if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
        if (resultCode == RESULT_OK) {
            Mat img = Highgui.imread(file.getAbsolutePath());
            if(img!=null)
                n.detectDocument(img.getNativeObjAddr());

jbyteArray JNICALL Java_com_example_superemr_NSuperEMR_detectDocument(JNIEnv *env, jobject object, jlong addr)
{
    Mat* image = (Mat*) addr;
    imwrite("/mnt/sdcard/work/hala.jpg",*image);
    return NULL;
}