Using JavaCV Stitching for Android Phone

Question

I Use JavaCV On Android 4.0.3 it run to error with

OpenCV Error: Assertion failed (ssize.area() > 0) in unknown function, file C:\slave\WinInstallerMegaPack\src\opencv\modules\imgproc\src\imgwarp.cpp, line 1432

Finding features...

Exception in thread "main" java.lang.RuntimeException: C:\slave\WinInstallerMegaPack\src\opencv\modules\imgproc\src\imgwarp.cpp:1432: error: (-215) ssize.area() > 0

at com.googlecode.javacv.cpp.opencv_stitching$Stitcher.stitch(Native Method)

at Lesson3_Stitch.main(Lesson3_Stitch.java:17)

Anyone can teach me how to fix it ? Thank you.

this is my code :

public static void main(String[] args) {

        Stitcher stitcher = Stitcher.createDefault(true);
        MatVector images = new MatVector(2);
        images.put(0, cvLoadImage("sample1.png"));
        images.put(1, cvLoadImage("sample2.png"));

        IplImage result = new IplImage();

        int status = stitcher.stitch(images, images);

        if (status != Stitcher.OK) {

            cvSaveImage("result.png", result);
            System.out.println("cant stitch image" + status);

        }

        result = cvLoadImage("sample1.png");

        final CanvasFrame canvas = new CanvasFrame("My Image", 1);

        // Request closing of the application when the image window is closed.
        canvas.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);

        // Show image on window.
        // canvas.showImage(result);

    }

    private static void cvSaveImage(String string, IplImage result) {
        // TODO Auto-generated method stub

    }

    private static IplImage cvLoadImage(String string) {
        // TODO Auto-generated method stub
        return null;
    }

Answer 1

You need to import OpenCV for Android however you code cannot work due you use a custom function for cvLoadImage which returns null. This cannot work.

You could try to use CV.loadImage or some variations. Right now I have no OpenCV installation for testing.