OpenCV使用CMake和MinGW-w64的編譯安裝
前言
而這篇博文是使用 64 位的 MinGW 編譯 OpenCV 生成 64 位的 dll。
因為博主沒有 64 位 qmake,所以沒勾選 WITH_QT
編譯好的 OpenCV(MinGW 版):
軟體環境
安裝 MinGW-w64 並配置環境變數
為系統(使用者)變數 Path
新增 E:\MinGW-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\bin
使用 CMake 生成 OpenCV 的 Makefile
開啟 cmake-gui,設定原始碼和生成路徑:
- Where is the source code:
E:/opencv_341/opencv/sources
- Where to build the binaries:
E:/opencv_341/opencv_mingw64_build
點選 Configure,設定編譯器
- Specify the generator for this project:
MinGW Makefiles
- Specify native compilers
- Next
- Compilers C:
E:\MinGW-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\bin\gcc.exe
- Compilers C++:
E:\MinGW-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\bin\g++.exe
- Finish
編譯配置:
- 勾選
WITH_OPENGL
- 勾選
ENABLE_CXX11
- 不勾選
WITH_IPP
- 不勾選
ENABLE_PRECOMPILED_HEADERS
點選 Configure,Generate 生成 Makefile
博主的配置資訊如下:
General configuration for OpenCV 3.4.1 ===================================== Version control: unknown Platform: Timestamp: 2018-07-31T02:14:11Z Host: Windows 10.0.17134 AMD64 CMake: 3.12.0 CMake generator: MinGW Makefiles CMake build tool: E:/MinGW-w64/x64-4.8.1-release-posix-seh-rev5/mingw64/bin/mingw32-make.exe Configuration: Release CPU/HW features: Baseline: SSE SSE2 SSE3 requested: SSE3 Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX SSE4_1 (3 files): + SSSE3 SSE4_1 SSE4_2 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 (2 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX AVX (5 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX AVX2 (9 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 C/C++: Built as dynamic libs?: YES C++11: YES C++ Compiler: E:/MinGW-w64/x64-4.8.1-release-posix-seh-rev5/mingw64/bin/g++.exe (ver 4.8.1) 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 -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG C++ 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 -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -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_DEBUG C Compiler: E:/MinGW-w64/x64-4.8.1-release-posix-seh-rev5/mingw64/bin/gcc.exe 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 -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG C 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-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG Linker flags (Release): -Wl,--gc-sections Linker flags (Debug): -Wl,--gc-sections ccache: NO Precompiled headers: NO Extra dependencies: opengl32 glu32 3rdparty dependencies: OpenCV modules: To be built: calib3d core dnn features2d flann highgui imgcodecs imgproc java_bindings_generator ml objdetect photo python_bindings_generator shape stitching superres ts video videoio videostab Disabled: js world Disabled by dependency: - Unavailable: cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java python2 python3 viz Applications: tests perf_tests apps Documentation: NO Non-free algorithms: NO Windows RT support: NO GUI: Win32 UI: YES OpenGL support: YES (opengl32 glu32) VTK support: NO Media I/O: ZLib: build (ver 1.2.11) JPEG: build (ver 90) WEBP: build (ver encoder: 0x020e) PNG: build (ver 1.6.34) TIFF: build (ver 42 - 4.0.9) JPEG 2000: build (ver 1.900.1) OpenEXR: build (ver 1.7.1) Video I/O: Video for Windows: YES DC1394: NO FFMPEG: YES (prebuilt binaries) avcodec: YES (ver 57.107.100) avformat: YES (ver 57.83.100) avutil: YES (ver 55.78.100) swscale: YES (ver 4.8.100) avresample: YES (ver 3.7.0) GStreamer: NO DirectShow: YES Parallel framework: none Trace: YES (built-in) Other third-party libraries: Lapack: NO Eigen: NO Custom HAL: NO Protobuf: build (3.5.1) NVIDIA CUDA: NO OpenCL: YES (no extra features) Include path: E:/opencv_341/opencv/sources/3rdparty/include/opencl/1.2 Link libraries: Dynamic load Python (for build): E:/Python37-32/python.exe Java: ant: NO JNI: C:/Program Files (x86)/Java/jdk1.8.0_181/include C:/Program Files (x86)/Java/jdk1.8.0_181/include/win32 C:/Program Files (x86)/Java/jdk1.8.0_181/include Java wrappers: NO Java tests: NO Matlab: NO Install to: E:/opencv_341/opencv_mingw64_build/install ----------------------------------------------------------------- Configuring done Generating done
