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windows+vscode+opencv源码安装配置_cleaning internal cached variable: webp_library

作者：AllinToyou | 2024-02-20 12:35:17

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cleaning internal cached variable: webp_library

一、参考资料

VScode搭建OpenCV环境
 OpenCV使用CMake和MinGW-w64的编译安装
 win10下VSCode配置opencv4.4.0（超详细教程，亲测有效）
VSCODE中配置C++的OPENCV库
 Windows10下Opencv4+CMake+MinGW64+VSC安装教程
 CMake和minGW-64 编译安装 OpenCV3.4.11以供 Qt 使用
 visual studio 2019 安装 opencv 详细图文流程
 win10下使用Cmake的MinGW编译配置Opencv

二、步骤

1. vscode安装并配置

2. MinGW安装并配置

参考博客【Windows版】配置C/C++开发环境

3. 官网下载OpenCV源码并安装

OpenCV官网

解压OpenCV源码
opencv-4.5.2-vc14_vc15.exe

##begin---------------------2021-06-22补充----------------------------##

OpenCV首页找不到链接，解决办法如下图：

##end---------------------2021-06-22补充----------------------------##

4. CMake安装并配置（配置编译选项）
安装CMake，参考博客【Windows版】CMake安装教程

（1）打开 cmake-gui，设置源码路径和编译生成路径：
cmake-gui.exe的路径：D:\360Downloads\CMake\cmake-3.20.3-windows-x86_64\bin\cmake-gui.exe
Where is the source code:
D:/360Downloads/Software/opencv/sources

Where to build the binaries:
D:/360Downloads/Software/opencv/build/x64/MinGw

MinGw是新建的文件夹，用来存放编译好的OpenCV

（2）点击 Configure，设置编译器

配置好opencv的源码路径和编译生成路径，点击Configure即可触发配置，第一次配置需要输入编译器类型以及Makefile类型：

Compilers C: D:\360Downloads\MinGW\mingw64\bin\gcc.exe
Compilers C++: D:\360Downloads\MinGW\mingw64\bin\g++.exe

勾选 WITH_OPENGL
勾选 ENABLE_CXX11
不勾选 WITH_IPP
不勾选 ENABLE_PRECOMPILED_HEADERS

第一次Configure，生成红色的，勾选对应的属性之后，再重新Configure。

CMake的 Configure要多点几次, 一直点到上面的配置项没有红色为止。

（3）勾选配置


勾选：
BUILD_opencv_world
WITH_OPENGL
BUILD_EXAMPLES
设置OPENCV_DOWNLOAD_PATH
 
不勾选：
WITH_IPP
WITH_MSMF
ENABLE_PRECOMPILED_HEADERS
CPU_DISPATCH

如果要编译 opencv_contrib，则需要在 OPENCV_EXTRA_MODULES_PATH 把路径选择为解压的 opencv_contrib 文件中的“modules”文件夹。再次点击Configure。

======================完整的参数配置=========================

---------------2021-06-04补充---------------


General configuration for OpenCV 4.5.2 =====================================
  Version control:               unknown
 
  Extra modules:
    Location (extra):            D:/360Downloads/opencv/opencv_contrib-4.5.2/modules
    Version control (extra):     unknown
 
  Platform:
    Timestamp:                   2021-06-04T01:58:13Z
    Host:                        Windows 10.0.17763 AMD64
    CMake:                       3.20.3
    CMake generator:             Visual Studio 16 2019
    CMake build tool:            D:/360Downloads/VisualStudio2019/2019/Professional/MSBuild/Current/Bin/MSBuild.exe
    MSVC:                        1929
    Configuration:               Debug Release
 
  CPU/HW features:
    Baseline:                    SSE SSE2 SSE3
      requested:                 SSE3
    Dispatched code generation:  SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
      requested:                 SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
      SSE4_1 (17 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 (31 files):           + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
      AVX512_SKX (7 files):      + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX
 
