Qt5.13.2中配置opencv4.5.0踩坑记录
目录
cmake编译opencv时速度过慢或超时
mingw32-make时报错
错误一 [modules\core\CMakeFiles\opencv_core.dir\build.make:1494: modules/core/CMakeFiles/opencv_core.dir/vs_version.rc.obj] Error 1
错误二 [modules\core\CMakeFiles\opencv_core.dir\build.make:1708: bin/libopencv_core450.dll] Error 1
错误三error: 'std::_hypot' has not been declared
在Qt中使用opencv
首先详细阅读参考链接：
OpenCV4.1.1+QT5.13+QtCreater4.9.1+MinGW730 在windows10下的环境搭建教程
官方指南
补充说明
本机使用的各个版本：
- qt 5.13.2
- cmake 3.19.2
- opencv 4.5.0
- win10 64位
上面三篇链接详细地介绍了安装步骤，下面是我的补充说明和踩坑记录：
cmake编译opencv时速度过慢或超时
速度过慢或者超时往往是因为opencv_videoio_ffmpeg.dll 和 opencv_videoio_ffmpeg_64.dll下载失败导致
参考这篇文章：CMake opencv时Download: opencv_ffmpeg.dll、ippicv等失败的解决方法
解决办法：将opencv_videoio_ffmpeg.dll 、 opencv_videoio_ffmpeg_64.dll和face_landmark_model.dat单独下载下来，下载地址。保存在编译后的相应的build文件中：
比如我的opencv的三个文件夹都放在D盘中，名称为：
所以将下载好的dll文件放入D:\opencv_4.5.0-build\3rdparty\ffmpeg中即可
将dat文件放入D:\opencv_4.5.0-build\testdata/cv/face中（需要自己创建该文件夹）
将这三个文件提前下载好放入相应的build文件夹中，可极大地提高编译速度。
cmake编译日志：
General configuration for OpenCV 4.5.0 =====================================Version control: unknownExtra modules:Location (extra): D:/opencv_contrib-4.5.0-source/modulesVersion control (extra): unknownPlatform:Timestamp: 2020-12-19T04:08:17ZHost: Windows 10.0.19042 AMD64CMake: 3.19.2CMake generator: MinGW MakefilesCMake build tool: D:/Mingw-w64/mingw32/bin/mingw32-make.exeConfiguration: ReleaseCPU/HW features:Baseline: SSE SSE2 SSE3requested: SSE3Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKXSSE4_1 (17 files): + SSSE3 SSE4_1SSE4_2 (2 files): + SSSE3 SSE4_1 POPCNT SSE4_2FP16 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVXAVX (5 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVXAVX2 (31 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2C/C++:Built as dynamic libs?: YESC++ standard: 11C++ Compiler: D:/myQT/Tools/mingw730_64/bin/g++.exe (ver 7.3.0)C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUGC++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUGC Compiler: D:/myQT/Tools/mingw730_64/bin/gcc.exeC flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUGC flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUGLinker flags (Release): -Wl,--gc-sections Linker flags (Debug): -Wl,--gc-sections ccache: NOPrecompiled headers: NOExtra dependencies:3rdparty dependencies:OpenCV modules:To be built: aruco bgsegm bioinspired calib3d ccalib core cvv datasets dnn dnn_objdetect dnn_superres dpm face features2d flann fuzzy gapi hfs highgui img_hash imgcodecs imgproc intensity_transform line_descriptor mcc ml objdetect optflow phase_unwrapping photo plot python3 quality rapid reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab xfeatures2d ximgproc xobjdetect xphotoDisabled: worldDisabled by dependency: -Unavailable: alphamat cnn_3dobj cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev freetype hdf java js julia matlab ovis python2 sfm vizApplications: tests perf_tests appsDocumentation: NONon-free algorithms: NOWindows RT support: NOGUI: QT: YES (ver 5.13.2)QT OpenGL support: NOWin32 UI: YESVTK support: NOMedia I/O: ZLib: build (ver 1.2.11)JPEG: build-libjpeg-turbo (ver 2.0.5-62)WEBP: build (ver encoder: 0x020f)PNG: build (ver 1.6.37)TIFF: build (ver 42 - 4.0.10)JPEG 2000: build (ver 2.3.1)OpenEXR: build (ver 2.3.0)HDR: YESSUNRASTER: YESPXM: YESPFM: YESVideo I/O:DC1394: NOFFMPEG: NOavcodec: NOavformat: NOavutil: NOswscale: NOavresample: NOGStreamer: NODirectShow: YESParallel framework: noneTrace: YES (built-in)Other third-party libraries:Lapack: NOEigen: NOCustom HAL: NOProtobuf: build (3.5.1)OpenCL: YES (no extra features)Include path: D:/opencv-4.5.0-source/3rdparty/include/opencl/1.2Link libraries: Dynamic loadcuowu Python 3:Interpreter: D:/Python36/python.exe (ver 3.6.8)Libraries: D:/Python36/libs/libpython36.a (ver 3.6.8)numpy: D:/Python36/lib/site-packages/numpy/core/include (ver 1.14.5)install path: D:/Python36/Lib/site-packages/cv2/python-3.6Python (for build): D:/Python36/python.exeJava: ant: NOJNI: C:/Program Files (x86)/Java/jdk1.8.0_73/include C:/Program Files (x86)/Java/jdk1.8.0_73/include/win32 C:/Program Files (x86)/Java/jdk1.8.0_73/includeJava wrappers: NOJava tests: NOInstall to: D:/opencv_4.5.0-build/install
-----------------------------------------------------------------Configuring done
Generating donemingw32-make时报错
错误一 [modules\core\CMakeFiles\opencv_core.dir\build.make:1494: modules/core/CMakeFiles/opencv_core.dir/vs_version.rc.obj] Error 1
gcc: error: long: No such file or directory
D:\Mingw-w64\mingw32\bin\windres.exe: preprocessing failed.
