fatal error: opencv2/opencv_modules.hpp: No such file or directory #include "opencv2/opencv_modules.hpp"

Question

Hello all I am trying to use opencv-c++ API (version 4.4.0) which I have built from source. It is installed in /usr/local/ and I was simply trying to load and display an image using the following code -

#include <iostream>
#include <opencv4/opencv2/opencv.hpp>
#include <opencv4/opencv2/core.hpp>
#include <opencv4/opencv2/imgcodecs.hpp>
#include <opencv4/opencv2/highgui.hpp>
#include <opencv4/opencv2/core/cuda.hpp>

using namespace cv;

int main()
{
    std::string image_path = "13.jpg";
    cv::Mat img = cv::imreadmulti(image_path, IMREAD_COLOR);
    if(img.empty())
    {
        std::cout<<"COULD NOT READ IMAGE"<<std::endl;
        return 1;
    }
    imshow("Display Window", img);
    return 0;
}

And when I compile it throws the following error during compilation -

In file included from /CLionProjects/opencvTest/main.cpp:2:
/usr/local/include/opencv4/opencv2/opencv.hpp:48:10: fatal error: opencv2/opencv_modules.hpp: No such file or directory
 #include "opencv2/opencv_modules.hpp"

My Cmake is as follows -

cmake_minimum_required(VERSION 3.15)
project(opencvTest)

set(CMAKE_CXX_STANDARD 17)
include_directories("/usr/local/include/opencv4/opencv2/")
add_executable(opencvTest main.cpp)
target_link_libraries(opencvTest PUBLIC "/usr/local/lib/")

I do not know what am I doing wrong here.. This might be a noob question, But I ahev just started using opencv in C++

You need /usr/local/include/opencv4 to be in your include directories not /usr/local/include/opencv4/opencv2 — drescherjm
– drescherjm, Commented Aug 17, 2020 at 17:13
Taking a guess, your path is incorrect. try this include_directories("/usr/local/include/"). You shouldn't have opencv4/opencv2 in both your include path and in your include directives. The include directive starts where the include path stops. — john
– john, Commented Aug 17, 2020 at 17:14
@john the error I think is actually generated in opencv4/opencv2/opencv.hpp where it is not able to find "opencv_modules" even though they are in the same directory. I tried your suggestion as well and it did not work, however I do not think it would actually make a difference.. I may be wrong about it though — ad99
– ad99, Commented Aug 17, 2020 at 17:38
What worked for me was: sudo cp -r /usr/local/include/opencv4/opencv2 /usr/include/ — Owl
– Owl, Commented Apr 12, 2021 at 16:12
@Owl your suggestions works. I got a second suggestion, who helped me too. Add in the tasks.json the following at "args:" "-I/usr/local/include/opencv4", — EE_G_RLP
– EE_G_RLP, Commented Mar 21, 2023 at 14:43

ad99 · Accepted Answer · 2020-08-17 17:51:57Z

18

The solution is to just include_directories path till /usr/local/opencv4 and it works perfectly.

However, the best way I believe is to use the find_package function. I updated my Cmake to the following and it takes care of linking during build.

cmake_minimum_required(VERSION 3.15)
project(opencvTest)

set(CMAKE_CXX_STANDARD 17)
find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
add_executable(opencvTest main.cpp)
target_link_libraries(opencvTest ${OpenCV_LIBS})

answered Aug 17, 2020 at 17:51

ad99

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3 Comments

drescherjm Over a year ago

This is indeed a better and more proper CMake solution.

Kris Stern Over a year ago

Thanks for this answer! It is exactly what I have been looking for for hours...

Jaeyoung Lee Over a year ago

Thanks! In my case, "include_directories(${OpenCV_INCLUDE_DIRS})" did worked!

Evx · Accepted Answer · 2021-03-23 15:23:55Z

1

#include <opencv2/opencv.hpp>

it should look like that.

relatively, the header search paths should be: /usr/local/include/opencv4

answered Mar 23, 2021 at 15:23

Evx

211 bronze badge

1 Comment

Pawara Siriwardhane Over a year ago

Please, use proper code formatting options available in StackOverflow editor when publishing an answer or a question.

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