How to use Aruco in Android?

asked Apr 10 '18

Sellmair
21 ●1 ●3

Hi, I was not able to find the Aruco package documented here https://docs.opencv.org/trunk/javadoc... (v.3.4.1)

in the SDK provided here https://sourceforge.net/projects/open...

Is there a way to use the Auroc package for Android?

Thanks in advance :)

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answered Dec 8 '18

Sellmair
21 ●1 ●3

We published packaged .aar builds for opencv android to jcenter. Feel free to use our packages: https://github.com/quickbirdstudios/o...

dependencies {

  // opencv 3.4.1
  implementation 'com.quickbirdstudios:opencv:3.4.1'

  // opencv 3.4.4 with contribution packages
  implementation 'com.quickbirdstudios:opencv:3.4.4-contrib'
}

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that's a nice attempt, but are you going to maintain that in the future ?

berak (Dec 9 '18)edit

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answered May 8 '18

mshabunin
1927 ●10 ●31

Please check build logs from our CI builder: http://pullrequest.opencv.org/buildbo... For example: http://pullrequest.opencv.org/buildbo... It had built OpenCV Android SDK with contrib successfully.

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This post helps. I spent days trying to build opencv contrib for android with no success.

syaifulnizamyahya (Nov 12 '18)edit

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answered Apr 10 '18

berak
32993 ●7 ●81 ●312

updated Apr 10 '18

the aruco module is from opencv_contrib , and it's not included in the prebuilt android sdk from SF.

you'll have to download the contrib repo, and rebuild the sdk from src

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Hey, thanks for your quick answer! I tried to build from source and tried many things, but it always fails with the output below. Tried build tools version 24.4.1, 25, 27 Tried ndk version 10, 15, 16

/opencv/platforms/android/build/o4a/android_sdk/AndroidManifest.xml
[1025/1193] Linking CXX executable bin/hello-android
ninja: build stopped: subcommand failed.
Traceback (most recent call last):
  File "../build_sdk.py", line 363, in <module>

Sellmair (Apr 10 '18)edit

https://github.com/ninja-build/ninja/...

berak (Apr 10 '18)edit

I am sorry for opening a duplicate, but could you please give me more information? I used ninja version 1.8.2 if this was your hint?

Sellmair (Apr 10 '18)edit

it did not find it (i dont think the version is a problem)

if youcan just type "ninja" on you cmdline, and it runs, it's all fine, else you have to put it on the PATH or such

berak (Apr 10 '18)edit

Then ninja looks fine! I would only need to build the jniLib .so files to make it work, as the java code is already generated. Maybe I can find a workaround? I successfully built OpenCV with the contrib module. It only fails for the android_sdk =(

Sellmair (Apr 10 '18)edit

This is my build command:

python ../build_sdk.py --extra_modules_path=/Users/sellmair/0source/opencv/opencv_contrib/modules --ndk_path=/Users/sellmair/Desktop/android-ndk-r15c --sdk_path=/Users/sellmair/Desktop/tools --no_ccache . /Users/sellmair/0source/opencv/opencv/

Sellmair (Apr 10 '18)edit

wait, can you try with an older ndk, like 10 or 12 ? (15 might be too advanced)

berak (Apr 10 '18)edit

I also tried 10e. I am really frustrated =(

Sellmair (Apr 10 '18)edit

I am trying version 9 now! Hopefully this helps!

Sellmair (Apr 10 '18)edit

Did not work =/

Sellmair (Apr 10 '18)edit

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