JavaCV example is not working - what am I missing?

Question

It's the first day of learning JavaCV for me. And this is the first test example which I use just to make sure that my setup is done correctly. Unfortunately I can't run the example and I barely understand the code and all dependencies so it's really hard for me to find out what is missing. Below I'll post my project setup and also the errors I get.

Also the example I use is from: http://ganeshtiwaridotcomdotnp.blogspot.com/2011/12/javacv-capture-save-flip-show-live.html

code

import static com.googlecode.javacv.cpp.opencv_core.cvFlip;
import static com.googlecode.javacv.cpp.opencv_highgui.cvSaveImage;
import com.googlecode.javacv.CanvasFrame;
import com.googlecode.javacv.FrameGrabber;
import com.googlecode.javacv.VideoInputFrameGrabber;
import com.googlecode.javacv.cpp.opencv_core.IplImage;

public class GrabberShow implements Runnable
{
    //final int INTERVAL=1000;///you may use interval IplImage image;
    CanvasFrame canvas = new CanvasFrame("Web Cam");
    public GrabberShow()
    {
        canvas.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
    }
    @Override
    public void run()
    {
        FrameGrabber grabber = new VideoInputFrameGrabber(0); // 1 for next camera
        int i = 0;
        try
        {
            grabber.start();
            IplImage img;
            while (true)
            {
                img = grabber.grab();
                if (img != null)
                {
                    cvFlip(img, img, 1);// l-r = 90_degrees_steps_anti_clockwise
                    cvSaveImage((i++) + "-aa.jpg", img); // show image on window
                    canvas.showImage(img);
                }
                //Thread.sleep(INTERVAL);
            }
        }
        catch (Exception e)
        {

        }
    }
}

I use Eclipse and it seems like all imports are there.

Here is a print screen of my project as it looks like in Eclipse:

So this is it for the setup. I try to get something out of this. When I right click on the project and try to Run it as Java Application the following windows is showing up:

You can see my choice at the top of the window. The I get an error window A Java Exception has occurred and here is part of the error I get in the console window:

Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\Users\Xman\AppData\Local\Temp\javacpp4929678155627\jniopencv_core.dll: Can't find dependent libraries
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.load0(Unknown Source)
at java.lang.System.load(Unknown Source)
at com.googlecode.javacpp.Loader.loadLibrary(Loader.java:422)
at com.googlecode.javacpp.Loader.load(Loader.java:372)`

I've read the error, it seems like the problem is caused by missing libraries but I'm not sure, also I have followed the instructions (which weren't that many in fact) and from the comments below the example code it seems that it actually works. So I guess the problem is somewhere here - in my project, code, setup, but I can't find what I'm missing or doing wrong.

Answer 1

This error occurs when your opencv dll are not set in System path. If you have extracted your opencv folder in C:\ directory then set your path as following

For 32 bit:

C:\opencv\build\x86\vc10\bin;C:\opencv\build\common\tbb\ia32\vc10\

For 64 bit:

C:\opencv\build\x64\vc10\bin;C:\opencv\build\common\tbb\intel64\vc10\

If you have extracted in different location then change the path accordingly.

In order to set path you can go to Control Panel > System Security > System > Advanced System Settings > Environment Variables. In System variable select path and click on Edit and insert above locations and restart windows.

you can find detailed instructions at http://opencvlover.blogspot.in/2012/04/javacv-setup-with-eclipse-on-windows-7.html