I’ve built OpenCV 4.9.0 from source a bunch of times…
Here’s my latest cmake:
:: Set paths
set "openCvSource=C:/OpenCV_4.9.0/opencv"
set "openCVExtraModules=C:/OpenCV_4.9.0/opencv_contrib/modules"
set "openCvBuild=C:/OpenCV_4.9.0/build"
set "buildType=Release"
set "generator=Ninja"
set "pathToPython37Dir=C:/Python/Python37"
:: Configure
"C:/Program Files/CMake/bin/cmake.exe" ^
-H"%openCvSource%" ^
-DOPENCV_EXTRA_MODULES_PATH="%openCVExtraModules%" ^
-B"%openCvBuild%" ^
-G%generator% ^
-DCMAKE_BUILD_TYPE=%buildType% ^
-DBUILD_EXAMPLES=OFF ^
-DBUILD_opencv_world=OFF ^
-DWITH_CUDA=ON ^
-DBUILD_opencv_python3=ON ^
-DPYTHON3_INCLUDE_DIR=%pathToPython37Dir%/include ^
-DPYTHON3_LIBRARY=%pathToPython37Dir%/libs/python37.lib ^
-DPYTHON3_EXECUTABLE=%pathToPython37Dir%/python.exe ^
-DPYTHON3_NUMPY_INCLUDE_DIRS=%pathToPython37Dir%/lib/site-packages/numpy/core/include ^
-DPYTHON3_PACKAGES_PATH=%pathToPython37Dir%/Lib/site-packages/ ^
-DBUILD_TESTS=OFF ^
-DBUILD_PERF_TESTS=OFF ^
-DBUILD_opencv_apps=OFF ^
-DWITH_OPENGL=ON ^
-DOPENCV_DNN_CUDA=ON ^
-DOPENCV_ENABLE_NONFREE=ON ^
-DBUILD_opencv_python2=OFF ^
-DCUDA_ARCH_BIN=9.0 ^
-DCUDA_ARCH_PTX= ^
which results in:
-- General configuration for OpenCV 4.9.0 =====================================
-- Version control: 4.9.0
--
-- Extra modules:
-- Location (extra): C:/OpenCV_4.9.0/opencv_contrib/modules
-- Version control (extra): 4.9.0
--
-- Platform:
-- Timestamp: 2024-12-12T20:43:36Z
-- Host: Windows 10.0.19045 AMD64
-- CMake: 3.28.1
-- CMake generator: Ninja
-- CMake build tool: C:/PROGRA~1/MIB055~1/2022/PROFES~1/Common7/IDE/COMMON~1/MICROS~1/CMake/Ninja/ninja.exe
-- MSVC: 1938
-- Configuration: 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 (16 files): + SSSE3 SSE4_1
-- SSE4_2 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2
-- FP16 (0 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
-- AVX (8 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
-- AVX2 (36 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
-- AVX512_SKX (5 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: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/MSVC/14.38.33130/bin/Hostx64/x64/cl.exe (ver 19.38.33133.0)
-- 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 /FS /EHa /wd4127 /wd4251 /wd4324 /wd4275 /wd4512 /wd4589 /wd4819 /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 /FS /EHa /wd4127 /wd4251 /wd4324 /wd4275 /wd4512 /wd4589 /wd4819 /Zi /Ob0 /Od /RTC1
-- C Compiler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/MSVC/14.38.33130/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 /FS /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 /FS /Zi /Ob0 /Od /RTC1
-- Linker flags (Release): /machine:x64 /INCREMENTAL:NO
-- Linker flags (Debug): /machine:x64 /debug /INCREMENTAL
-- ccache: NO
-- Precompiled headers: NO
-- Extra dependencies: 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:"C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v12.3/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 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 video videoio videostab wechat_qrcode xfeatures2d ximgproc xobjdetect xphoto
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: alphamat cannops cvv freetype hdf java julia matlab ovis python2 sfm ts viz
-- Applications: -
-- Documentation: NO
-- Non-free algorithms: YES
--
-- Windows RT support: NO
--
-- GUI: WIN32UI
-- Win32 UI: YES
-- OpenGL support: YES (opengl32 glu32)
-- VTK support: NO
--
-- Media I/O:
