Cmake+Opencv+mingw+QT环境配置

一、下载

  • cmake 3.17.1
  • opencv 4.2.0
  • qt 5.12.2
  • mingw 7.3.0 (64bit)

二、编译Opencv

  1. 创建一个newbuild文件夹
    image
  2. 选定sources文件夹和newbuild文件夹所在位置
    image
  3. 勾选WITH_QT的选项和QT安装的位置（位置建议手动设置，如果有多个版本的QT可能会出问题）
    image
  4. 点击configure，设置编译器为本地的Mingw
Detected processor: AMD64
AVX_512F is not supported by C++ compiler
AVX512_COMMON is not supported by C++ compiler
AVX512_SKX is not supported by C++ compiler
Dispatch optimization AVX512_SKX is not available, skipped
libjpeg-turbo: VERSION = 2.0.2, BUILD = opencv-4.2.0-libjpeg-turbo
Could not find OpenBLAS include. Turning OpenBLAS_FOUND off
Could not find OpenBLAS lib. Turning OpenBLAS_FOUND off
Could NOT find BLAS (missing: BLAS_LIBRARIES) 
LAPACK requires BLAS
A library with LAPACK API not found. Please specify library location.
VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file
OpenCV Python: during development append to PYTHONPATH: D:/Software/opencv2/opencv/newbuild/python_loader
Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.avx512_skx.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin256.avx512_skx.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin512.avx512_skx.cpp
Excluding from source files list: modules/imgproc/src/sumpixels.avx512_skx.cpp
Registering hook 'INIT_MODULE_SOURCES_opencv_dnn': D:/Software/opencv2/opencv/sources/modules/dnn/cmake/hooks/INIT_MODULE_SOURCES_opencv_dnn.cmake
opencv_dnn: filter out cuda4dnn source code
Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx512_skx.cpp

General configuration for OpenCV 4.2.0 =====================================
  Version control:               unknown

  Platform:
    Timestamp:                   2021-05-18T15:58:23Z
    Host:                        Windows 10.0.18363 AMD64
    CMake:                       3.17.1
    CMake generator:             MinGW Makefiles
    CMake build tool:            D:/Software/QT/Tools/mingw730_64/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 (16 files):         + SSSE3 SSE4_1
      SSE4_2 (2 files):          + SSSE3 SSE4_1 POPCNT SSE4_2
      FP16 (1 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
      AVX (5 files):             + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
      AVX2 (29 files):           + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2

  C/C++:
    Built as dynamic libs?:      YES
    C++ Compiler:                D:/Software/QT/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  -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 -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_DEBUG
    C Compiler:                  D:/Software/QT/Tools/mingw730_64/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-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  -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-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_DEBUG
    Linker flags (Release):      -Wl,--gc-sections  
    Linker flags (Debug):        -Wl,--gc-sections  
    ccache:                      NO
    Precompiled headers:         NO
    Extra dependencies:
    3rdparty dependencies:

  OpenCV modules:
    To be built:                 calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo python3 stitching ts video videoio
    Disabled:                    world
    Disabled by dependency:      -
    Unavailable:                 java js python2
    Applications:                tests perf_tests apps
    Documentation:               NO
    Non-free algorithms:         NO

  Windows RT support:            NO

  GUI: 
    QT:                          YES (ver 5.12.2)
      QT OpenGL support:         NO
    Win32 UI:                    YES
    VTK support:                 NO

  Media I/O: 
    ZLib:                        build (ver 1.2.11)
    JPEG:                        build-libjpeg-turbo (ver 2.0.2-62)
    WEBP:                        build (ver encoder: 0x020e)
    PNG:                         build (ver 1.6.37)
    TIFF:                        build (ver 42 - 4.0.10)
    JPEG 2000:                   build (ver 1.900.1)
    OpenEXR:                     build (ver 2.3.0)
    HDR:                         YES
    SUNRASTER:                   YES
    PXM:                         YES
    PFM:                         YES

  Video I/O:
    DC1394:                      NO
    FFMPEG:                      YES (prebuilt binaries)
      avcodec:                   YES (58.54.100)
      avformat:                  YES (58.29.100)
      avutil:                    YES (56.31.100)
      swscale:                   YES (5.5.100)
      avresample:                YES (4.0.0)
    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)

  OpenCL:                        YES (no extra features)
    Include path:                D:/Software/opencv2/opencv/sources/3rdparty/include/opencl/1.2
    Link libraries:              Dynamic load

  Python 3:
    Interpreter:                 C:/Users/Rwz/AppData/Local/Programs/Python/Python36/python.exe (ver 3.6.4)
    Libraries:                   C:/Users/Rwz/AppData/Local/Programs/Python/Python36/libs/libpython36.a (ver 3.6.4rc1)
    numpy:                       C:/Users/Rwz/AppData/Local/Programs/Python/Python36/lib/site-packages/numpy/core/include (ver 1.19.2)
    install path:                C:/Users/Rwz/AppData/Local/Programs/Python/Python36/Lib/site-packages/cv2/python-3.6

  Python (for build):            C:/Users/Rwz/AppData/Local/Programs/Python/Python36/python.exe

  Install to:                    D:/Software/opencv2/opencv/newbuild/install
-----------------------------------------------------------------

Configuring done

FFMPEG配置时容易下载失败。失败会生成一个CMakeDownloadLog.txt，在里面找到网址自己手动下载。然后放在CMakeDownloadLog.txt中说明的下载的位置。
image

  1. 点击generate,在newbuild目录下打开cmd，输入命令mingw32-make j4
  2. 编译完成，输出mingw32-make install
  3. 在newbuild目录下会生成一个install目录。将其拷贝到一个工作目录中，就可以在QT中引用opencv了。
    image

三、QT中使用Opencv

image

  1. 将上一步生成的install目录下bin目录添加进环境变量：（工作目录）installx64mingwin
  2. 将install目录下include问价和lib下的库加到QT的链接库中,在qt的pro文件中添加如下代码，需要自行修改install所在目录。
INCLUDEPATH+=D:/Rwz/opencv_420_use_dir/install/include
LIBS += -L D:/Rwz/opencv_420_use_dir/install/x64/mingw/lib/libopencv_*.a
  1. 使用opencv
#include "opencv2/opencv.hpp"
int main(int argc, char *argv[])
{
    cv::Mat m = cv::imread("R:/123.jpg");
    cv::imshow("title",m);
    cv::waitKey(0);
    return 0;
}

结果为：
image

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原文地址：https://www.cnblogs.com/Raowz/p/15257612.html