use brew to install OpenCV (support JAVA) for OSX

Current is 2022. The brew tool and pip tool could support OpenCV-4.6 very well.

Use brew tool:

1, install java if needed

brew install openjdk

If have error message ‘No Java Runtime present,requesting to install’, we need to complete the environment path. Use ‘temurin’ to casting from the env-path.

brew install temurin

2, install ant before install the OpenCV library

brew install ant

3, install OpenCV (version 4.6.0)

By default, install opencv by brew won’t support Java, need to update the install script before build.

brew edit opencv

Find a line:

-DBUILD_opencv_java=OFF

Change to:

-DBUILD_opencv_java=ON

Then install the OpenCV

brew install --build-from-source opencv

4, verify the library. The jar and dylib files will be located at /opt/homebrew/Cellar/opencv/4.6.0_1/share/java folder

brew info opencv

tabtu@ttAir ~ % brew info opencv
==> opencv: stable 4.6.0 (bottled)
Open source computer vision library
Home

/opt/homebrew/Cellar/opencv/4.6.0_1 (857 files, 123.1MB) *
  Built from source on 2022-11-28 at 16:36:04
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/opencv.rb
License: Apache-2.0
==> Dependencies
Build: cmake ✔, pkg-config ✔
Required: ceres-solver ✔, eigen ✔, ffmpeg ✔, glog ✔, harfbuzz ✔, jpeg-turbo ✔, libpng ✔, libtiff ✔, numpy ✔, openblas ✔, openexr ✔, openjpeg ✔, protobuf ✔, python@3.10 ✔, tbb ✔, vtk ✔, webp ✔
==> Analytics
install: 13,646 (30 days), 45,632 (90 days), 193,390 (365 days)
install-on-request: 13,194 (30 days), 44,222 (90 days), 186,369 (365 days)
build-error: 76 (30 days)