv[1], CV_LOAD_IMAGE_GRAYSCALE);
    Mat img2 = imread(argv[2], CV_LOAD_IMAGE_GRAYSCALE);
    if(img1.empty() || img2.empty())
    {
        printf("Can't read one of the images\n");
        return -1;
    }


    // detecting keypoints
    SurfFeatureDetector detector(400);
    vector<KeyPoint> keypoints1, keypoints2;
    detector.detect(img1, keypoints1);
    detector.detect(img2, keypoints2);

    // computing descriptors
    SurfDescriptorExtractor extractor;
    Mat descriptors1, descriptors2;
    extractor.compute(img1, keypoints1, descriptors1);
    extractor.compute(img2, keypoints2, descriptors2);

    // matching descriptors
    BFMatcher matcher(NORM_L2);
    vector<DMatch> matches;
    matcher.match(descriptors1, descriptors2, matches);

    // drawing the results
    namedWindow("matches", 1);
    Mat img_matches;
    drawMatches(img1, keypoints1, img2, keypoints2, matches, img_matches);
    imshow("matches", img_matches);
    waitKey(0);

    return 0;
}

On compiling I get this error :

1>------ Build started: Project: opencvreinstated, Configuration: Release x64 ------
1>matcher_simple.obj : error LNK2001: unresolved external symbol "public: __cdecl cv::SURF::SURF(void)" (??0SURF@cv@@QEAA@XZ)
1>matcher_simple.obj : error LNK2001: unresolved external symbol "public: __cdecl cv::SURF::SURF(double,int,int,bool,bool)" (??0SURF@cv@@QEAA@NHH_N0@Z)
1>C:\Users\motiur\documents\visual studio 2012\Projects\opencvreinstated\x64\Release\opencvreinstated.exe : fatal error LNK1120: 2 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

I have testing this in release mode 64 bit , I also have successfully ran simple other opencv samples , for example streaming live video . I did not have these sort of issues there . Help is appreciated . Thanks.

解决方案

You have to link in the nonfree module, since this is where the Surf features are implemented.

Go to project Properties -> Linker -> Input, and add smth like opencv_nonfree246d.dll to Additional Dependencies field.

For details, please, see http://docs.opencv.org/doc/tutorials/introduction/windows_visual_studio_Opencv/windows_visual_studio_Opencv.html#the-local-method

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