  C/C++:
    Built as dynamic libs?:      YES
    C++ standard:                11
    C++ Compiler:                D:/360Downloads/VisualStudio2019/2019/Professional/VC/Tools/MSVC/14.29.30037/bin/Hostx64/x64/cl.exe  (ver 19.29.30037.0)
    C++ flags (Release):         /DWIN32 /D_WINDOWS /W4 /GR  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise     /EHa /wd4127 /wd4251 /wd4324 /wd4275 /wd4512 /wd4589 /MP  /MD /O2 /Ob2 /DNDEBUG 
    C++ flags (Debug):           /DWIN32 /D_WINDOWS /W4 /GR  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise     /EHa /wd4127 /wd4251 /wd4324 /wd4275 /wd4512 /wd4589 /MP  /MDd /Zi /Ob0 /Od /RTC1 
    C Compiler:                  D:/360Downloads/VisualStudio2019/2019/Professional/VC/Tools/MSVC/14.29.30037/bin/Hostx64/x64/cl.exe
    C flags (Release):           /DWIN32 /D_WINDOWS /W3  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise     /MP   /MD /O2 /Ob2 /DNDEBUG 
    C flags (Debug):             /DWIN32 /D_WINDOWS /W3  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise     /MP /MDd /Zi /Ob0 /Od /RTC1 
    Linker flags (Release):      /machine:x64  /INCREMENTAL:NO 
    Linker flags (Debug):        /machine:x64  /debug /INCREMENTAL 
    ccache:                      NO
    Precompiled headers:         YES
    Extra dependencies:          opengl32 glu32 cudart_static.lib nppc.lib nppial.lib nppicc.lib nppidei.lib nppif.lib nppig.lib nppim.lib nppist.lib nppisu.lib nppitc.lib npps.lib cublas.lib cudnn.lib cufft.lib -LIBPATH:D:/360Downloads/CUDA11.3/NVIDIA GPU Computing Toolkit/CUDA/v11.3/lib/x64
    3rdparty dependencies:
 
  OpenCV modules:
    To be built:                 aruco bgsegm bioinspired calib3d ccalib core cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev datasets dnn dnn_objdetect dnn_superres dpm face features2d flann fuzzy gapi hdf 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 wechat_qrcode xfeatures2d ximgproc xobjdetect xphoto
    Disabled:                    world
    Disabled by dependency:      -
    Unavailable:                 alphamat cnn_3dobj cvv freetype java julia matlab ovis python2 sfm viz
    Applications:                tests perf_tests examples apps
    Documentation:               NO
    Non-free algorithms:         YES
 
  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-libjpeg-turbo (ver 2.0.6-62)
    WEBP:                        build (ver encoder: 0x020f)
    PNG:                         build (ver 1.6.37)
    TIFF:                        build (ver 42 - 4.2.0)
    JPEG 2000:                   build (ver 2.4.0)
    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 (58.91.100)
      avformat:                  YES (58.45.100)
      avutil:                    YES (56.51.100)
      swscale:                   YES (5.7.100)
      avresample:                YES (4.0.0)
    GStreamer:                   NO
    DirectShow:                  YES
 
  Parallel framework:            Concurrency
 
  Trace:                         YES (with Intel ITT)
 
  Other third-party libraries:
    Lapack:                      NO
    Eigen:                       NO
    Custom HAL:                  NO
    Protobuf:                    build (3.5.1)
 
  NVIDIA CUDA:                   YES (ver 11.3, CUFFT CUBLAS)
    NVIDIA GPU arch:             35 37 50 52 60 61 70 75 80 86
    NVIDIA PTX archs:
 
  cuDNN:                         YES (ver 8.2.0)
 
  OpenCL:                        YES (NVD3D11)
    Include path:                D:/360Downloads/opencv/sources/3rdparty/include/opencl/1.2
    Link libraries:              Dynamic load
 
  ONNX:                          NO
 
  Python 3:
    Interpreter:                 D:/360Downloads/Anaconda3/python.exe (ver 3.8.8)
    Libraries:                   D:/360Downloads/Anaconda3/libs/python38.lib (ver 3.8.8)
    numpy:                       D:/360Downloads/Anaconda3/lib/site-packages/numpy/core/include (ver 1.20.1)
    install path:                D:/360Downloads/Anaconda3/Lib/site-packages/cv2/python-3.8
 
