Library of programming functions mainly aimed at real-time vision

OpenCV

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Download OpenCV 4.9.0

OpenCV

  -  172 MB  -  Open Source
  • Latest Version

    OpenCV 4.9.0 LATEST

  • Review by

    Daniel Leblanc

  • 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

OpenCV (Open Source Computer Vision Library) is released under a BSD license and hence it’s free for both academic and commercial use. It has C++, Python, and Java interfaces and supports Windows, Linux, macOS, iOS, and Android. It was designed for computational efficiency and with a strong focus on real-time applications. Written in optimized C/C++, the library can take advantage of multi-core processing. Enabled with OpenCL, it can take advantage of the hardware acceleration of the underlying heterogeneous compute platform.

Adopted all around the world, OpenCV has more than 47 thousand people of the user community and an estimated number of downloads exceeding 14 million. Usage ranges from interactive art to mines inspection, stitching maps on the web, or through advanced robotics.

OpenCV (Open Source Computer Vision Library) is an open-source computer vision and machine learning software library. It was built to provide a common infrastructure for computer vision applications and to accelerate the use of machine perception in commercial products. Being a BSD-licensed product, It makes it easy for businesses to utilize and modify the code.

The library has more than 2500 optimized algorithms, which includes a comprehensive set of both classic and state-of-the-art computer vision and machine learning algorithms. These algorithms can be used to detect and recognize faces, identify objects, classify human actions in videos, track camera movements, track moving objects, extract 3D models of objects, produce 3D point clouds from stereo cameras, stitch images together to produce a high-resolution image of an entire scene, find similar images from an image database, remove red eyes from images taken using flash, follow eye movements, recognize scenery and establish markers to overlay it with augmented reality, etc.

It has more than 47 thousand people of the user community and an estimated number of downloads exceeding 14 million. The library is used extensively in companies, research groups, and governmental bodies.

Open CV has C++, Python, Java, and MATLAB interfaces and supports Windows, Linux, Android, and macOS. It leans mostly towards real-time vision applications and takes advantage of MMX and SSE instructions when available. A full-featured CUDA and OpenCL interfaces are being actively developed right now. There are over 500 algorithms and about 10 times as many functions that compose or support those algorithms. Open CV is written natively in C++ and has a templated interface that works seamlessly with STL containers.

Also Available: Download OpenCV for Mac

  • OpenCV 4.9.0 Screenshots

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

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

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