How to read OpenCV Mat Object from file in Android?

Question

I have a Bag Of Words dictionary created on my computer and saved to xml file. I'm creating an app for Android and I need to use it. Unfortunately according to Andrey Smorodov's answer it turns out that I can't use the OpenCV FileStorage class, for some reason. Do you have any idea what approach should I use? Can you give an example or reference? Also I'm going to use SVM, so will I have problem with svm.load("classifier.xml")? I'm using Android NDK but I don't mind if I should do this in Java.

Unfortunately I found out that I can't use the OpenCV FileStorage class, for some reason. What is that reason? — BlamKiwi
– BlamKiwi, Commented Feb 10, 2015 at 20:56
svm.load() should work. what does not work here, is opening an arbitrary Filestorage, and reading Mat's from that. (unless you outsource that to jni) — berak
– berak, Commented Feb 10, 2015 at 21:02
So you tell me that I can use FileStorage without problem if I use it in my native part? — dephinera
– dephinera, Commented Feb 10, 2015 at 21:05
haven't tried, but i guess, very much so. themain obstacle (in java) is just, that there are no overloaded operators like '>>' . but no prob in c++ ! — berak
– berak, Commented Feb 10, 2015 at 21:07

Ken · Accepted Answer · 2015-04-14 19:16:18Z

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I was also having trouble with FileStorage in native code. I was getting a SIGABRT crash with no useful message. The solution for me was to add READ_EXTERNAL_STORAGE to the permissions in my AndroidManifest.xml. Now it works just fine.

answered Apr 14, 2015 at 19:16

Ken

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dephinera · Accepted Answer · 2015-04-14 19:33:16Z

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So I successfully used FileStorage in the native code. I read my files properly. Don't forget to add the READ_EXTERNAL_STORAGE permission in the manifest. (Like @Ken said)

edited Apr 14, 2015 at 19:33

answered Feb 10, 2015 at 22:38

dephinera

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