# How to draw circle in realtion to aruco marker y axis?

**URL:** <https://forum.opencv.org/t/how-to-draw-circle-in-realtion-to-aruco-marker-y-axis/1735>\
**Category:** Python\
**Tags:** aruco, imgproc\
**Created:** [February 23, 2021, 4:22pm UTC](https://forum.opencv.org/t/how-to-draw-circle-in-realtion-to-aruco-marker-y-axis/1735 "2021-02-23T16:22:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Kiwi\_gamer01](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/kiwi_gamer01/32/1109_2.png) [@Kiwi\_gamer01](https://forum.opencv.org/u/Kiwi_gamer01)\
**Post date:** [February 23, 2021, 4:22pm UTC](https://forum.opencv.org/t/how-to-draw-circle-in-realtion-to-aruco-marker-y-axis/1735/1 "2021-02-23T16:22:06Z")

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Hi

Is there a way to get a coordinate to a certain axis of a recognized aruco marker.  
It might be very simple, but i don’t get it.  
With pure understanding I would say yes because if the axes can be calculated and displayed, so objects / points or coordinates should also be able to be calculated, but hwo?

Thanks in advance!

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**Author:** ![Alejandro\_Silvestri](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/alejandro_silvestri/32/357_2.png) [@Alejandro\_Silvestri](https://forum.opencv.org/u/Alejandro_Silvestri)\
**Post date:** [March 4, 2021, 12:41pm UTC](https://forum.opencv.org/t/how-to-draw-circle-in-realtion-to-aruco-marker-y-axis/1735/2 "2021-03-04T12:41:46Z")

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Hi @Kiwi_gamer01 ,

May be `cv::aruco::detectMarkers()` is what you are looking for:  
[https://docs.opencv.org/4.5.1/d9/d6a/group\_\_aruco.html#gab9159aa69250d8d3642593e508cb6baa](https://docs.opencv.org/4.5.1/d9/d6a/group__aruco.html#gab9159aa69250d8d3642593e508cb6baa)

The `corners` output gives you the four corners of each detected marker.