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Open Source Computer Vision Library
https://opencv.org/
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90 lines
3.0 KiB
90 lines
3.0 KiB
10 years ago
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Using OpenCV Java with Eclipse {#tutorial_java_eclipse}
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==============================
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Since version 2.4.4 [OpenCV supports Java](http://opencv.org/opencv-java-api.html). In this tutorial
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I will explain how to setup development environment for using OpenCV Java with Eclipse in
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**Windows**, so you can enjoy the benefits of garbage collected, very refactorable (rename variable,
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extract method and whatnot) modern language that enables you to write code with less effort and make
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less mistakes. Here we go.
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Configuring Eclipse
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-------------------
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First, obtain a fresh release of OpenCV [from download page](http://opencv.org/downloads.html) and
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extract it under a simple location like C:\\OpenCV-2.4.6\\. I am using version 2.4.6, but the steps
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are more or less the same for other versions.
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Now, we will define OpenCV as a user library in Eclipse, so we can reuse the configuration for any
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project. Launch Eclipse and select Window --\> Preferences from the menu.
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Navigate under Java --\> Build Path --\> User Libraries and click New....
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Enter a name, e.g. OpenCV-2.4.6, for your new library.
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Now select your new user library and click Add External JARs....
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Browse through C:\\OpenCV-2.4.6\\build\\java\\ and select opencv-246.jar. After adding the jar,
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extend the opencv-246.jar and select Native library location and press Edit....
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Select External Folder... and browse to select the folder C:\\OpenCV-2.4.6\\build\\java\\x64. If you
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have a 32-bit system you need to select the x86 folder instead of x64.
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Your user library configuration should look like this:
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Testing the configuration on a new Java project
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-----------------------------------------------
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Now start creating a new Java project.
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On the Java Settings step, under Libraries tab, select Add Library... and select OpenCV-2.4.6, then
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click Finish.
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Libraries should look like this:
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Now you have created and configured a new Java project it is time to test it. Create a new java
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file. Here is a starter code for your convenience:
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@code{.java}
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import org.opencv.core.Core;
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import org.opencv.core.CvType;
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import org.opencv.core.Mat;
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public class Hello
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{
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public static void main( String[] args )
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{
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System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
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Mat mat = Mat.eye( 3, 3, CvType.CV_8UC1 );
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System.out.println( "mat = " + mat.dump() );
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}
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}
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@endcode
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When you run the code you should see 3x3 identity matrix as output.
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That is it, whenever you start a new project just add the OpenCV user library that you have defined
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to your project and you are good to go. Enjoy your powerful, less painful development environment :)
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