'Install OpenCV on Mac Catalina

I am trying to install OpenCV on my Mac using this tutorial: https://medium.com/macoclock/setting-up-mac-for-opencv-java-development-with-intellij-idea-fd2153eb634f

When I do:

brew install opencv

I receive:

==> Searching for similarly named formulae... 
These similarly named formulae were found: 
opencv                     opencv@2               opencv@3 
To install one of them, run (for example):   
brew install opencv 
Error: No available formula or cask with the name "opencv".
==> Searching taps on GitHub... 
Error: No formulae found in taps.

It displays "opencv" formula, so why it does not install it? How to fix?

Also I have done:

> xcode-select --install
xcode-select: error: command line tools are already installed, use "Software Update" to install updates

and

> brew install ant
Warning: ant 1.10.9 is already installed and up-to-date
To reinstall 1.10.9, run `brew reinstall ant`

when try

brew install --build-from-source opencv

then receive the same error.

Also tried:

> brew uninstall opencv
Error: No available formula or cask with the name "opencv".
javaopencv


Solution 1:[1]

Apparently, there's more to do with installing OpenCV via homebrew than brew install opencv.

You need to make sure you have XCode Command Line Tools installed, as well as ANT. Then you need to run

brew install --build-from-source opencv

Take a look at the documentation for details and specifics.

Also it might be a homebrew issue - so update brew and run doctor.

Solution 2:[2]

I found easier way to get OpenCV through Maven.

Add to pom.xml:

<dependencies>
    <!-- https://mvnrepository.com/artifact/org.openpnp/opencv -->
    <dependency>
        <groupId>org.openpnp</groupId>
        <artifactId>opencv</artifactId>
        <version>4.3.0-3</version>
    </dependency>
</dependencies>

After adding the dependency, you need to load the library for use. Normally, you would use the line:

System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

however it will not work with this method. You need to change it to one of these lines:

nu.pattern.OpenCV.loadShared();
nu.pattern.OpenCV.loadLocally(); // Use in case loadShared() doesn't work

So the final result for test is:

import org.opencv.core.Core;

public class HelloCV {
    static {
        nu.pattern.OpenCV.loadShared();
        // nu.pattern.OpenCV.loadLocally(); // Use in case loadShared() doesn't work
    }

    public static void main(String[] args) {
        System.out.println(Core.VERSION);
        System.out.println(Core.VERSION_MAJOR);
        System.out.println(Core.VERSION_MINOR);
        System.out.println(Core.VERSION_REVISION);
        System.out.println(Core.NATIVE_LIBRARY_NAME);
        System.out.println(Core.getBuildInformation());
    }
}

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Kirill Ch
Solution 2 Kirill Ch

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