# ImageFeatures.hough\_circle\_gradient example is broken

**URL:** <https://discourse.julialang.org/t/imagefeatures-hough-circle-gradient-example-is-broken/87636>\
**Category:** Signal and Image Processing\
**Tags:** question\
**Created:** [September 22, 2022, 11:15am UTC](https://discourse.julialang.org/t/imagefeatures-hough-circle-gradient-example-is-broken/87636 "2022-09-22T11:15:38Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Ondo](https://avatars.discourse-cdn.com/v4/letter/o/ecb155/32.png) [@Ondo](https://discourse.julialang.org/u/Ondo)\
**Post date:** [September 22, 2022, 11:15am UTC](https://discourse.julialang.org/t/imagefeatures-hough-circle-gradient-example-is-broken/87636/1 "2022-09-22T11:15:38Z")

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I really want to build something on the “find all circles in image” example seen near the bottom of this web-page: [Function reference · ImageFeatures](https://juliaimages.org/ImageFeatures.jl/dev/function_reference/#ImageFeatures.HOG)

Initially it worked with the provided image but gave rise to errors when supplied with a bigger tiff image (4 mb - not very big).  
I then upgraded to Julia 1.8.1 and updated packages. Now the example with the provided image also did not work. Errors were of basically two kinds: bounds errors accessing index 0 in matrices. This obviously happened inside the functions and not in anything that I wrote (which so far is nothing - I only copy-paste from the example). Parameter list mismatch with the types expected by functions is another kind of error that I encountered.  
If there are experienced users to whom it is obvious how to update the the example to work with the current Julia version, I would be most grateful for help to get there. And if there are bugs to report, I would like to know where and how to do that.

Thanks and best regards,

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**Author:** ![tim.holy](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tim.holy/32/52_2.png) [@tim.holy](https://discourse.julialang.org/u/tim.holy)\
**Post date:** [September 22, 2022, 1:37pm UTC](https://discourse.julialang.org/t/imagefeatures-hough-circle-gradient-example-is-broken/87636/2 "2022-09-22T13:37:18Z")

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I just tried the demo in 1.8 and it worked. Did you use a fresh package environment? You can hit `]` to enter package mode, and then

```julia
(@v1.8) pkg> activate --temp
  Activating new project at `/tmp/jl_1zJfQy`

(jl_1zJfQy) pkg> add Images ImageFeatures

```

should give you a “clean” environment in which to run the demo. If it works there, but not in your default 1.8 environment, you might try updating your packages and/or resolving conflicts.

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**Author:** ![Ondo](https://avatars.discourse-cdn.com/v4/letter/o/ecb155/32.png) [@Ondo](https://discourse.julialang.org/u/Ondo)\
**Post date:** [September 22, 2022, 5:49pm UTC](https://discourse.julialang.org/t/imagefeatures-hough-circle-gradient-example-is-broken/87636/3 "2022-09-22T17:49:27Z")

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Dear Tim,

Thanks for an ultra quick reply!

Alas, I really tried to avoid a pitfall of this nature by testing it 2 x 2 times: 1.6.2 and 1.8.1 on Linux and on Mac with identical results. But I will use the weekend to see if your solution will work for me.

Best regards,