OpenCV : undefined reference to imread()
Solution 1
Since OpenCV3, the imread function resides in the imgcodecs module. Imread should work once you add the opencv_imgcodecs
library to your project (note: imgcodecs, not imcodecs).
Solution 2
I recommend to link the following libraries:
opencv_core
opencv_highgui
opencv_imgproc
opencv_imgcodecs
And in the .cpp file, you can include like this
#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
using namespace std;
using namespace cv;
Or
#include <iostream>
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
Solution 3
This function is located in opencv_imgcodecs
library. It also worths mentioning that you may need to put your object file before libraries in order to link successfully:
g++ -c -I/usr/include/opencv4/opencv -I/usr/include/opencv4 main.cpp
g++ main.o -lopencv_imgcodecs $(OTHER_FLAGS) -o main
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Shinchan
Updated on July 09, 2022Comments
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Shinchan almost 2 years
I have configured OpenCV 3.1.0 in Eclipse Mars. These are my configuration,
G++ includes: D:/opencv/build/install/include; GCC includes: D:/opencv/build/install/include
Linker libraries: libopencv_core310, libopencv_highgui310
Linker libraries path: D:/opencv/build/lib (files in this directory are like libopencv_core310.dll.a)
I am getting an error like this,
imageRead.cpp:15: undefined reference to `cv::imread(cv::String const&, int)'
This is my imageRead.cpp file,
#include <iostream> #include "opencv2/core/core.hpp" #include "opencv2/highgui/highgui.hpp" using namespace std; using namespace cv; int main(int argc, const char** argv) { Mat img = imread("D:/sample.jpg", CV_LOAD_IMAGE_UNCHANGED); if (img.empty()) { cout << "Error: Image cannot be loaded." << endl; system("pause"); return -1; } namedWindow("Image Window", CV_WINDOW_AUTOSIZE); imshow("Image Window", img); if (waitKey() == 27) { return -1; } destroyWindow("Image Window"); return 0; }
Can anyone help with this error ?
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Shinchan over 8 yearsIt says "Error starting process: Cannot run program"
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berak over 8 yearsthat's unrelated to your original question.
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Sagar Patel over 8 yearsTry by adding opencv_highgui in linker libray.
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Juan David Torres about 3 yearsThe actual code is #include <opencv2/imgcodecs.hpp>