Using OpenCV with QT5

Timmoth

is OpenCV compatible with QT5?
and is it the best for capturing and playing back uncompressed AVI from a capture device?

Regards,Tim.

sierdzio

AFAIK, answer to both questions are "yes" :)

Don't ask me for details, though.

Timmoth

Ok cheers, i have been looking around and there seems to be issues that exist with openCV and QT 5 which do not exist in QT 4 and id like to know if there is any simpler library's to implement for the sole purpose of video acquisition and playback?

Serenity

can you give us the issues, which doesn't exists in Qt4?

I used OpenCV with Qt4 and the only thing, I needed, was converting between the OpenCV struct and QImage. That wasn't quite difficult.

You have to try it out.

SGaist

Hi,

What can happen (depending on your system) is that you get an OpenCV pre-built with Qt 4, in that case you'll be in trouble.

But you can always build OpenCV yourself

dbzhang800

Hi, I have written two functions to do the conversion cv::Mat <==> QImage.

Maybe is useful for you
https://github.com/dbzhang800/QtOpenCV/blob/master/cvmatandqimage.h

[quote author="Serenity" date="1375873569"]can you give us the issues, which doesn't exists in Qt4?

I used OpenCV with Qt4 and the only thing, I needed, was converting between the OpenCV struct and QImage. That wasn't quite difficult.

You have to try it out. [/quote]

Serenity

[quote author="1+1=2" date="1375926119"]Hi, I have written two functions to do the conversion cv::Mat <==> QImage.

Maybe is useful for you
https://github.com/dbzhang800/QtOpenCV/blob/master/cvmatandqimage.h
[/quote]

There is an easier way with setting the pointer of the CVImage to an QImage. So, If you make any painting changes on this picture with OpenCV, you don't need to add them already to QImage.

That, he also have to do with his code. Copying every pixel from one image to another costs too much time.

EDIT: ah, I see, you have done that in the last lines of your code :)