undefined reference to `cv::inRange

The error message "undefined reference to cv::inRange" typically occurs in C++ programming when the linker cannot find the definition of the cv::inRange function from the OpenCV library. To resolve this issue, you need to make sure that you have properly linked the OpenCV library in your project.

Here are a few steps you can follow to resolve the issue:

  1. Make sure you have installed the OpenCV library on your system. You can download and install it from the official OpenCV website.

  2. In your C++ code, include the necessary header file for the cv::inRange function. This can be done by adding the following line at the beginning of your code: cpp #include <opencv2/core.hpp>

  3. Link the OpenCV library during the compilation process. This can be done by adding the appropriate linker flags to your build command. For example, if you are using g++, you can use the following command: bash g++ your_code.cpp -o your_executable `pkg-config --cflags --libs opencv`

This command uses the pkg-config tool to retrieve the necessary compiler and linker flags for the OpenCV library.

  1. If you are using an Integrated Development Environment (IDE) such as Visual Studio or Code::Blocks, make sure you have correctly configured the project settings to include the OpenCV library and its dependencies.

By following these steps, you should be able to resolve the "undefined reference to cv::inRange" error and successfully compile your code.