  Python (for build):            D:/360Downloads/Anaconda3/python.exe
 
  Java:                          
    ant:                         NO
    JNI:                         NO
    Java wrappers:               NO
    Java tests:                  NO
 
  Install to:                    D:/360Downloads/opencv/build/x64/MinGw/install
-----------------------------------------------------------------
 
Configuring done

（4）生成的配置信息，并生成MakeFiles文件


Detected processor: AMD64
Could NOT find PythonInterp: Found unsuitable version "2.7.16", but required is at least "3.2" (found D:/Anaconda2/python.exe)
Looking for ccache - not found
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
Cleaning INTERNAL cached variable: ZLIB_LIBRARY
Cleaning INTERNAL cached variable: ZLIB_INCLUDE_DIR
Found ZLIB: D:/Anaconda2/Library/lib/z.lib (found suitable version "1.2.11", minimum required is "1.2.3") 
libjpeg-turbo: VERSION = 2.0.6, BUILD = opencv-4.5.2-libjpeg-turbo
Cleaning INTERNAL cached variable: TIFF_LIBRARY
Cleaning INTERNAL cached variable: TIFF_INCLUDE_DIR
Found TIFF: D:/Anaconda2/Library/lib/tiff.lib (found version "4.0.10")  
Cleaning INTERNAL cached variable: WEBP_LIBRARY
Cleaning INTERNAL cached variable: WEBP_INCLUDE_DIR
Could NOT find OpenJPEG (minimal suitable version: 2.0, recommended version >= 2.3.1). OpenJPEG will be built from sources
OpenJPEG: VERSION = 2.4.0, BUILD = opencv-4.5.2-openjp2-2.4.0
OpenJPEG libraries will be built from sources: libopenjp2 (version "2.4.0")
Cleaning INTERNAL cached variable: PNG_LIBRARY
Cleaning INTERNAL cached variable: PNG_INCLUDE_DIR
Found ZLIB: D:/Anaconda2/Library/lib/z.lib (found version "1.2.11") 
Found PNG: D:/Anaconda2/Library/lib/libpng.lib (found version "1.6.37") 
Looking for D:/Anaconda2/Library/include/libpng/png.h
Looking for D:/Anaconda2/Library/include/libpng/png.h - not found
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) 
Could NOT find LAPACK (missing: LAPACK_LIBRARIES) 
    Reason given by package: LAPACK could not be found because dependency BLAS could not be found.
 
Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) 
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:/360Downloads/Software/opencv/build/x64/MinGw/python_loader
Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) 
Consider adding OPENCV_ALLOCATOR_STATS_COUNTER_TYPE=int/int64_t according to your build configuration
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
Registering hook 'INIT_MODULE_SOURCES_opencv_dnn': D:/360Downloads/Software/opencv/sources/modules/dnn/cmake/hooks/INIT_MODULE_SOURCES_opencv_dnn.cmake
opencv_dnn: filter out ocl4dnn source code
opencv_dnn: filter out cuda4dnn source code
Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx512_skx.cpp
Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) 
OpenCL samples are skipped: OpenCL SDK is required
SYCL/OpenCL samples are skipped: SYCL SDK is required
   - check configuration of SYCL_DIR/SYCL_ROOT/CMAKE_MODULE_PATH
   - ensure that right compiler is selected from SYCL SDK (e.g, clang++): CMAKE_CXX_COMPILER=D:/360Downloads/Software/MinGW/mingw64/bin/g++.exe
CMake Warning at cmake/OpenCVGenSetupVars.cmake:54 (message):
  CONFIGURATION IS NOT SUPPORTED: validate setupvars script in install
  directory
Call Stack (most recent call first):
  CMakeLists.txt:1010 (include)
 
 
 
General configuration for OpenCV 4.5.2 =====================================
  Version control:               unknown
 
  Platform:
    Timestamp:                   2021-04-09T02:59:22Z
    Host:                        Windows 10.0.18363 AMD64
    CMake:                       3.20.1
    CMake generator:             MinGW Makefiles
    CMake build tool:            D:/360Downloads/Software/MinGW/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 (17 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 (31 files):           + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
 
