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I am facing a problem in loading OpenCV in Java(Eclipse, Mac OSX). I am new to Java and my main target is Image Processing.I have checked several examples online but....I have few queries actually:

0) Can you actually instruct me how to use OpenCV library for Java in Eclipse in Mac OS X? I have only downloaded the jar and done the import....

1) Below is a sample of my code

Mat A = Highgui.imread("/Users/.../Dropbox/ImageJSpace/Image_0001.jpg", 1);
    Mat B = null;
    Imgproc.cvtColor(A, B, Imgproc.COLOR_BGR2GRAY);

    Highgui.imwrite("/Users/.../Dropbox/ImageJSpace/Image_0001gray.jpg", B);

In this section, I am simply trying to read image, covert to matrix, to graysale and then save to image again. In the examples that I checked online, they have mentioned cvtColor but overtime i try to write it doesn't work. I have to write Highgui.cvtColor and for each keyword from this new library.

2) I get the following error:

Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1764)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
at java.lang.System.loadLibrary(System.java:1044)
at org.opencv.highgui.Highgui.<clinit>(Highgui.java:416)
at Expertising.ImageModifications.Mat2Img(ImageModifications.java:382)
at Expertising.Main.main(Main.java:7)

I don't know how to get rid of this..

3) To be clear for my program, which is longer than this section, I have used the following imports:

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.Size;
import org.opencv.highgui.Highgui;
import org.opencv.imgproc.Imgproc;

4) I want to process DICOM images using OpenCV. Is there a method to work with that?

5) I also have imported the ImageJ library to work with DICOM. I can open and display. Can I read and work with pixels?

6) I am mainly interested in studying structure tensor in DICOM images. How can I read individual pixels from DICOM?

7) I am working in studying directionality. Is there any method to better explore it?

8) Can I convert my DICOM Image to Matrix and then explore the pixels as Matrix by use of JAMA?

Please help,, thanks a lot....

Psi Lambda Delta
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3 Answers3

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I don't know anything about OpenCV but here is a tutorial on how to use OpenCV with Eclipse.

As for DICOM I found this:

OpenCV does not support DICOM images so that you will have to find a suitable libary (like http://dicom.offis.de/dcmtk.php.en ) and convert the loaded image to a cv::Mat.

I would suggest using the OpenCV Questions site for this question.

FrankyG
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Did you add OpenCV Core library to main method?

System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
Tolga DURAN
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To load a video file using OpenCV in Java, make sure you have OpenCV properly installed and configured in your Java project. You can refer to the OpenCV documentation for getting an idea. Like another user pointed out, the OpenCV section of stackoverflow should be a great place to find help!

Sujata R
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