JavaCV/OpenCV: cvLoadImage not working

Question

I installed the JavaCV/OpenCV libraries, and I'm having a problem with the basic example code.

According to several examples that I have looked at, this code should load an image:

IplImage image = cvLoadImage("C:\\img.jpg");

But, when I run that I get a "cannot find symbol" error.

Since this is my first time using it, I'm not sure if I messed the install up or not.

According to the newest JavaCV readme, I do have the correct version of OpenCV. I also have all the JavaCV jar files imported. As far as I can tell, I also have all the paths set correctly too.

Anyone know what the problem is?

Edit:

Full code:

import com.googlecode.javacv.CanvasFrame;
import com.googlecode.javacv.cpp.opencv_core.IplImage;
import java.io.File;


public class demo {

    public static void main(String[] args) 
    {
        IplImage image = cvLoadImage("C:\\img.jpg");

        final CanvasFrame canvas = new CanvasFrame("Demo");
        canvas.showImage(image);
        canvas.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
    }

}

Error when I try to run it:

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: cvLoadImage at javacv.demo.main(demo.java:17)

Java Result: 1

Seems like it is claiming cvLoadImage doesn't take a string as an argument.

Edited and added the full program plus the error message. That is the only error it throws. — Lucas, Apr 07 '13 at 21:19
Did you try this: http://stackoverflow.com/questions/2333285/java-lang-runtimeexception-uncompilable-source-code-what-can-cause-this and this: http://stackoverflow.com/questions/4386076/uncompilable-source-code-runtimeexception-in-netbeans ? — cyriel, Apr 07 '13 at 21:33
Just tried it. It didn't change anything. I'm getting the same error. — Lucas, Apr 07 '13 at 21:48
Please can you submit the class incl. package name and all imports? did you have another classes/packages in your project? — Festus Tamakloe, Apr 07 '13 at 22:04
Here is the class file: https://gist.github.com/xRedactedx/5332779 It is the only class in the project. — Lucas, Apr 07 '13 at 22:13

Festus Tamakloe · Accepted Answer · 2013-04-07T22:31:42.837

5

A walk around that i find for you is to load the image by ImageIO and passe it later to IplImage

e.g.:

 BufferedImage img =  ImageIO.read(new File("C:\\img.jpg") );
 IplImage origImg = IplImage.createFrom(img);

edited Apr 07 '13 at 22:31

answered Apr 07 '13 at 22:23

Festus Tamakloe

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ImageIO.read("C:\\img.jpg") says: no suitable method found for read(String) I think maybe I messed up the install somewhere. – Lucas Apr 07 '13 at 22:29
Yes, that works. Thanks for the help. Any idea why the other won't work? CanvasFrame is loading from cv library, so it must be working. – Lucas Apr 07 '13 at 22:35
Not exactly. Any there is sometimes problems between the Filenames according to ASCII, UTF-8 and i18n – Festus Tamakloe Apr 07 '13 at 22:40

score 4 · Answer 2 · answered Oct 22 '15 at 23:16

4

This solved my problem: import static org.bytedeco.javacpp.opencv_imgcodecs.*;

answered Oct 22 '15 at 23:16

Fernando

51
2

This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post - you can always comment on your own posts, and once you have sufficient [reputation](http://stackoverflow.com/help/whats-reputation) you will be able to [comment on any post](http://stackoverflow.com/help/privileges/comment). – Kristijan Iliev Oct 23 '15 at 07:38
If you have a new question, please ask it by clicking the [Ask Question](http://stackoverflow.com/questions/ask) button. Include a link to this question if it helps provide context. – Joe Taras Oct 23 '15 at 08:11
@JoeTaras This is not a question. I wonder what makes you think that. Perhaps you misclicked. – Artjom B. Oct 23 '15 at 13:04
@Chris This is an attempt at an answer and not a comment. It would have been nice to see a description why this would solve the problem, but still, it's an answer. – Artjom B. Oct 23 '15 at 13:05
@ArtjomB. I try to respond, your answer does not respond to the question. Your problem can be different of problem of Lucas. – Joe Taras Oct 23 '15 at 13:06

score 3 · Answer 3 · answered Dec 20 '15 at 20:42

3

You have to add this import statement:
import static org.bytedeco.javacpp.opencv_imgcodecs.cvLoadImage; This is required so that the static method cvLoadImage can be used without using the class name.

answered Dec 20 '15 at 20:42

404error

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score 2 · Answer 4 · answered May 02 '13 at 16:45

2

You have to import com.googlecode.javacv.cpp.opencv_highgui.*;

answered May 02 '13 at 16:45

bmkay

462
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score 2 · Answer 5 · answered Sep 24 '14 at 21:26

2

With javacv 0,9 you have to import static org.bytedeco.javacpp.opencv_highgui.*;

answered Sep 24 '14 at 21:26

grzebyk

1,024
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score 1 · Answer 6 · edited Oct 18 '14 at 12:52

1

I got the same error then, i imported the following package, problem solved.

import static com.googlecode.javacv.cpp.opencv_highgui.*;

edited Oct 18 '14 at 12:52

Lucas Zamboulis

2,494
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answered Oct 18 '14 at 12:34

nuzree

11
1

score 1 · Answer 7 · answered Feb 27 '18 at 04:30

This might be old but for those who stumbled upon this problem like me just now, here is how I solved it and why:

First OP's error: Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: cvLoadImage at javacv.demo.main(demo.java:17)

This indicates that the compiler cannot find the cvLoadImage method that you are trying to call.

cvLoadImage is a static method under JavaCPP. Specifically it is a static method under opencv_imgcodecs class.

To solve this issue one must first specify the import of the opencv_imgcodecs class.

This can be done by adding the import:
import static org.bytedeco.javacpp.opencv_imgcodecs.cvLoadImage;

This in turn would result for the opencv_imgcodecs class to be usable within your class along with its static methods and other functions.

I hope this helps.

score 0 · Answer 8 · answered Mar 14 '15 at 07:01

0

Got the same problem recently. if you are using javacv-0.10 (more recent at the moment), import manually this one:

import static org.bytedeco.javacpp.opencv_highgui.*;

but the source of JRE of the project should be higher than 1.5

answered Mar 14 '15 at 07:01

Edess Elder

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score 0 · Answer 9 · answered Aug 18 '19 at 15:38

0

In my case, the problem happened when the squeegee in debug mode. Try to run in normal mode.

answered Aug 18 '19 at 15:38

Glauber Barboza

1
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JavaCV/OpenCV: cvLoadImage not working

9 Answers9