Error when I build

[fightmoney]

/home/amov/LineDetector/ED_Lib/video_test.cpp: In function ‘int main(int, const char**)’: /home/amov/LineDetector/ED_Lib/video_test.cpp:35:13: error: ‘EdgeDrawing’ was not declared in this scope Ptr<EdgeDrawing> ed = createEdgeDrawing(); ^~~~~~~~~~~ /home/amov/LineDetector/ED_Lib/video_test.cpp:35:24: error: template argument 1 is invalid Ptr<EdgeDrawing> ed = createEdgeDrawing(); ^ /home/amov/LineDetector/ED_Lib/video_test.cpp:35:31: error: ‘createEdgeDrawing’ was not declared in this scope Ptr<EdgeDrawing> ed = createEdgeDrawing(); ^~~~~~~~~~~~~~~~~ /home/amov/LineDetector/ED_Lib/video_test.cpp:36:11: error: base operand of ‘->’ is not a pointer ed->params.EdgeDetectionOperator = EdgeDrawing::SOBEL; ^~ /home/amov/LineDetector/ED_Lib/video_test.cpp:36:44: error: ‘EdgeDrawing’ is not a class, namespace, or enumeration ed->params.EdgeDetectionOperator = EdgeDrawing::SOBEL; ^~~~~~~~~~~ /home/amov/LineDetector/ED_Lib/video_test.cpp:37:11: error: base operand of ‘->’ is not a pointer ed->params.GradientThresholdValue = 36; ^~ /home/amov/LineDetector/ED_Lib/video_test.cpp:38:11: error: base operand of ‘->’ is not a pointer ed->params.AnchorThresholdValue = 8; ^~ /home/amov/LineDetector/ED_Lib/video_test.cpp:54:15: error: base operand of ‘->’ is not a pointer ed->detectEdges(gray); ^~ /home/amov/LineDetector/ED_Lib/video_test.cpp:55:15: error: base operand of ‘->’ is not a pointer ed->detectLines(lines); ^~ /home/amov/LineDetector/ED_Lib/video_test.cpp:56:15: error: base operand of ‘->’ is not a pointer ed->detectEllipses(ellipses); ^~ CMakeFiles/video_test.dir/build.make:62: recipe for target 'CMakeFiles/video_test.dir/video_test.cpp.o' failed make[2]: *** [CMakeFiles/video_test.dir/video_test.cpp.o] Error 1 so there may some problem with EdgeDrawing,but I can`t find it in the source How to do it? Thanks

[Zhuliang1]

i meet the same problem

[weiningwei]

I also meet the same problem. And I changed the OpenCV version to 4.5.2, then can build successfully.