編譯 OpenCV
開啟終端進行編譯:(-j
是使用 8
個執行緒進行編譯,請根據你的計算機配置合理設定執行緒數)
E:
cd E:\opencv_341\opencv_mingw64_build
mingw32-make -j 8
mingw32-make install
如果 mingw32-make -j 8
遇到錯誤,請看下面的 編譯 OpenCV 常見錯誤,否則執行 mingw32-make install
,完成安裝。
編譯 OpenCV 常見錯誤
1. MinGW-w64 的 aviriff.h 檔案註釋錯誤
表現
[ 49%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_dshow.cpp.obj
In file included from E:\opencv_341\opencv\sources\modules\videoio\src\cap_dshow.cpp:113:0:
e:\mingw-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\x86_64-w64-mingw32\include\aviriff.h:2:8: error: expected constructor, destructor, or type conversion before 'file'
* This file is part of the mingw-w64 runtime package.
^
e:\mingw-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\x86_64-w64-mingw32\include\aviriff.h:3:25: error: 'refer' does not name a type
* No warranty is given; refer to the file DISCLAIMER within this package.
^
In file included from e:\mingw-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\x86_64-w64-mingw32\include\aviriff.h:19:0,
from E:\opencv_341\opencv\sources\modules\videoio\src\cap_dshow.cpp:113:
e:\mingw-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\x86_64-w64-mingw32\include\pshpack2.h:7:21: error: expected declaration before end of line
#pragma pack(push,2)
^
modules\videoio\CMakeFiles\opencv_videoio.dir\build.make:146: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_dshow.cpp.obj' failed
mingw32-make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_dshow.cpp.obj] Error 1
CMakeFiles\Makefile2:3057: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/all' failed
mingw32-make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
Makefile:161: recipe for target 'all' failed
mingw32-make: *** [all] Error 2
解決
開啟E:\MinGW-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\x86_64-w64-mingw32\include\aviriff.h
發現第一行的多行註釋少了個/
符號,加上儲存,如下:
/**
* This file is part of the mingw-w64 runtime package.
* No warranty is given; refer to the file DISCLAIMER within this package.
*/
然後重新 Configure
-Generate
-mingw32-make
就好了。
2. cap_msmf.cpp capture code 錯誤【2018年10月13日修改,因編譯 OpenCV-4.0.0-alpha 時遇到並解決】
表現
......
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp: In member function 'HRESULT {anonymous}::ComPtr<T>::As({anonymous}::ComPtr<U>&) const [with U = IMF2DBuffer; T = IMFMediaBuffer; HRESULT = long int]':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp:172:5: error: control reaches end of non-void function [-Werror=return-type]
}
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp: In member function 'T* {anonymous}::ComPtr<T>::operator->() const [with T = IMF2DBuffer]':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp:149:5: error: control reaches end of non-void function [-Werror=return-type]
}
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp: In member function 'T* {anonymous}::ComPtr<T>::operator->() const [with T = IMFMediaBuffer]':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp:149:5: error: control reaches end of non-void function [-Werror=return-type]
}
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp: In member function 'T* {anonymous}::ComPtr<T>::operator->() const [with T = IMFSinkWriter]':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp:149:5: error: control reaches end of non-void function [-Werror=return-type]
}
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp: In member function 'T* {anonymous}::ComPtr<T>::Get() const [with T = IMFMediaBuffer]':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp:158:5: error: control reaches end of non-void function [-Werror=return-type]
}
^
cc1plus.exe: some warnings being treated as errors
modules\videoio\CMakeFiles\opencv_videoio.dir\build.make:188: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_msmf.cpp.obj' failed
mingw32-make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_msmf.cpp.obj] Error 1
CMakeFiles\Makefile2:2556: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/all' failed
mingw32-make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
mingw32-make[1]: *** Waiting for unfinished jobs....
