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For use OpenCV to QT you can create a new project by File>NewFileOrProject>OtherProject>QTConsole Application or File>NewFileOrProject>QTWidgetProject>QTGuiApllication Then Open pro file(untiteld.pro) and add these lines to it.

INCLUDEPATH += C:\OpenCV\build\install\include\
LIBS += -LC:\OpenCV\build\install\lib\
-lopencv_core249 \
-lopencv_highgui249 \
-lopencv_imgproc249 \
-lopencv_features2d249 \
-lopencv_calib3d249

For use the PCL library in QT visit this page.

For use OpenCV to in QT you can create a new project by File>NewFileOrProject>OtherProject>QTConsole Application or File>NewFileOrProject>QTWidgetProject>QTGuiApllication Then Open pro file(untiteld.pro) and add append these lines to it.

INCLUDEPATH += C:\OpenCV\build\install\include\
LIBS += -LC:\OpenCV\build\install\lib\
-lopencv_core249 \
-lopencv_highgui249 \
-lopencv_imgproc249 \
-lopencv_features2d249 \
-lopencv_calib3d249

For use the PCL library in QT visit this page.