  C/C++:
    Built as dynamic libs?:      YES
    C++ standard:                11
    C++ Compiler:                D:/360Downloads/Software/MinGW/mingw64/bin/g++.exe  (ver 8.1.0)
    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 -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 -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:/360Downloads/Software/MinGW/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 -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 -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 stitching ts video videoio
    Disabled:                    python2 world
    Disabled by dependency:      -
    Unavailable:                 java python3
    Applications:                tests perf_tests examples apps
    Documentation:               NO
    Non-free algorithms:         NO
 
  Windows RT support:            NO
 
  GUI: 
    Win32 UI:                    YES
    VTK support:                 NO
 
  Media I/O: 
    ZLib:                        D:/Anaconda2/Library/lib/z.lib (ver 1.2.11)
    JPEG:                        build-libjpeg-turbo (ver 2.0.6-62)
    WEBP:                        build (ver encoder: 0x020f)
    PNG:                         D:/Anaconda2/Library/lib/libpng.lib (ver 1.6.37)
    TIFF:                        D:/Anaconda2/Library/lib/tiff.lib (ver 42 / 4.0.10)
    JPEG 2000:                   build (ver 2.4.0)
    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 (58.91.100)
      avformat:                  YES (58.45.100)
      avutil:                    YES (56.51.100)
      swscale:                   YES (5.7.100)
      avresample:                YES (4.0.0)
    GStreamer:                   NO
    DirectShow:                  YES
 
  Parallel framework:            none
 
  Trace:                         YES (with Intel ITT)
 
  Other third-party libraries:
    Lapack:                      NO
    Eigen:                       NO
    Custom HAL:                  NO
    Protobuf:                    build (3.5.1)
 
  OpenCL:                        YES (no extra features)
    Include path:                D:/360Downloads/Software/opencv/sources/3rdparty/include/opencl/1.2
    Link libraries:              Dynamic load
 
  Python (for build):            D:/Anaconda2/python.exe
 
  Java:                          
    ant:                         NO
    JNI:                         NO
    Java wrappers:               NO
    Java tests:                  NO
 
  Install to:                    D:/360Downloads/Software/opencv/build/x64/MinGw/install
-----------------------------------------------------------------
 
Configuring done
Generating done

5. 编译OpenCV
进入MakeFiles所在文件夹

>>> cd  D:\360Downloads\opencv\build\x64\MinGw

使用多线程编译，编译时间5-10分钟，根据电脑性能有差异

>>> minGW32-make -j 8

6. 安装OpenCV

minGW32-make install

D:/360Downloads/Software/opencv/build/x64/MinGw/install/x64/mingw/bin 目录下有两个dll文件：

libopencv_world452.dll
opencv_videoio_ffmpeg452_64.dll

7. 测试OpenCV是否安装成功

findContours_demo.cpp


/**
 * @function findContours_Demo.cpp
 * @brief Demo code to find contours in an image
 * @author OpenCV team
 */
 
#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
#include <iostream>
 
using namespace cv;
using namespace std;
 
Mat src_gray;
int thresh = 100;
RNG rng(12345);
 
/// Function header
void thresh_callback(int, void* );
 
/**
 * @function main
 */
int main( int argc, char** argv )
{
    /// Load source image
    CommandLineParser parser( argc, argv, "{@input | HappyFish.jpg | input image}" );
    Mat src = imread( samples::findFile( parser.get<String>( "@input" ) ) );
    if( src.empty() )
    {
      cout << "Could not open or find the image!\n" << endl;
      cout << "Usage: " << argv[0] << " <Input image>" << endl;
      return -1;
    }
 
    /// Convert image to gray and blur it
    cvtColor( src, src_gray, COLOR_BGR2GRAY );
    blur( src_gray, src_gray, Size(3,3) );
 
    /// Create Window
    const char* source_window = "Source";
    namedWindow( source_window );
    imshow( source_window, src );
 
    const int max_thresh = 255;
    createTrackbar( "Canny thresh:", source_window, &thresh, max_thresh, thresh_callback );
    thresh_callback( 0, 0 );
 
    waitKey();
    return 0;
}
 
/**
 * @function thresh_callback
 */
void thresh_callback(int, void* )
{
    /// Detect edges using Canny
    Mat canny_output;
    Canny( src_gray, canny_output, thresh, thresh*2 );
 
