# Which functions / classes / namespaces of OPENCV need a qt library?

**URL:** <https://forum.opencv.org/t/which-functions-classes-namespaces-of-opencv-need-a-qt-library/5955>\
**Category:** Uncategorized\
**Created:** [October 29, 2021, 11:43am UTC](https://forum.opencv.org/t/which-functions-classes-namespaces-of-opencv-need-a-qt-library/5955 "2021-10-29T11:43:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Mahdi](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/mahdi/32/3459_2.png) [@Mahdi](https://forum.opencv.org/u/Mahdi)\
**Post date:** [October 29, 2021, 11:43am UTC](https://forum.opencv.org/t/which-functions-classes-namespaces-of-opencv-need-a-qt-library/5955/1 "2021-10-29T11:43:02Z")

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hi 🙂  
i want know Which functions / classes / namespaces of OPENCV need a qt library?  
for example i test this function `cv::createButton` and i see i must install qt, i don’t want test all functions/classes/namespaces 😬 to understand which ones need qt and which ones do not.

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**Author:** ![sturkmen](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/sturkmen/32/13_2.png) [@sturkmen](https://forum.opencv.org/u/sturkmen)\
**Post date:** [October 29, 2021, 11:45am UTC](https://forum.opencv.org/t/which-functions-classes-namespaces-of-opencv-need-a-qt-library/5955/2 "2021-10-29T11:45:51Z")

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see [OpenCV: Qt New Functions](https://docs.opencv.org/master/dc/d46/group __highgui__ qt.html)

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**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\
**Post date:** [October 29, 2021, 1:04pm UTC](https://forum.opencv.org/t/which-functions-classes-namespaces-of-opencv-need-a-qt-library/5955/3 "2021-10-29T13:04:07Z")

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the [cvv module](https://docs.opencv.org/master/d7/dcf/tutorial_cvv_introduction.html) (from contrib) would also use qt