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Description
System Information
OpenCV version: 4.6.0
Operating System / Platform: Ubuntu 20.04
Python 3.8.10 (default, Jun 22 2022, 20:18:18)
Detailed description
cv2.readNet().forward() produces wrong results using manually built OpenCV compared to the wheel published on PyPi -opencv-contrib-python-headless.
The output of .forward() is off by few pixels (5-10), confidence is off, sometimes significantly.
ConcernsYOLOv5 (default model) converted to ONNX using their converting script.
When it produces correct results:
- CPU inference with
opencv-contrib-python-headlessfrom PyPi - CUDA inference with manually built
opencv-contrib-python-headless
When results are wrong:
- CPU inference with manually built
opencv-contrib-python-headless
So apparently my manual built is not using some BLAS/CPU library that official build is using? Still looks like a bug, given that inference does work and it does produce results that look sane (but in reality are off).
Steps to reproduce
- Cloneyolov5 repo
- Convert model to ONNX using
export.py - Run resulting yolov5s.onnx using cv2.dnn onsample image converted to png.
- Inference should be on CPU using provided build (below)
- Raw output from
net.forward()will be wrong, while it's right with opencv binaries from pypi.
Build details:
General configuration for OpenCV 4.6.0 ===================================== Version control: 4.6.0 Extra modules: Location (extra): /usr/src/opencv-python/opencv_contrib/modules Version control (extra): 4.6.0 Platform: Timestamp: 2022-12-02T17:57:18Z Host: Linux 5.15.0-1023-aws x86_64 CMake: 3.25.0 CMake generator: Ninja CMake build tool: /usr/bin/ninja 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 (15 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 (4 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX AVX2 (28 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX512_SKX (4 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX C/C++: Built as dynamic libs?: NO C++ standard: 11 C++ Compiler: /usr/bin/c++ (ver 9.4.0) C++ flags (Release): -fsigned-char -ffast-math -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-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 -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG C++ flags (Debug): -fsigned-char -ffast-math -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-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 -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG C Compiler: /usr/bin/cc C flags (Release): -fsigned-char -ffast-math -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-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 -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG C flags (Debug): -fsigned-char -ffast-math -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-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 -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG Linker flags (Release): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined Linker flags (Debug): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined ccache: NO Precompiled headers: NO Extra dependencies: /lib/openblas-base/libopenblas.so /usr/lib/x86_64-linux-gnu/libpng.so /usr/lib/x86_64-linux-gnu/libz.so Iconv::Iconv m pthread cudart_static dl rt nppc nppial nppicc nppidei nppif nppig nppim nppist nppisu nppitc npps cublas cudnn cufft -L/usr/local/cuda/lib64 -L/usr/lib/x86_64-linux-gnu 3rdparty dependencies: libprotobuf ade ittnotify libjpeg-turbo libwebp libtiff libopenjp2 IlmImf ippiw ippicv OpenCV modules: To be built: barcode bioinspired core cudaarithm cudabgsegm cudacodec cudafilters cudaimgproc cudalegacy cudawarping cudev dnn dnn_objdetect dnn_superres fuzzy gapi hfs img_hash imgcodecs imgproc intensity_transform line_descriptor ml phase_unwrapping photo plot python3 quality reg tracking video videoio wechat_qrcode xphoto Disabled: calib3d features2d flann highgui objdetect world Disabled by dependency: aruco bgsegm ccalib cudafeatures2d cudaobjdetect cudaoptflow cudastereo datasets dpm face mcc optflow rapid rgbd saliency shape stereo stitching structured_light superres surface_matching text videostab xfeatures2d ximgproc xobjdetect Unavailable: alphamat cvv freetype hdf java julia matlab ovis python2 sfm ts viz Applications: - Documentation: NO Non-free algorithms: NO GUI: VTK support: NO Media I/O: ZLib: /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11) JPEG: libjpeg-turbo (ver 2.1.2-62) WEBP: build (ver encoder: 0x020f) PNG: /usr/lib/x86_64-linux-gnu/libpng.so (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: NO avcodec: NO avformat: NO avutil: NO swscale: NO avresample: NO GStreamer: NO v4l/v4l2: YES (linux/videodev2.h) Parallel framework: pthreads Trace: YES (with Intel ITT) Other third-party libraries: Intel IPP: 2020.0.0 Gold [2020.0.0] at: /usr/src/opencv-python/_skbuild/linux-x86_64-3.8/cmake-build/3rdparty/ippicv/ippicv_lnx/icv Intel IPP IW: sources (2020.0.0) at: /usr/src/opencv-python/_skbuild/linux-x86_64-3.8/cmake-build/3rdparty/ippicv/ippicv_lnx/iw VA: NO Lapack: YES (/lib/openblas-base/libopenblas.so) Eigen: NO Custom HAL: NO Protobuf: build (3.19.1) NVIDIA CUDA: YES (ver 11.6, CUFFT CUBLAS FAST_MATH) NVIDIA GPU arch: 35 37 50 52 60 61 70 75 80 86 NVIDIA PTX archs: cuDNN: YES (ver 8.4.0) OpenCL: YES (no extra features) Include path: /usr/src/opencv-python/opencv/3rdparty/include/opencl/1.2 Link libraries: Dynamic load Python 3: Interpreter: /usr/bin/python3 (ver 3.8.10) Libraries: /usr/lib/x86_64-linux-gnu/libpython3.8.so (ver 3.8.10) numpy: /tmp/pip-build-env-i7jl326l/overlay/lib/python3.8/site-packages/numpy/core/include (ver 1.17.3) install path: python/cv2/python-3 Python (for build): /usr/bin/python3 Install to: /usr/src/opencv-python/_skbuild/linux-x86_64-3.8/cmake-install-----------------------------------------------------------------Issue submission checklist
- I report the issue, it's not a question
- I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
- I updated to the latest OpenCV version and the issue is still there
- There is reproducer code and related data files (videos, images, onnx, etc)