mingw32-make[2]: *** [modules\core\CMakeFiles\opencv_core.dir\build.make:1494: modules/core/CMakeFiles/opencv_core.dir/vs_version.rc.obj] Error 1
mingw32-make[1]: *** [CMakeFiles\Makefile2:4097: modules/core/CMakeFiles/opencv_core.dir/all] Error 2
mingw32-make: *** [Makefile:181: all] Error 2
解决办法：
将CMake中的 OPENCV/OPENCV_ENABLE_ALLOCATOR_STATS 不打勾
错误二 [modules\core\CMakeFiles\opencv_core.dir\build.make:1708: bin/libopencv_core450.dll] Error 1
D:/myQT/Tools/mingw730_64/bin/../lib/gcc/x86_64-w64-mingw32/7.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: i386 architecture of input file `CMakeFiles\opencv_core.dir/objects.a(vs_version.rc.obj)' is incompatible with i386:x86-64 output
collect2.exe: error: ld returned 1 exit status
mingw32-make[2]: *** [modules\core\CMakeFiles\opencv_core.dir\build.make:1708: bin/libopencv_core450.dll] Error 1
mingw32-make[1]: *** [CMakeFiles\Makefile2:4097: modules/core/CMakeFiles/opencv_core.dir/all] Error 2
mingw32-make: *** [Makefile:181: all] Error 2
设置OPENCV_VS_VERSIONINFO_SKIP=1，也就是打勾，若无法找到变量OPENCV_VS_VERSIONINFO_SKIP，则可以自己添加一个：
错误三error: 'std::_hypot' has not been declared
In file included from D:/Python36/include/Python.h:8:0,
from D:\opencv-4.5.0-source\modules\python\src2\cv2.cpp:17:
D:/myQT/Tools/mingw730_64/lib/gcc/x86_64-w64-mingw32/7.3.0/include/c++/math.h:91:12: error: 'std::_hypot' has not been declared
using std::hypot;
^
mingw32-make[2]: *** [modules\python3\CMakeFiles\opencv_python3.dir\build.make:82: modules/python3/CMakeFiles/opencv_python3.dir/__/src2/cv2.cpp.obj] Error 1
mingw32-make[1]: *** [CMakeFiles\Makefile2:8358: modules/python3/CMakeFiles/opencv_python3.dir/all] Error 2
mingw32-make: *** [Makefile:181: all] Error 2
参考文章：Python写C/C++扩展时，编译报错：error: '::hypot' has not been declared
具体步骤：找到自己报错的目标头文件，我这里是： D:/Python36/include/Python.h，打开并修改Python.h头文件，在文件开头添加#include <math.h>
最后的编译日志
D:\opencv_4.5.0-build>mingw32-make -j1
[ 1%] Built target zlib
[ 4%] Built target libjpeg-turbo
[ 6%] Built target libtiff
[ 11%] Built target libwebp
[ 11%] Built target libopenjp2
[ 12%] Built target libpng
[ 16%] Built target IlmImf
[ 20%] Built target libprotobuf
[ 20%] Built target quirc
[ 21%] Built target ade
[ 21%] Built target opencv_videoio_plugins
[ 26%] Built target opencv_core
[ 30%] Built target opencv_imgproc
[ 31%] Built target opencv_imgcodecs
[ 32%] Built target opencv_videoio
[ 33%] Built target opencv_highgui
[ 34%] Built target opencv_ts
[ 36%] Built target opencv_test_core
[ 37%] Built target opencv_perf_core
[ 37%] Built target opencv_flann
[ 37%] Built target opencv_test_flann
[ 40%] Built target opencv_test_imgproc
[ 41%] Built target opencv_perf_imgproc
[ 41%] Built target opencv_intensity_transform
[ 41%] Built target opencv_test_intensity_transform
[ 42%] Built target opencv_ml
[ 43%] Built target opencv_test_ml
[ 43%] Built target opencv_phase_unwrapping
[ 43%] Built target opencv_test_phase_unwrapping
[ 44%] Built target opencv_photo
[ 44%] Built target opencv_test_photo
[ 44%] Built target opencv_perf_photo
[ 44%] Built target opencv_plot
[ 45%] Built target opencv_quality
[ 45%] Built target opencv_test_quality
[ 45%] Built target opencv_reg
[ 45%] Built target opencv_test_reg
[ 45%] Built target opencv_perf_reg
[ 45%] Built target opencv_surface_matching
[ 46%] Built target opencv_xphoto
