imread not declared in scope (opencv-ecllipse)

Question

Here is a code. when i try to build it in eclipse it says "imread" and almost all functions are not declared in the scope.

    #include <cv.h>
    #include <opencv2/opencv.hpp>
    #include <highgui.h>

    using namespace cv;

    int main( int argc, char** argv )
    {
      Mat image;
      image = imread( "download.jpg",0 );

      if( argc != 2 || !image.data )
        {
          printf( "No image data \n" );
          return -1;
        }

      namedWindow( "Display Image", CV_WINDOW_AUTOSIZE );
      imshow( "Display Image", image );

      waitKey(0);

      return 0;
    }

List of errors are shown below

Description Resource    Path    Location    Type
make: *** [src/DisplayImage1.o] Error 1 DisplayImage            C/C++ Problem
make: *** [display] Error 1 display         C/C++ Problem
‘namedWindow’ was not declared in this scope    DisplayImage1.cpp   /DisplayImage/src   line 23 C/C++ Problem
‘imread’ was not declared in this scope DisplayImage1.cpp   /DisplayImage/src   line 15 C/C++ Problem
‘waitKey’ was not declared in this scope    DisplayImage1.cpp   /DisplayImage/src   line 26 C/C++ Problem
‘imshow’ was not declared in this scope DisplayImage1.cpp   /DisplayImage/src   line 24 C/C++ Problem
undefined reference to `cvRound'    display     line 929, external location: /usr/local/include/opencv2/core/types_c.h  C/C++ Problem
undefined reference to `cvRound'    display     line 930, external location: /usr/local/include/opencv2/core/types_c.h  C/C++ Problem
undefined reference to `cvFree_'    display     line 305, external location: /usr/local/include/opencv2/core/core_c.h   C/C++ Problem
undefined reference to `cvFree_'    display     line 313, external location: /usr/local/include/opencv2/core/core_c.h   C/C++ Problem
undefined reference to `cvGetRows'  display     line 382, external location: /usr/local/include/opencv2/core/core_c.h   C/C++ Problem
undefined reference to `cvGetCols'  display     line 408, external location: /usr/local/include/opencv2/core/core_c.h   C/C++ Problem
undefined reference to `cvReleaseMat'   display     line 477, external location: /usr/local/include/opencv2/core/core_c.h   C/C++ Problem

Don't know what to do. Any idea ?? i am running the code in eclipse.Load opencv library to it.im Using ubuntu. Any help will be appriciated

console message:

make all 
Building file: ../src/DisplayImage.cpp
Invoking: Cross G++ Compiler
g++ -I/usr/local/include/opencv -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/DisplayImage.d" -MT"src/DisplayImage.d" -o "src/DisplayImage.o" "../src/DisplayImage.cpp"
Finished building: ../src/DisplayImage.cpp

Building file: ../src/DisplayImage1.cpp
Invoking: Cross G++ Compiler
g++ -I/usr/local/include/opencv -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/DisplayImage1.d" -MT"src/DisplayImage1.d" -o "src/DisplayImage1.o" "../src/DisplayImage1.cpp"
../src/DisplayImage1.cpp: In function ‘int main(int, char**)’:
../src/DisplayImage1.cpp:15:30: error: ‘imread’ was not declared in this scope
   image = imread( argv[1], 1 );
                              ^
../src/DisplayImage1.cpp:23:52: error: ‘namedWindow’ was not declared in this scope
   namedWindow( "Display Image", CV_WINDOW_AUTOSIZE );
                                                    ^
../src/DisplayImage1.cpp:24:34: error: ‘imshow’ was not declared in this scope
   imshow( "Display Image", image );
                                  ^
../src/DisplayImage1.cpp:26:12: error: ‘waitKey’ was not declared in this scope
   waitKey(0);
            ^
make: *** [src/DisplayImage1.o] Error 1

Answer 1

问题解决只需要在gcc链接器路径中添加一些库

Answer 2

For c/c++:

How to use code completion into Eclipse with OpenCV

For Python:

In Eclipse IDE,

Window -> Preferences -> PyDev -> Interpreters -> Python Interpreter -> Packages -> Manage with pip -> then type ' install cv ' and click Run

now, open Command Prompt and type

pip install opencv-python

now restart your IDE.