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Updated BuildOpenCV4OpenVINO (markdown)

Aleksandr Voron 2022-08-11 13:43:36 +02:00
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BuildOpenCV4OpenVINO.md

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# Contents
- [Introduction](#introduction)
- [Building on Ubuntu](#building-on-ubuntu)
- [Building on Windows](#building-on-windows)
- [Building on macOS](#building-on-macos)
- [Approach #1: Install prebuilt OpenCV](#approach-1-install-prebuilt-opencv)
- [Installing on Ubuntu](#installing-on-ubuntu)
- [Installing on RHEL](#installing-on-rhel)
- [Installing on Windows](#installing-on-windows)
- [Installing on macOS](#installing-on-macos)
- [Approach #2: Build OpenCV against specific version of OpenVINO](#approach-2-build-opencv-against-specific-version-of-openvino)
- [Building on Ubuntu](#building-on-ubuntu)
- [Building on Windows](#building-on-windows)
- [Building on macOS](#building-on-macos)
# Introduction
OpenVINO does not provide custom OpenCV drop since 2022.1.1 release.
If OpenVINO user needs OpenCV functionality there are 2 approaches how to get it:
1. Get OpenCV from another sources (system repositories, pip, conda, homebrew). It is easy to follow this approach, however it has several disadvantages:
1. Install prebuilt OpenCV from another sources (system repositories, pip, conda, homebrew). It is easy to follow this approach, however it has several disadvantages:
* OpenCV version is out-of-date
* OpenCV does not contain G-API module (e.g. some OMZ demos use G-API functionality)
* OpenCV does not use available CPU instructions since it has build to cover wide range of hardware
* OpenCV does not support Intel TBB, Intel Media SDK
* OpenCV DNN module can not use OpenVINO as computational backend
2. Compile OpenCV from source code. This approach solves the issues mentioned above.
2. Build OpenCV from source code against specific version of OpenVINO. This approach solves the issues mentioned above.
The instruction below shows how to build OpenCV for OpenVINO.
# Approach #1: Install prebuilt OpenCV
## Installing on Ubuntu
OpenCV is available from the default Ubuntu repositories:
> sudo apt update
sudo apt install libopencv-dev python3-opencv
## Installing on RHEL
OpenCV is available from the default RHEL repositories.
1. Enable CodeReady Linux Builder Repository:
> subscription-manager repos --enable codeready-builder-for-rhel-8-x86_64-rpms
2. Run:
> sudo yum update
sudo yum install opencv opencv-devel opencv-python
## Installing on Windows
1. Download OpenCV windows package on [the official OpenCV releases page](https://github.com/opencv/opencv/releases)
Windows archive contains VC postfix, e.g.: `opencv-4.6.0-vc14_vc15.exe`
2. Extract the archive
3. Run the script `opencv\build\setup_vars_opencv4.cmd`
## Installing on macOS
OpenCV could be installed via Homebrew:
> brew install opencv
# Approach #2: Build OpenCV against specific version of OpenVINO
## Building on Ubuntu