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.

Answer 1

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

eg:

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

Answer 2

这解决了我的问题： import static org.bytedeco.javacpp.opencv_imgcodecs.*;

Answer 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.

Answer 4

你必须import com.googlecode.javacv.cpp.opencv_highgui.*;

Answer 5

使用javacv 0,9，您必须import static org.bytedeco.javacpp.opencv_highgui.*;

Answer 6

我得到了同样的错误，我导入了以下包，问题解决了。

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

Answer 7

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:

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.

Answer 8

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

Answer 9

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