Library of programming functions mainly aimed at real-time vision

OpenCV

OpenCV 4.9.0

  -  172 MB  -  Open Source
  • Latest Version

    OpenCV 4.10.0

  • Operating System

    Windows XP / Vista / Windows 7 / Windows 8 / Windows 10

  • User Rating

    Click to vote
  • Author / Product

    OpenCV Team / External Link

  • Filename

    opencv-4.9.0-windows.exe

Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.

Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of OpenCV 4.9.0.


For those interested in downloading the most recent release of OpenCV or reading our review, simply click here.


All old versions distributed on our website are completely virus-free and available for download at no cost.


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  • OpenCV 4.9.0 Screenshots

    The images below have been resized. Click on them to view the screenshots in full size.

    OpenCV 4.9.0 Screenshot 1
  • OpenCV 4.9.0 Screenshot 2
  • OpenCV 4.9.0 Screenshot 3
  • OpenCV 4.9.0 Screenshot 4

What's new in this version:

Core Module:
- added cv::broadcast

DNN module patches:
- Experimental transformers support
- ONNX Attention layer support
- ONNX Einsum layer support
- OpenVINO backend for INT8 models
- ONNX Gather Elements layer
- ONNX InstanceNorm layer
- better support of ONNX Expand layer with cv::broadcast
- Improved DNN graph fusion with shared nodes and commutative operations
- New fastGEMM implementation and several layers on top of it
- Winograd fp16 optimizations on ARM
- Tests and multiple fixes for Yolo family models support
- New layers support and bug fixes in CUDA backend: GEMM, Gelu, Add
- CANN backend: bug fix, support HardSwish, LayerNormalization and InstanceNormalization
- LayerNormalization: support OpenVINO, OpenCL and CUDA backend