OpenCV3.0 - Imgcodecs.imread returns 空文件

Question

我是 OpenCV 的新手 - 在 Android.

上使用 OpenCV310

当我对一个存在的文件调用 Imgcodecs.imread 时，我总是得到一个空垫。有人可以帮助我吗？

密码是：

File root = Environment.getExternalStorageDirectory();
File file = new File(root, "1.jpg");
Log.e(getString(R.string.app_name), "File exists: " + file.exists());
Log.e(getString(R.string.app_name), "Trying to read: " + file.getAbsolutePath());
Mat BGRMat = Imgcodecs.imread(file.getAbsolutePath(),Imgcodecs.CV_LOAD_IMAGE_COLOR);
if(BGRMat.empty())
{
      Log.e(getString(R.string.app_name), "Failed, Empty! Details: " + BGRMat);
}
else
{
      Log.e(getString(R.string.app_name), "Success! Details: " + BGRMat);
}

我得到的日志是：

07-05 20:53:26.941 28555-28555/com.sunshine.spotdetector E/SpotDetector: File exists: true
07-05 20:53:26.941 28555-28555/com.sunshine.spotdetector E/SpotDetector: Trying to read: /storage/emulated/0/1.jpg
07-05 20:53:26.941 28555-28555/com.sunshine.spotdetector E/SpotDetector: Failed, Empty! Details: Mat [ 0*0*CV_8UC1, isCont=false, isSubmat=false, nativeObj=0x7f97b2a660, dataAddr=0x0 ]

提前致谢！

Answer 1

让我回答我自己的问题。这是一个愚蠢的错误：我忘了添加 android.permission.READ_EXTERNAL_STORAGE, 所以它返回 0 大小的 Mat

OpenCV3.0 - Imgcodecs.imread returns 空文件

OpenCV3.0 - Imgcodecs.imread returns empty file

android

opencv

imread