CvException error: ... in function void Java_org_opencv_android_Utils_nMatToBitmap2(JNIEnv*, jclass, jlong, jobject, jboolean)

asked 2015-01-03 23:52:27 -0500

jiarongkoh gravatar image

Hi All, I am trying to perform a simple image thresholding activity but it throws the above errors. I can't seem to tell why is it throwing these errors. I am using OpenCV 249 and working on Eclipse IDE. My codes are:

public class mainactivity extends Activity {

private Mat destination, source;
private Bitmap image;

static {

protected void onCreate(Bundle savedInstanceState) {

    Mat source = Highgui.imread(Environment.getExternalStorageDirectory()
            .getAbsolutePath() + "/CT Image/10006.bmp");

    destination = new Mat(source.rows(), source.cols(), source.type());

    Log.w("source type", String.valueOf(source.type()));
    Log.w("source rows", String.valueOf(source.rows()));
    Log.w("source columns", String.valueOf(source.cols()));
    Log.w("source width", String.valueOf(source.width()));
    Log.w("source height", String.valueOf(source.height()));
    Log.w("source size", String.valueOf(source.size()));

    destination = source;
    Imgproc.threshold(source, destination, 127, 255, Imgproc.THRESH_TOZERO);

    Log.w("destination type", String.valueOf(destination.type()));
    Log.w("destination rows", String.valueOf(destination.rows()));
    Log.w("destination columns", String.valueOf(destination.cols()));
    Log.w("destination width", String.valueOf(destination.width()));
    Log.w("destination height", String.valueOf(destination.height()));

    Highgui.imwrite("ThreshZero.jpg", destination);

    Bitmap bmp = Bitmap.createBitmap(1920, 1080, Config.ARGB_8888);
    Utils.matToBitmap(destination, bmp);
    ImageView photo = (ImageView) findViewById(;


And my logcat is:

01-04 13:42:17.210: E/AndroidRuntime(26055): Process: com.example.test1, PID: 26055

01-04 13:42:17.210: E/AndroidRuntime(26055): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test1/com.examples.test.mainactivity}: CvException [org.opencv.core.CvException: /home/reports/ci/slave_desktop/50-SDK/opencv/modules/java/generator/src/cpp/utils.cpp:97: error: (-215) src.dims == 2 && info.height == (uint32_t)src.rows && info.width == (uint32_t)src.cols in function void Java_org_opencv_android_Utils_nMatToBitmap2(JNIEnv*, jclass, jlong, jobject, jboolean)

My understanding of this logcat message is that my destination Mat and Bitmap bmp are of different 'dimensions'. I included the Log messages in my code to observe what are those 'dimensions' and these dimensions are all zeros. Anyone pls assist? In this project I am not using any jni folder.

edit retag flag offensive close merge delete