Android OpenCV图像转换

 public void saveMatData(Mat mat) {

        File fileDir = new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES), "mybook");
        if (!fileDir.exists()) {
            fileDir.mkdirs();
        }
        String name = String.valueOf(System.currentTimeMillis()) + "_book.jpg";
        File tempFile = new File(fileDir.getAbsoluteFile() + File.separator, name);
        Imgproc.cvtColor(mat, mat,Imgproc.COLOR_RGB2BGR);//保存到本地的颜色值，如果不转换默认是红色值，因为Mat默认是BGR格式
        Imgcodecs.imwrite(tempFile.getAbsolutePath(), mat);
        Log.e("存储", "FielSaveMatData" + tempFile.getPath());
  }
 public void sa