The character 'cv' cannot be resolved in eclipse

Question

I am trying to configure openCV in eclipse, in the include path I added

/usr/local/include/opencv /usr/local/include 

and I used pkg-config -libs opencv to add the library to GCC C ++ Linker:

 /usr/local/lib/libopencv_calib3d.so /usr/local/lib/libopencv_contrib.so ... 

in the header file i included:

 #include <opencv2/highgui/highgui.hpp> #include <opencv2/core/eigen.hpp> 

but when i announce

 using namespace cv; 

I get an error: Symbol 'cv' could not be resolved

Answer 1

The problem is that the linker cannot find the character named cv .

Suppose you installed everything correctly, i.e. that each file ^[1] is where it should be, because you did not tell the linker which files it should reference.

^{Note Are there actually files listed by pkg-config --libs opencv ?}

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Decision

• Go to your project properties
• click C / C ++ Build
• click Settings
• find GCC C ++ Linker (on the Tool Options tab)
  • click "Libraries"
  • Add OpenCV Libraries.

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DETAILED GUIDE

OpenCV has an official guide for working with Eclipse:

• opencv.org - using OpenCV with Eclipse (CDT plugin)

Answer 2

In the GCC C ++ compiler, you must first include / usr / local / include . See the following image.

Answer 3

You must enable opencv.hpp
go to the GCC C ++ compiler, go to the "Includes" section. In Include File (-l) add / usr / include / opencv2 / opencv.hpp