Camera on android

[alexsilva]

Log error: http://pastebin.com/LwgjpMqQ

. / distribute.sh-m "pil Kivy pygame opencv"

error: Recipe opencv does not exit

opencv is not included in the "recipes dir".

How to fix it?
Thank you.

[tito]

There is no camera implementation in Kivy right now. And we never said than opencv was available on python-for-android too.

The list of available recipes can be retrieved with ./distribute.sh -l
Or browisng https://github.com/kivy/python-for-android/tree/master/recipes

The fix is... to do it.

[alexsilva]

So if I only include "opencv" the process of compiling the camera will work?
Keep in mind that I started using "Kivy" very recently.

[alexsilva]

I disagree with this statement:

• "There is no camera implementation in Kivy right now"
• http://kivy.org/docs/api-kivy.uix.camera.html

I agree with the statement:

• "And we never said than opencv was available on python-for-android too"

Ok, no problem.

• "The fix is... to do it."

[tito]

There is no camera implementation in Kivy "for android platform". :) You are on the python/android project, so the context was implies.

The issue is not only to get opencv compiled for ARM/android, but also implement a provider for android. It seem that OpenCV have now a camera support for android, but it need a closer look to see how it need to be integrated into our java code, and if it's still possible to use their Python API. Or another way.

[barius]

WRT OpenCV for Android, I managed to compile it for Python and successfully imported it in Python. However camera functionality in OpenCV is somehow broken in Kitkat 4.4.2.

[venthur]

Do you mean you compiled the OpenCV Python library for arm/android using python-for-android? If yes, would you mind sharing the recipe?

[barius]

Hi Bastian Venthur,

I did compiled the OpenCV Python library for Android(ARM). However, I
didn't write any recipe files to achieve this. It was done by creating a
new Android project in ADT, and feeding everything the cross compiler
needed into the project.
More specifically, the OpenCV building environment uses some automatic
wrapper for Python library generation. During compile time, some header
files are generated by the wrapper to provide C++-Python interoperability
and functionality. However the OpenCV CMake environment disables Python
library generation for Android, so these header files are not created.
One can simply put the generated headers from a Linux OpenCV for Python
build into the Android project, and put the pre-compiled opencv_java.so
library for Android into the same project and compile. Then you can get a
fully-functional cv2.so for Android (or partially-functional for it doesn't
support HighGUI).
I can send you a copy of the Eclipse project I used to build the library,
if you need.

Regards,

Peng

2014-05-23 6:21 GMT+08:00 Bastian Venthur notifications@github.com:

Do you mean you compiled the OpenCV Python library for arm/android
using python-for-android? If yes, would you mind sharing the recipe?

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/75#issuecomment-43951254
.

[AshokEmrys]

Hi barius,

I am trying to do the same, wrap opencv with python for android.
I am relatively new to android, it would be much helpful if you could share the procedure you followed and the required project files.

Regards,
Ashok

[barius]

@ParokshaX @venthur
Here I attach the Eclipse project I have made to build libcv2.so for Python on Android. It is a little bit messy because I really had a headache working it out, and I'm short on time right now.
Just import it into Eclipse (I use ADT 22.0 and NDK r9c) and it should compile. I took libopencv_java.so into the project so it shall be a dependency. Also libpython2.7.so is a dependency too.
If anyone can make this into a Python for Android recipe then that would be awesome.

The link:
https://drive.google.com/file/d/0B7iBG-Vnm4w1SjFhXzItSmQ5OG8/edit?usp=sharing

Regards,

Peng

[AshokEmrys]

@barius
Thanks, I managed to build it by using opencv's cmake, however I have problem with the numpy recipe!

[barius]

@ParokshaX
Glad to hear that you worked it out.
About numpy, AFAIK you cannot build P4A w/o Kivy, e.g.this works fine
./distribute.sh -d dist1 -m numpy pil kivy
but
./distribute.sh -d dist1 -m numpy pil
does not.
No idea what your case is, just trying to help.

[AshokEmrys]

@barius
I used ./distribute.sh -m openssl pil kivy numpy but it failed with numpy as it is trying to build lapack library which requires gfortran for arm which is not provided by android-ndk, the patch provided in the recipe doesn't seem to work, could be relative to the distro (arch linux) i am using. Have to dig into it further to find where it went wrong.

Is it possible that you could share the numpy-android which you built, so I can test run the opencv I built using cmake and verify its integrity?

[barius]

try put numpy in front of kivy first 😁
2014-7-25 上午12:20于 "Ashok Kumar P (ParokshaX)" notifications@github.com写道：

@barius https://github.com/barius
I used ./distribute.sh -m openssl pil kivy numpy but it failed with numpy
as it is trying to build lapack library which requires gfortran for arm
which is not provided by android-ndk, the patch provided in the recipe
doesn't seem to work, could be relative to the distro (arch linux) i am
using. Have to dig into it further to find where it went wrong.

Is it possible that you could share the numpy-android which you built, so
I can test run the opencv I built using cmake and verify its integrity?

—
Reply to this email directly or view it on GitHub
#75 (comment)
.

[AshokEmrys]

@barius
tried, still the same error

[barius]

@ParokshaX
sorry for the delay, here is the numpy library I compiled. have fun
https://drive.google.com/file/d/0B7iBG-Vnm4w1WmxVQS1JREwtRzQ/edit?usp=sharing