Support for OpenCV viz module?

[damzam]

I have the following installed in a virtualenv with Python 3.6.4:

opencv-python==3.4.0.12
opencv-contrib-python==3.4.0.12

on a OSX 10.13.3. I had expected the compiled viz code and corresponding Python bindings.

https://docs.opencv.org/3.4.1/d9/d62/namespacecv_1_1viz.html

Neither of them are present. I'd never installed OpenCV on this machine. I've historically gone through the installation process manually, which isn't pleasant, and I've been able to access the viz module both via C++ and Python on Linux and Mac.

The prospect of being able to install everything without having to compile binaries is compelling, and I'd love for this to work. Is this behavior expected? If so, is there any plan to support the viz module in the future?

[skvark]

Afaik viz module requires that OpenCV is built with VTK. These packages are not built with it.

It might be possible to enable the viz module in the future given that:

• VTK can be built or installed easily to the CI environments (Windows, macOS and CentOS 5)
• VTK license allows redistribution

[damzam]

Yep...that was definitely a requisite step when building and installing manually. And getting Qt and VTK to play nice with each other and native graphics drivers has introduced some pain points...at least for me.

Many thanks for the quick response!

[skvark]

I'll look into this after I've solved some issues which are currently blocking Linux builds.

[damzam]

Thanks very much. You're doing great work!

[AlejandroSilvestri]

@damzam , did you managed to use Viz on Python?

I used it with C++ on Linux, but many people use opencv with Python on Windows and they complain about not having viz.

What are the steps to get Viz running on Python?

And, because there's no documentation about vis for Python, any suggestion about how to use de methods?

Thank you

[damzam]

No. I ended up just writing the libraries I needed in C++. Sorry not be of more help.

…

On Fri, Dec 6, 2019 at 5:27 AM AlejandroSilvestri ***@***.***> wrote: @damzam <https://github.com/damzam> , did you managed to use Viz on Python? I used it with C++ on Linux, but many people use opencv with Python on Windows and they complain about not having viz. What are the steps to get Viz running on Python? And, because there's no documentation about vis for Python, any suggestion about how to use de methods? Thank you — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#76>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAH55PH4ZTD2VKBOX3ESYWLQXJHMFANCNFSM4EUOCDFA> .

[asmorkalov]

Related discussion in OpenCV: opencv/opencv#19490

[plutonium-239]

Was this ever solved?
Do I just need to build VTK and then pip install --no-binaries opencv-contrib-python?

[AlejandroSilvestri]

@plutonium-239

No, it doesn't.
Python has a number of ways for 3d graphics.
I believe there's no need to adopt VTK on Python, other than easy portability from C++.