-- ZLib: build (ver 1.3)
-- JPEG: build-libjpeg-turbo (ver 2.1.3-62)
-- SIMD Support Request: YES
-- SIMD Support: NO
-- WEBP: build (ver encoder: 0x020f)
-- PNG: build (ver 1.6.37)
-- TIFF: build (ver 42 - 4.2.0)
-- JPEG 2000: build (ver 2.5.0)
-- 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 (58.134.100)
-- avformat: YES (58.76.100)
-- avutil: YES (56.70.100)
-- swscale: YES (5.9.100)
-- avresample: YES (4.0.0)
-- GStreamer: YES (1.22.8)
-- DirectShow: YES
-- Media Foundation: YES
-- DXVA: YES
--
-- Parallel framework: Concurrency
--
-- Trace: YES (with Intel ITT)
--
-- Other third-party libraries:
-- Intel IPP: 2021.11.0 [2021.11.0]
-- at: C:/OpenCV_4.9.0/build/3rdparty/ippicv/ippicv_win/icv
-- Intel IPP IW: sources (2021.11.0)
-- at: C:/OpenCV_4.9.0/build/3rdparty/ippicv/ippicv_win/iw
-- Lapack: NO
-- Eigen: NO
-- Custom HAL: NO
-- Protobuf: build (3.19.1)
-- Flatbuffers: builtin/3rdparty (23.5.9)
--
-- NVIDIA CUDA: YES (ver 12.3, CUFFT CUBLAS NVCUVID NVCUVENC)
-- NVIDIA GPU arch: 90
-- NVIDIA PTX archs:
--
-- cuDNN: YES (ver 8.9.7)
--
-- OpenCL: YES (NVD3D11)
-- Include path: C:/OpenCV_4.9.0/opencv/3rdparty/include/opencl/1.2
-- Link libraries: Dynamic load
--
-- Python 3:
-- Interpreter: C:/Python/Python37/python.exe (ver 3.7)
-- Libraries: C:/Python/Python37/libs/python37.lib (ver 3.7.0)
-- numpy: C:/Python/Python37/Lib/site-packages/numpy/core/include (ver 1.21.6)
-- install path: C:/Python/Python37/Lib/site-packages//cv2/python-3.7
--
-- Python (for build): C:/Python/Python37/python.exe
--
-- Java:
-- ant: NO
-- Java: NO
-- JNI: NO
-- Java wrappers: NO
-- Java tests: NO
--
-- Install to: C:/OpenCV_4.9.0/build/install
-- -----------------------------------------------------------------
--
-- Configuring done (38.0s)
-- Generating done (2.4s)
-- Build files have been written to: C:/OpenCV_4.9.0/build
The cv2.pyd file is in C:/Python/Python37/Lib/site-packages//cv2/python-3.7 when the build completes. In C:/Python/Python37/Lib/site-packages//cv2 there’s a bunch of folders with OpenCV module names, and __init__.pyi files. Presumably these are Python stubs used for type hints, etc…
My Python project is a simple test project, so far with only:
import cv2
in main.py.
For the life of me I can’t even get past this import statement without some form of, No module name 'cv2', Cannot load DLL, etc… errors.
- I have copied the full contents of
C:/Python/Python37/Lib/site-packages//cv2into<Python Project Root Folder>/venv/site-packages/cv2. - I have tried putting
cv2.pydin every folder:<Python Project Root Folder>/venv/site-packages,<Python Project Root Folder>/venv/site-packages/cv2,<Python Project Root Folder>/venv/site-packages/cv2/python-3.7. Everywhere I put it, it can’t be found. - I’ve placed the DLLs from the build folder into all of the same above folders with no luck.
Have been at this for a few days with no successes other than being able to (seemingly) build OpenCV.
I do get type hints in PyCharm when I start typing cv2. - I’ll get a list of modules, functions, etc… I think this is because of all the sub-folders in <Python Project Root Folder>/venv/site-packages/cv2 with those pyi files.
A colleague of mine has done this same process months ago and has it working on his machine with cv2.pyd and all DLL files placed in the <Python Project Root Folder>/venv/site-packages folder.
I’m not even sure what to try next – I must be missing something.
Can anyone out there offer some ideas / pointers?
Thanks in advance,
R