    /// Find contours
    vector<vector<Point> > contours;
    vector<Vec4i> hierarchy;
    findContours( canny_output, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE );
 
    /// Draw contours
    Mat drawing = Mat::zeros( canny_output.size(), CV_8UC3 );
    for( size_t i = 0; i< contours.size(); i++ )
    {
        Scalar color = Scalar( rng.uniform(0, 256), rng.uniform(0,256), rng.uniform(0,256) );
        drawContours( drawing, contours, (int)i, color, 2, LINE_8, hierarchy, 0 );
    }
 
    /// Show in a window
    imshow( "Contours", drawing );
}

三、注意事项

（1）在操作cmake-gui前，如果没有翻过墙的话，在C:\Windows\System32\drivers\etc\hosts文件最后追加：

151.101.72.133 raw.githubusercontent.com

因为cmake-gui会下载一些文件，这些文件都在raw.githubusercontent.com上，如果不修改一下hosts，许多文件很可能会下载失败

四、可能存在的问题

（1）编译OpenCV出现错误

如果报错可查阅下面的网址帮助：

https://blog.huihut.com/2018/07/31/CompiledOpenCVWithMinGW64/

一般问题都是可以通过勾选和 去勾选 解决的，重新Configure，重新编译即可。

错误原因：
在配置MinGw信息的时候，勾选信息错误

解决办法：

参考上文步骤4，第（3）勾选配置

（2）找不到libopencv_core452

错误原因：

没有把编译好的OpenCV添加到环境变量中

解决办法：

添加环境变量
D:\360Downloads\Software\opencv\build\x64\MinGw\bin

（3）无法找到入口
无法定位程序输入点_ZNSt6thread15_M_start_threadESt10unique_ptrINS_6_StateESt14default_deleteIS1_EEPFvvE

huihut/OpenCV-MinGW-Build
https://github.com/huihut/OpenCV-MinGW-Build/issues/18

错误原因：
anaconda 中的 LIBSTDC++-6.DLL 与 MinGW64 的LIBSTDC++-6.DLL 冲突所导致的，在配置环境变量时将 MinGW64 的 bin 路径移到高于 anaconda 的 mingw-w64/bin 路径更高优先级的位置就可以了

解决办法：

（4）CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
FFMPEG: Download failed: 6;"Couldn't resolve host name"
错误原因：下载ffmpeg失败，需要翻墙
解决办法：见上文【三、注意事项】

（5）如果opencv编译失败，删除目录 D:\360Downloads\Software\opencv\build\x64\MinGw 里的所有文件，重头开始

（6）gcc: error: long: No such file or directory

参考资料：
使用CMake+Qt自带的MinGW编译OpenCV
gcc: error: long: No such file or directory

错误原因：在CMake的configure配置文件勾选中，勾选错误
解决办法：

在CMake中找到OPENCV_ENABLE_ALLOCATOR_STATS这项，取消勾选
重新Configure，重新Generate
重新mingw32-make编译

（7）ImportError: DLL load failed while importing cv2

参考资料：

opencv cuda加速编译后调用python接口后报错ImportError: DLL load failed while importing cv2记录

错误原因：在CMake源码安装了C++版本的Opencv，但没有安装python版本的Opencv
解决办法：


>>> cd PATH\TO\python_loader
>>> python setup.py install  # 安装python版本的Opencv

（8）recursion is detected during loading of cv2 binary extensions

（9）在vs2015中配置Opencv，无法找到源文件"opencv2/opencv.hpp"

参考资料：在vs2015中配置Opencv，无法找到源文件"opencv2/opencv.hpp"
解决办法：VS2019中x86改为x64

五、其他

（1）opencv 和opencv_contrib配置
参考博客【Windows版】opencv 和opencv_contrib配置

（2）修改python版本

在cmake-gui中修改

（3）ubuntu编译OpenCV

从源码安装ＯpenCV，使用python

（4）用Visual studio编译OpenCV

Windows下 Cmake + VS 编译 OpenCV (+ opencv_contribute)源码

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