Installing opencv + fatal error: 'opencv2/core.hpp' file not found - opencv

Question

I have installed open cv using the official installation process given at:
https://docs.opencv.org/4.5.2/d0/db2/tutorial_macos_install.html
I am doing this on mac and it took ~3 hours for this process. After installation, the installed directory looks like this:
apple#Apples-MacBook-Air.local:~/Learning/openCV/cpp$ pwd
/Users/apple/Learning/openCV/cpp
apple#Apples-MacBook-Air.local:~/Learning/openCV/cpp$ ls
3rdparty CTestTestfile.cmake bin data
opencv_data_config.hpp setup_vars.sh
CMakeCache.txt Makefile cmake_install.cmake doc
opencv_lapack.h test-reports
CMakeDownloadLog.txt OpenCVConfig-version.cmake cmake_uninstall.cmake
include opencv_python_config.cmake tmp
CMakeFiles OpenCVConfig.cmake configured lib
opencv_python_tests.cfg unix-install
CMakeVars.txt OpenCVModules.cmake custom_hal.hpp modules
opencv_tests_config.hpp version_string.tmp
CPackConfig.cmake apps cv_cpu_config.h opencv
python_loader
CPackSourceConfig.cmake basicOp.cpp cvconfig.h opencv2
samples
Now, I am writing a very simple program to test the installation and it looks like that I need to do more things than what I have done so far.
My simple program:
#include<iostream>
#include<opencv2/core.hpp>
int main() {
std::string imagePath = samples.findFile("starry_night.jpg");
cv::Mat imageMatrix = cv::imread(imagePath);
if(imageMatrix.empty()) {
std::cout << "Matrix is empty" << std::endl;
}
}
Compiling this gives error as:
apple#Apples-MacBook-Air.local:~/Learning/openCV/programs$ g++ imageRead.cpp
imageRead.cpp:2:9: fatal error: 'opencv2/core.hpp' file not found
#include<opencv2/core.hpp>
No problem, I can probably understand that due to non-linkage of the open cv libraries.
So, I compiled with:
apple#Apples-MacBook-Air.local:~/Learning/openCV/programs$ g++ imageRead.cpp -I/Users/apple/Learning/openCV/cpp/include -L/Users/apple/Learning/openCV/cpp/lib/
imageRead.cpp:2:9: fatal error: 'opencv2/core.hpp' file not found
#include<opencv2/core.hpp>
And it still give me the same error. Basically, I passed the paths for gcc to consider for linking.
Any suggestions? I can help providing more details on it, if needed.

Answer 1

Did you try #include<opencv2/opencv.hpp> instead of #include<opencv2/core.hpp>?