Newer version of OpenCV Manager

[ghost]

Currently latest OpenNoteScanner provide for direct download OpenCV Manager 3.1.0:

• https://github.com/ctodobom/opencv/releases

Steps to reproduce

• Launch OpenNoteScanner;
• Allow direct download OpenCV Manager.

Expected behaviour

1. Proposed OpenCV Manager for direct download should be up to date (but still running on Android 5.0).
2. Manually installed newer version of OpenCV Manager should be supported by OpenNoteScanner.

Actual behaviour

From README.md

Because of the version of OpenCV that is used in the project it needs to run on Android 5.0 (lollipop) or newer.

In order to capture and manipulate images Open Note Scanner depends on having the OpenCV Manager application installed. If not installed Open Note Scanner will ask to download it from https://github.com/ctodobom/OpenCV-3.1.0-Android or from Google Play Store.

There are few issues:

• Linked repo to OpenCV Manager downloads in README.md is wrong!
  • ~~https://github.com/ctodobom/OpenCV-3.1.0-Android~~
  • https://github.com/ctodobom/opencv/releases/tag/3.1.0
• OpenCV Manager 3.1.0 is little outdated and there are newer versions:
  • https://github.com/opencv/opencv/releases
• OpenCV Manager fully REMOVED from Google Play?
  • https://github.com/opencv/opencv/issues/8120
  • ~~https://play.google.com/store/apps/details?id=org.opencv.engine~~
• OpenCV Manager NOT available on F-Droid (need request it for inclusion to official F-Droid repo @IzzySoft ? ), but it should be as it is hardcoded dependency of OpenNoteScanner (F-Droid users should not download it from GitHub):
  • https://github.com/ctodobom/OpenNoteScanner/issues/114#issuecomment-386801562
  • https://f-droid.org/repository/browse/?fdid=com.todobom.opennotescanner

Would you like to work on the issue?

Testing.

[IzzySoft]

If it's not there (and not in Archive either – just checked, it's not in either): yes, you'd need to file an RFP for it to have it included.

[allgood]

I will correct README.md to reflect the current status. It is only wrong because OpenCV Manager was removed from Google Play.

Newer versions implies in changes on the code, currently suggested use of OpenCV is to embed binaries on the apk, this makes the apk file huge in order to support all architectures (don't know if F-droid allows different apks for different architectures), and, this will also demand setting of an anti-feature on the listing.

I tried to build packages of OpenCV directly from source, without sucess, if somebody helps me on building ONS + OpenCV libs directly from source into an APK of ONS, this help is welcome.

[IzzySoft]

currently suggested use of OpenCV is to embed binaries on the apk

which then renders the app inacceptable for F-Droid, which requires that all is build from source and the source tree has no blobs (apart from "image stuff", i.e. PNG, JPG etc).

[allgood]

@IzzySoft I think that it is possible to build the OpenCV binaries together with the ONS build process, then it is acceptable for f-droid, but I am lacking the knowledge on doing it.

[allgood]

I think it is also possible to compile only the subset of OpenCV C++ native code that Open Note Scanner uses, this way apk would be much smaller, but the amount of work on discovering how to do this is probably huge.

[ghost]

On F-Droid there is Identify Dog Breads app that use some sort of CV engine (OpenCV?) and has no external dependency on OpenCV Manager:

• https://github.com/j05t/dbclf

[IzzySoft]

@ctodobom yes, and me too (i.e. it's possible, and I have no idea either, not being an Android dev).

[allgood]

On F-Droid there is Identify Dog Breads app that use some sort of CV engine (OpenCV?) and has no external dependency on OpenCV Manager:

No, it is using the tensorflow Artificial Intelligence API, to which it sends the image in order to get the dog's breed.

[allgood]

Correction... looks like it have a tensorflow dataset inside the app. I do not know how tensorflow AI works, then my previous mistake.

[apiraino]

Hello, found this issue while searching for a solution: I've downloaded Open Note Scanner from F-Droid but I can't download the OpenCV SDK dependency.

Open Note Scanner from Google Play installs a working version of the app. I assume this is the only workaround until a solution is found for this issue?

Thanks

[darkdragon-001]

@ctodobom I found this tutorial for building a subset of OpenCV and including it in an Android app: https://www.sisik.eu/blog/android/ndk/opencv-without-java

[ghost]

I found this tutorial for building a subset of OpenCV and including it in an Android app:

• https://www.sisik.eu/blog/android/ndk/opencv-without-java

Cool! And here is example app sources described in this tutorial:

• https://github.com/sixo/opencv-sample

[allgood]

great, bookmarked to take a look.

main problem I think is that the whole build process must be automated to run on f-droid build servers.

best regards, Claudemir

Em qui, 5 de set de 2019 às 14:28, app4soft [email protected] escreveu:

I found this tutorial for building a subset of OpenCV and including it in an Android app:

• https://www.sisik.eu/blog/android/ndk/opencv-without-java

Cool! And here is example app sources described in this tutorial:

• https://github.com/sixo/opencv-sample

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[IzzySoft]

Yes, there's that. But this part currently missing keeps many F-Droid users from using your app – who otherwise would love to (myself included). So if it is not too much trouble, it would certainly be worth it.

For an interim: If you could get it to build at all, ping me and I could take it into my repo until it's completely ready for the official one. That would at least keep Play Store out of the equation for those who want to keep it out. Of course the final goal should be having it in the official repo.

[opusforlife2]

@ctodobom Did you get the chance to look at this again?

[allgood]

@opusforlife2 , unfortunately not. Priorities are making me away of ONS development. From time to time I check if there is some contributions and accept pull requests. For now this is all I can do.

[xordspar0]

don't know if F-droid allows different apks for different architectures

Yes, it runs the build once for each architecture and builds one apk for each one. If we compiled OpenCV as part of the build, we wouldn't have a huge apk that has support for all arches.

[xordspar0]

That's not quite true, actually. It's possible, but it doesn't happen by default. Here are some issues with more information:

• https://gitlab.com/fdroid/fdroiddata/issues/1109
• https://gitlab.com/fdroid/fdroidserver/issues/82