# Issue about Aruco tracker

**URL:** <https://discourse.slicer.org/t/issue-about-aruco-tracker/22732>\
**Category:** Support\
**Created:** [March 28, 2022, 4:59pm UTC](https://discourse.slicer.org/t/issue-about-aruco-tracker/22732 "2022-03-28T16:59:40Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![user5](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/user5/32/13217_2.png) [@user5](https://discourse.slicer.org/u/user5)\
**Post date:** [March 28, 2022, 4:59pm UTC](https://discourse.slicer.org/t/issue-about-aruco-tracker/22732/1 "2022-03-28T16:59:41Z")

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Does anybody have experience in the Aruco tracker?

I have tried to use the Aruco tracker by following this [link](https://github.com/PerkLab/PerkLabBootcamp/blob/master/Doc/day2_2_PLUS.pptx).

I generate the tracker successfully, but the moving range is very limited and it cannot move close to my model.

 ![IMG_1747](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/0/b0011e1405bbbdb73ce88c2fe1fdcdaec3e671b5.jpeg)

Did anyone face a similar problem before? If yes, would you mind telling me that how to fix this problem?  
Thank you.

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**Author:** ![user5](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/user5/32/13217_2.png) [@user5](https://discourse.slicer.org/u/user5)\
**Post date:** [March 29, 2022, 4:29am UTC](https://discourse.slicer.org/t/issue-about-aruco-tracker/22732/2 "2022-03-29T04:29:16Z")

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Since I am using the iPad to be the webcam, is it able to solve this issue by using NDI product for tracking?

Thank you

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**Author:** ![slicer365](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/slicer365/32/67549_2.png) [@slicer365](https://discourse.slicer.org/u/slicer365)\
**Post date:** [March 29, 2022, 12:05pm UTC](https://discourse.slicer.org/t/issue-about-aruco-tracker/22732/3 "2022-03-29T12:05:43Z")

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what about depth Camera（binocular camera）?

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<div class="post-metadata">

**Author:** ![user5](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/user5/32/13217_2.png) [@user5](https://discourse.slicer.org/u/user5)\
**Post date:** [March 29, 2022, 1:21pm UTC](https://discourse.slicer.org/t/issue-about-aruco-tracker/22732/4 "2022-03-29T13:21:11Z")

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![61RUKI5LI3L.AC_SL1000](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/7/57869be01e4f28369a0c1aa2d9a5307ec7636f03.jpeg)  
Is it similar to this camera?

Did you face similar problem before and fix it by using this camera?

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<div class="post-metadata">

**Author:** ![user5](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/user5/32/13217_2.png) [@user5](https://discourse.slicer.org/u/user5)\
**Post date:** [March 30, 2022, 5:09am UTC](https://discourse.slicer.org/t/issue-about-aruco-tracker/22732/5 "2022-03-30T05:09:42Z")

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Since I have changed to use MacBook webcam and smaller size aruco tracker, moving range seems better, but I still need to move very close to the camera which is not useful for real applications.

Does this problem occur to the view angle of the camera? If I need to buy a new webcam, which is view angle of camera that you would like to suggest to buy?

Thank you

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**Author:** ![JBeninca](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jbeninca/32/10039_2.png) [@JBeninca](https://discourse.slicer.org/u/JBeninca)\
**Post date:** [April 1, 2022, 2:28pm UTC](https://discourse.slicer.org/t/issue-about-aruco-tracker/22732/6 "2022-04-01T14:28:02Z")

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hello.  
We do have worked with aruco markers , in neuro navigation.  
To get some precision with them, first your image must be good enough. a common web cam , also a the Logitech Brio 4k is not good  
We choose to use a Sony a 6300 no-mirror camera. it has a resolution of 4k. but it takes some time on the loop. The resolution was dawngrade to 2 k (1920 x 1080)  
The image quality, with good ilumination was excelent and the library works fine with these images.

We had to use filters: low-pass, butterworth, or kalman to cutt off higher frecuencies (noise) to retain that movement was significant to locate an object

but there was a problem with the rotation vectors that the library gives. it has some-inherent-noise and error to give the proper results

 ![_the_Scene](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/7/17e3a3fc41f13f96ef4962aa8b6aeb243fac1568.png)