[ 47%] Built target opencv_test_xphoto
[ 47%] Built target opencv_perf_xphoto
[ 52%] Built target opencv_dnn
[ 52%] Built target opencv_test_dnn
[ 52%] Built target opencv_perf_dnn
[ 52%] Built target opencv_dnn_superres
[ 53%] Built target opencv_test_dnn_superres
[ 53%] Built target opencv_perf_dnn_superres
[ 54%] Built target opencv_features2d
[ 55%] Built target opencv_test_features2d
[ 56%] Built target opencv_perf_features2d
[ 57%] Built target opencv_fuzzy
[ 57%] Built target opencv_test_fuzzy
[ 57%] Built target opencv_hfs
[ 57%] Built target opencv_img_hash
[ 57%] Built target opencv_test_img_hash
[ 57%] Built target opencv_test_imgcodecs
[ 58%] Built target opencv_perf_imgcodecs
[ 59%] Built target opencv_line_descriptor
[ 59%] Built target opencv_test_line_descriptor
[ 59%] Built target opencv_perf_line_descriptor
[ 60%] Built target opencv_saliency
[ 60%] Built target opencv_test_saliency
[ 60%] Built target opencv_text
[ 60%] Built target opencv_test_text
[ 61%] Built target opencv_test_videoio
[ 61%] Built target opencv_perf_videoio
[ 63%] Built target opencv_calib3d
[ 64%] Built target opencv_test_calib3d
[ 65%] Built target opencv_perf_calib3d
[ 65%] Automatic MOC for target opencv_cvv
[ 65%] Built target opencv_cvv_autogen
[ 68%] Built target opencv_cvv
[ 68%] Automatic MOC for target opencv_test_cvv
[ 68%] Built target opencv_test_cvv_autogen
[ 69%] Built target opencv_test_cvv
[ 71%] Built target opencv_datasets
[ 71%] Built target opencv_test_highgui
[ 71%] Built target opencv_mcc
[ 71%] Built target opencv_test_mcc
[ 71%] Built target opencv_objdetect
[ 71%] Built target opencv_test_objdetect
[ 72%] Built target opencv_perf_objdetect
[ 72%] Built target opencv_rapid
[ 73%] Built target opencv_test_rapid
[ 74%] Built target opencv_rgbd
[ 74%] Built target opencv_test_rgbd
[ 74%] Built target opencv_perf_rgbd
[ 74%] Built target opencv_shape
[ 74%] Built target opencv_test_shape
[ 75%] Built target opencv_structured_light
[ 75%] Built target opencv_test_structured_light
[ 75%] Built target opencv_video
[ 75%] Built target opencv_test_video
[ 76%] Built target opencv_perf_video
[ 77%] Built target opencv_videostab
[ 77%] Built target opencv_test_videostab
[ 78%] Built target opencv_xfeatures2d
[ 78%] Built target opencv_test_xfeatures2d
[ 78%] Built target opencv_perf_xfeatures2d
[ 80%] Built target opencv_ximgproc
[ 81%] Built target opencv_test_ximgproc
[ 82%] Built target opencv_perf_ximgproc
[ 82%] Built target opencv_xobjdetect
[ 82%] Built target opencv_waldboost_detector
[ 82%] Built target opencv_aruco
[ 83%] Built target opencv_test_aruco
[ 83%] Built target opencv_bgsegm
[ 83%] Built target opencv_test_bgsegm
[ 84%] Built target opencv_bioinspired
[ 84%] Built target opencv_test_bioinspired
[ 84%] Built target opencv_perf_bioinspired
[ 84%] Built target opencv_ccalib
[ 84%] Built target opencv_dnn_objdetect
[ 84%] Built target opencv_dpm
[ 85%] Built target opencv_face
[ 85%] Built target opencv_test_face
[ 88%] Built target opencv_gapi
[ 92%] Built target opencv_test_gapi
[ 92%] Built target opencv_perf_gapi
[ 93%] Built target opencv_optflow
[ 94%] Built target opencv_test_optflow
[ 94%] Built target opencv_perf_optflow
[ 94%] Built target opencv_stitching
[ 95%] Built target opencv_test_stitching
[ 95%] Built target opencv_perf_stitching
[ 95%] Built target opencv_superres
