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Opencv how to fill a polyline the python code given below draws a triangle, how can I fill inside? Or other easier way to draw a triangle in OpenCV? pts = np.array([[100,350],[165,350],[165,240]], np.int32) cv2.polylines(img,[pts],True,(0,255,255),2) 1 Answer 1 You have to use cv2.fillPoly() . cv2.fillPoly() Change the second line to: cv2.fillPoly(img, [pts], 255) Illustration: img = np.zeros([400, 400],dtype=np.uint8) pts = np.array([[100,350],[165,350],[165,240]], np.int32) cv2.fillPoly(img, [pts], 255) cv2.imshow('Original', img) Result: By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Compiling OpenCV opencv_world with Qt - unresolved externals I want to compile OpenCV (3.4) with Qt (5.11) (with setting CMake-option WITH_QT and setting Qt5*_DIR paths). The source codes were freshly downloaded from github or Qt-Website. The Solution folder for VC14 is created with the latest CMake. If I compile it with VC14 (Visual Studio 2015 C++) it perfectly compiles and links the single modules. But if I also choose the CMake-option BUILD_opencv_world I get unendless (226) linking errors: "unresolved external symbol ...". All of them related to the project opencv_world. If I remove the CMake-option "WITH_QT" I also can create the opencv_world files. What do I make wrong? Below just a the first entries of the error list: Severity Code Description Project File Line Suppression State Error LNK1120 226 unresolved externals opencv_world D:LIBSopencv-make-VC14binDebugopencv_world341d.dll 1 Error LNK2001 unresolved external symbol "public: stat...