How to use Aruco in Android?

asked 2018-04-10 02:56:35 -0600

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 2018-12-08 11:53:49 -0600

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 ( 2018-12-08 20:45:05 -0600 )edit

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answered 2018-05-08 05:11:26 -0600

mshabunin
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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 ( 2018-11-11 22:06:00 -0600 )edit

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answered 2018-04-10 03:01:56 -0600

berak
32993 ●7 ●81 ●312

updated 2018-04-10 03:04:43 -0600

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 ( 2018-04-10 08:32:28 -0600 )edit

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

berak ( 2018-04-10 08:45:51 -0600 )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 ( 2018-04-10 08:51:41 -0600 )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 ( 2018-04-10 09:10:37 -0600 )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 ( 2018-04-10 09:19:02 -0600 )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 ( 2018-04-10 09:27:50 -0600 )edit

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

berak ( 2018-04-10 09:36:31 -0600 )edit

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

Sellmair ( 2018-04-10 09:43:29 -0600 )edit

I am trying version 9 now! Hopefully this helps!

Sellmair ( 2018-04-10 10:10:55 -0600 )edit

Did not work =/

Sellmair ( 2018-04-10 10:44:47 -0600 )edit

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