How to use OpenCV library in a Qt Project

• Build platform specific OpenCV libraries

  • For Mac,
    • Download Source archieve from from OpenCV website https://opencv.org/releases/.
    • Refer https://docs.opencv.org/4.x/d0/db2/tutorial_macos_install.html
    • To use OpenCV in your CMake-based projects through find_package(OpenCV) specify OpenCV_DIR=<path_to_installed_directory> variable.

• OpenCV configuration in CMakeLists.txt file.

  • Add following line,

  find_package(OpenCV 4 REQUIRED) 
  • Add ${OpenCV_LIBS} in target_link_libraries as shown below,

  target_link_libraries(ImageProcessing PRIVATE Qt${QT_VERSION_MAJOR}::Widgets ${OpenCV_LIBS})
  • Set OpenCV_DIR environment variable using

  set("OpenCV_DIR" "/Users/username/Library/Frameworks/SDL2.framework/")