[ 58%] Linking CXX shared library ..\..\bin\libopencv_dnn400.dll
[ 59%] Built target opencv_dnn
Makefile:161: recipe for target 'all' failed
mingw32-make: *** [all] Error 2
原因
解決
所以,在 cmake-gui 編譯配置中:
- 不勾選
WITH_MSMF
然後重新 Configure
-Generate
-mingw32-make
3. ‘M_PI’ was not declared in this scope 錯誤【2018年10月13日修改,因編譯 OpenCV-4.0.0-alpha 時遇到並解決】
表現
[ 86%] Building CXX object modules/calib3d/CMakeFiles/opencv_calib3d.dir/src/chessboard.cpp.obj
In file included from E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:7:0:
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.hpp: In constructor 'cv::details::FastX::Parameters::Parameters()':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.hpp:35:36: error: 'M_PI' was not declared in this scope
resolution = float(M_PI*0.25);
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: At global scope:
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:25:42: error: 'M_PI' was not declared in this scope
const float MAX_ANGLE = float(48.0/180.0*M_PI); // max angle between line segments supposed to be straight
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:26:48: error: 'M_PI' was not declared in this scope
const float MIN_COS_ANGLE = float(cos(35.0/180*M_PI)); // min cos angle between board edges
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:29:35: error: 'M_PI' was not declared in this scope
const float RAD2DEG = float(180.0/M_PI);
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In function 'int cv::details::testPointSymmetry(cv::Mat, cv::Point2f, float, float)':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:217:33: error: 'M_PI' was not declared in this scope
for(double angle=0;angle <= M_PI;angle+=M_PI*0.1)
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In member function 'void cv::details::FastX::rotate(float, const cv::Mat&, cv::Size, cv::Mat&) const':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:287:110: error: 'M_PI' was not declared in this scope
cv::Mat m = cv::getRotationMatrix2D(cv::Point2f(float(img.cols*0.5),float(img.rows*0.5)),float(angle/M_PI*180),1);
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In member function 'std::vector<std::vector<float> > cv::details::FastX::calcAngles(const std::vector<cv::Mat>&, std::vector<cv::KeyPoint>&) const':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:393:30: error: 'M_PI' was not declared in this scope
float resolution = float(M_PI/channels);
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In member function 'void cv::details::FastX::detectImpl(const cv::Mat&, std::vector<cv::Mat>&, std::vector<cv::Mat>&, const cv::Mat&) const':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:631:30: error: 'M_PI' was not declared in this scope
int num = int(0.5001*M_PI/parameters.resolution);
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In member function 'void cv::details::Ellipse::draw(cv::InputOutputArray, const Scalar&) const':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:721:43: error: 'M_PI' was not declared in this scope
cv::ellipse(img,center,axes,360-angle/M_PI*180,0,360,color);
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In static member function 'static float cv::details::Chessboard::Board::findMaxPoint(cv::flann::Index&, const cv::Mat&, const cv::details::Ellipse&, float, float, cv::Point2f&)':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:1541:17: error: 'M_PI' was not declared in this scope
if(a1 > M_PI*0.5)
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:1543:16: error: 'M_PI' was not declared in this scope
if(a2> M_PI*0.5)
