安卓opencv人脸检测无法运行

Question

使用了opencv自带的.xml模型，但是无法正常运行，一旦运行程序就会闪退，且无报错，求救！

这个是启动模型

public void initializeOpenCVDependencies() {
        try {
            // Copy the resource into a temp file so OpenCV can load it
                 InputStream is = getResources().openRawResource(R.raw.lbpcascade_frontalface_improved);
                 File cascadeDir = getDir("cascade", Context.MODE_PRIVATE);
                 File mCascadeFile = new File(cascadeDir.getAbsoluteFile(), "lbpcascade_frontalface_improved.xml");
                 FileOutputStream os = new FileOutputStream(mCascadeFile);
                 byte[] buffer = new byte[4096];
                 int bytesRead=0;
                 while ((bytesRead = is.read(buffer)) != -1) {
                     os.write(buffer, 0, bytesRead);
                 }
                 is.close();
                 os.close();
                 // Load the cascade classifier
             detectface = new CascadeClassifier(mCascadeFile.getAbsolutePath());
        } catch (Exception e) {
            Log.e("OpenCVActivity", "Error loading cascade", e);

这个是检测模块

 srcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.a);
        grayBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), Bitmap.Config.RGB_565);
        Utils.bitmapToMat(srcBitmap, rgbMat);//convert original bitmap to Mat, R G B.

        Imgproc.cvtColor(rgbMat, grayMat, Imgproc.COLOR_RGB2GRAY);//rgbMat to gray grayMat
        MatOfRect cars=new MatOfRect();
      detectface.detectMultiScale(grayMat,car,1.1,3,0,new Size(50,50),new Size());