Android Camera Preview & OpenCV for Android code snippets - All About Free

convert camera preview byte array data to bitmap

        YuvImage yuv_image = new YuvImage(imageByte, ImageFormat.NV21, width, height, null);
        Rect rect = new Rect(0, 0, width, height);
        ByteArrayOutputStream output_stream = new ByteArrayOutputStream();
        yuv_image.compressToJpeg(rect, 100, output_stream);
        byte[] byt = output_stream.toByteArray();

        Bitmap full = BitmapFactory.decodeByteArray(byt, 0, byt.length);

convert camera preview byte array data to OpenCV mat format

    Mat mYuv = new Mat(height, width, CvType.CV_8UC1);
    mYuv.put(0, 0, data);

note that you should be aware CvType.CV_8UC1, if you cannot get mat correctly, you should try CvType.CV_8UC3 instead.