# Detecting crosses in grids

**URL:** <https://discourse.julialang.org/t/detecting-crosses-in-grids/6720>\
**Category:** General Usage\
**Tags:** question, machinevision\
**Created:** [October 27, 2017, 1:43pm UTC](https://discourse.julialang.org/t/detecting-crosses-in-grids/6720 "2017-10-27T13:43:44Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Post date:** [October 29, 2017, 10:15am UTC](https://discourse.julialang.org/t/detecting-crosses-in-grids/6720/10 "2017-10-29T10:15:36Z")

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Just a thought: regardless of the method you end up working with, removing that barrel distortion may help significantly. It should be easy with, for example, [LensFun](http://lensfun.sourceforge.net/), especially if it already contains your lens, otherwise you can calibrate and add it.

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