CODEWITHSUNDEEP
c++macosqtopencv
nigui
nigui

Reputation: 31

OpenCV (C++/Qt) - cornerSubPix error

Hello !

I'm having troubles with cornerSubPix method from imgproc.hpp file. I don't understand which library is missing or what's the error. I work with Qt 5.4.1 on OS X 10.10.3, and using OpenCV 3.0.0 C++ library.

Here is my code : 

    #include <opencv2/opencv.hpp>
    #include <opencv2/core/types.hpp>
    #include <opencv2/highgui/highgui.hpp>
    #include <opencv2/imgproc.hpp>
    #include <opencv2/features2d/features2d.hpp>
    #include <vector>
    #include <stdio.h>
    #include "cameraparams.h"
    #include <iostream>

    [...]

    vector< vector <Point2f> > left_2D_points, right_2D_points;

        for( int i=0;i<left_images.size();i++){

            Mat left_image = left_images[i];
            Mat rig

ht_image = right_images[i];
        std::vector<cv::Point2f> left_im_points,right_im_points;

        bool found_left = findChessboardCorners(left_image,Size(width,height),left_im_points,CALIB_CB_ADAPTIVE_THRESH + CALIB_CB_NORMALIZE_IMAGE+ CALIB_CB_FAST_CHECK);
        bool found_right = findChessboardCorners(right_image,Size(width,height),right_im_points,CALIB_CB_ADAPTIVE_THRESH + CALIB_CB_NORMALIZE_IMAGE+ CALIB_CB_FAST_CHECK);

        if( found_left && found_right){
              Size winSize = Size( 7, 7 );
              Size zeroZone = Size( -1, -1 );
              TermCriteria criteria = TermCriteria( TermCriteria::EPS + TermCriteria::MAX_ITER, 40, 0.001 );

              cv::cornerSubPix(left_image,left_im_points,winSize,zeroZone,criteria);

        }

    }

And here is my *.pro file : 

INCLUDEPATH +=  /usr/local/include/ \
                /usr/local/include/pcl-1.7/ \
                /usr/local/include/eigen3/ \
                /usr/local/include/vtk-6.2/

LIBS += -L/usr/local/lib \
        -lopencv_core \
        -lopencv_imgcodecs \
        -lopencv_highgui \
        -lopencv_imgproc \
        -lopencv_objdetect \
        -lopencv_calib3d \
        -lopencv_features2d \
        -lopencv_flann \
        -lopencv_ml \
        -lopencv_photo \
        -lopencv_shape \
        -lopencv_stitching \
        -lopencv_superres \
        -lopencv_ts \
        -lopencv_video \
        -lopencv_videoio \
        -lopencv_videostab

So I want to detect corner more precisely on my checkerboard. But when I'm compiling I get this error : 

Undefined symbols for architecture x86_64:
  "cv::_InputArray::getMatVector(std::vector<cv::Mat, std::allocator<cv::Mat> >&) const", referenced from:
      vtable for cv::_InputOutputArray in calibrator.o
  "cv::_InputArray::getUMatVector(std::vector<cv::UMat, std::allocator<cv::UMat> >&) const", referenced from:
      vtable for cv::_InputOutputArray in calibrator.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Classification] Error 1

I am looking for the answer since several days now, and I'm already blocked. Thank you all in advance for any trail !

Upvotes: 3

Views: 983

Answers (2)

karlphillip
karlphillip

Reputation: 93478

This issue was first reported here. It appears to be related to the version of the C++ standard library that your compiler is using. A few workarounds have been discussed on that thread.

However, another answer on Stackoverflow seems to fix the problem.

Google is your friend.

Upvotes: 0

Shirui Ma
Shirui Ma

Reputation: 33

I had the same problem last time with the same configurations (Mac OS 10.10.3, Qt 5.4.1, OpenCV 3.0). It seems like the compiler clang is not compatible for opencv 3.0.

Using the older version of opencv (for example 2.4.10) may solve the problem.

Have fun and good luck :)

Upvotes: 0

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