[ 95%] Built target opencv_test_superres
[ 95%] Built target opencv_perf_superres
[ 97%] Built target opencv_tracking
[ 98%] Built target opencv_test_tracking
[ 98%] Built target opencv_perf_tracking
[ 99%] Built target opencv_stereo
[ 99%] Built target opencv_test_stereo
[100%] Built target opencv_perf_stereo
[100%] Built target gen_opencv_python_source
Scanning dependencies of target opencv_python3
[100%] Building CXX object modules/python3/CMakeFiles/opencv_python3.dir/__/src2/cv2.cpp.obj
In file included from D:/opencv-4.5.0-source/modules/gapi/include/opencv2/gapi/own/mat.hpp:14:0,from D:/opencv-4.5.0-source/modules/gapi/include/opencv2/gapi/garg.hpp:15,from D:/opencv-4.5.0-source/modules/gapi/include/opencv2/gapi/gcall.hpp:11,from D:/opencv-4.5.0-source/modules/gapi/include/opencv2/gapi/gkernel.hpp:20,from D:/opencv-4.5.0-source/modules/gapi/include/opencv2/gapi/core.hpp:19,from D:/opencv_4.5.0-build/modules/python_bindings_generator/pyopencv_generated_include.h:144,from D:\opencv-4.5.0-source\modules\python\src2\cv2.cpp:38:
D:/opencv-4.5.0-source/modules/gapi/include/opencv2/gapi/own/saturate.hpp:71:0: warning: ignoring #pragma warning [-Wunknown-pragmas]#pragma warning(disable: 4244)D:/opencv-4.5.0-source/modules/gapi/include/opencv2/gapi/own/saturate.hpp:75:0: warning: ignoring #pragma warning [-Wunknown-pragmas]#pragma warning(default: 4244)[100%] Linking CXX shared module ..\..\lib\python3\cv2.cp36-win_amd64.pyd
[100%] Built target opencv_python3
[100%] Built target opencv_annotation
[100%] Built target opencv_visualisation
[100%] Built target opencv_interactive-calibration
[100%] Built target opencv_version
[100%] Built target opencv_version_win32
最后出现这句：[100%] Built target opencv_version_win32，就说明编译成功了
补充说明：在mingw32-make之后加上 -j4 （使用四个线程，数字可以自己改）确实可以提高编译速度。
mingw32-make -j4
但是有一次跑到【100%】提示出错
[100%] Built target opencv_test_gapi
mingw32-make: *** [all] Error 2
却没有提示错误信息，考虑将线程数改为1：
mingw32-make -j1
之后错误信息可以被打印出来，推测可能是速度太快导致错误信息还没来得及打印，程序就退出了，所以当遇到编译的错误信息没有打印出来时（只提示Error），考虑将线程数置为1
在Qt中使用opencv
在文章开头的第一篇文章OpenCV4.1.1+QT5.13+QtCreater4.9.1+MinGW730 在windows10下的环境搭建教程中最后提到的加载dll文件时的方法并不适合不同版本的opencv，
INCLUDEPATH += $$(OPENCV_SDK_DIR)/include
LIBS += -L$$(OPENCV_SDK_DIR)/x64/mingw/lib \
-lopencv_core411 \
-lopencv_highgui411 \
-lopencv_imgcodecs411 \
-lopencv_imgproc411 \
-lopencv_features2d411 \
-lopencv_calib3d411
上面这段代码的意思就是添加include文件夹和依赖库文件。也就是：
D:\opencv_4.5.0-build\install\include\opencv2
D:\opencv_4.5.0-build\install\x64\mingw\lib
这两个文件夹中的内容。
其中以411结尾是因为那篇文章的作者使用的是opencv4.1.1，而我使用的是opencv4.5.0，所以我的依赖库文件是以450结尾的。
知道了原理，我们就可以直接在pro文件中添加这两个文件夹：
INCLUDEPATH += D:\opencv_4.5.0-build\install\include LIBS += D:\opencv_4.5.0-build\install\x64\mingw\bin\libopencv_*.dll
QT += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++11# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \mainwindow.cppHEADERS += \mainwindow.hFORMS += \mainwindow.uiINCLUDEPATH += D:\opencv_4.5.0-build\install\include
LIBS += D:\opencv_4.5.0-build\install\x64\mingw\bin\libopencv_*.dll# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
最后一点要注意，
#include<opencv2/opencv.hpp>using namespace cv;
在添加头文件之后，一定要使用opencv的命名空间using namespace cv; 否则会导致opencv中的变量类型和函数名无法被识别。
编译成功的opencv动态链接库：cmake_opencv450_mingw73_64_编译生成的动态链接库文件_install.zip
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