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In static member function 'static bool cv::details::Chessboard::Board::estimateSearchArea(const Point2f&, const Point2f&, const Point2f&, float, cv::details::Ellipse&, const Point2f*)':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:1787:28: error: 'M_PI' was not declared in this scope
angle = float(2.0F*M_PI-angle);
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In member function 'void cv::details::Chessboard::findKeyPoints(const cv::Mat&, std::vector<cv::KeyPoint>&, std::vector<cv::Mat>&, std::vector<std::vector<float> >&, const cv::Mat&) const':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:2793:29: error: 'M_PI' was not declared in this scope
para.resolution = float(M_PI*0.25); // this gives the best results taking interpolation into account
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In member function 'cv::Mat cv::details::Chessboard::buildData(const std::vector<cv::KeyPoint>&) const':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:2844:30: error: 'M_PI' was not declared in this scope
(*val++) = float(2.0*M_PI-iter->angle/180.0*M_PI);
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In member function 'std::vector<cv::KeyPoint> cv::details::Chessboard::getInitialPoints(cv::flann::Index&, const cv::Mat&, const cv::KeyPoint&, float, float, float) const':
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:2874:25: error: 'M_PI' was not declared in this scope
if(angle_temp > M_PI*0.5)
^
E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:2879:29: error: 'M_PI' was not declared in this scope
if(angle_temp > M_PI*0.5)
^
modules\calib3d\CMakeFiles\opencv_calib3d.dir\build.make:137: recipe for target 'modules/calib3d/CMakeFiles/opencv_calib3d.dir/src/chessboard.cpp.obj' failed
mingw32-make[2]: *** [modules/calib3d/CMakeFiles/opencv_calib3d.dir/src/chessboard.cpp.obj] Error 1
CMakeFiles\Makefile2:3018: recipe for target 'modules/calib3d/CMakeFiles/opencv_calib3d.dir/all' failed
mingw32-make[1]: *** [modules/calib3d/CMakeFiles/opencv_calib3d.dir/all] Error 2
Makefile:161: recipe for target 'all' failed
mingw32-make: *** [all] Error 2
原因
因為 OpenCV 在 chessboard.cpp
、chessboard.hpp
、test_chesscorners.cpp
這些程式碼中有 BUG,使用的應該是 CV_PI
而不是 M_PI
導致的。具體見我提的 Issue:Failed to compile opencv-4.0.0-alpha using mingw-w64
解決
-
在最新的 master 分支已經解決了這個問題,見我的 PR:M_PI changed to CV_PI
-
如果你是在 官網 或者 github.com/opencv/opencv/releases 中下的
OpenCV 4.0.0-alpha
,可能還會有這個問題,那麼你需要把chessboard.cpp
、chessboard.hpp
、test_chesscorners.cpp
檔案中的M_PI
全部改為CV_PI
,如我的 commit 所示:M_PI changed to CV_PI (#12645)
然後重新 Configure
-Generate
-mingw32-make
4. ‘posix_memalign’ was not declared in this scope 錯誤【2018年11月17日修改,因編譯 OpenCV-4.0.0-rc 時遇到並解決】
表現
[ 28%] Building CXX object modules/CMakeFiles/ade.dir/__/3rdparty/ade/ade-0.1.1c/sources/ade/source/alloc.cpp.obj
E:\opencv-4.0.0-rc\opencv-4.0.0-rc-build\3rdparty\ade\ade-0.1.1c\sources\ade\source\alloc.cpp: In function 'void* ade::aligned_alloc(std::size_t, std::size_t)':
E:\opencv-4.0.0-rc\opencv-4.0.0-rc-build\3rdparty\ade\ade-0.1.1c\sources\ade\source\alloc.cpp:31:16: error: 'posix_memalign' was not declared in this scope
auto res = posix_memalign(&ret, std::max(sizeof(void*), alignment), size);
^~~~~~~~~~~~~~
mingw32-make[2]: *** [modules\CMakeFiles\ade.dir\build.make:63: modules/CMakeFiles/ade.dir/__/3rdparty/ade/ade-0.1.1c/sources/ade/source/alloc.cpp.obj] Error 1
mingw32-make[1]: *** [CMakeFiles\Makefile2:884: modules/CMakeFiles/ade.dir/all] Error 2
mingw32-make: *** [Makefile:162: all] Error 2
原因
解決
把 opencv-4.0.0-rc-build\3rdparty\ade\ade-0.1.1c\sources\ade\source\alloc.cpp
檔案的所有 WIN32
改為 _WIN32
,如這個 PR 所做的修改:fix check for win32 #6
然後重新 Configure
-Generate
-mingw32-make
其他錯誤
如果以上錯誤不是你所遇到的,請務必先看下面兩個文章中的錯誤。
更新日誌
- 2018年10月13日為 OpenCV-4.0.0-alpha 而修改,主要改了 “編譯 OpenCV 常見錯誤”
- 2018年11月17日為 OpenCV-4.0.0-rc 而修改,主要改了 “編譯 OpenCV 常見錯誤”