# How to add cv::calcHist()

**URL:** <https://forum.opencv.org/t/how-to-add-cv-calchist/6818>\
**Category:** C++\
**Created:** [December 21, 2021, 10:55am UTC](https://forum.opencv.org/t/how-to-add-cv-calchist/6818 "2021-12-21T10:55:53Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![El\_Mehdi\_AKKOUCHE](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/el_mehdi_akkouche/32/4061_2.png) [@El\_Mehdi\_AKKOUCHE](https://forum.opencv.org/u/El_Mehdi_AKKOUCHE)\
**Post date:** [December 21, 2021, 10:55am UTC](https://forum.opencv.org/t/how-to-add-cv-calchist/6818/1 "2021-12-21T10:55:53Z")

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I’m on ubuntu and I’m using VSC, when I type cv::calcHist() it seems i dont have this function. How can I add it ?

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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:** [December 21, 2021, 2:01pm UTC](https://forum.opencv.org/t/how-to-add-cv-calchist/6818/2 "2021-12-21T14:01:20Z")

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> [@El\_Mehdi\_AKKOUCHE](#):
>
> it seems i dont have this function. How can I add it ?

this is very unlikely.  
did you

```
#include <openv2/imgproc.hpp>

```

??

[please also see tutorial](https://docs.opencv.org/4.x/d8/dbc/tutorial_histogram_calculation.html)

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**Author:** ![El\_Mehdi\_AKKOUCHE](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/el_mehdi_akkouche/32/4061_2.png) [@El\_Mehdi\_AKKOUCHE](https://forum.opencv.org/u/El_Mehdi_AKKOUCHE)\
**Post date:** [December 21, 2021, 4:41pm UTC](https://forum.opencv.org/t/how-to-add-cv-calchist/6818/3 "2021-12-21T16:41:33Z")

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Yes I have mentionned all the includes like the tutorial.

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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:** [December 21, 2021, 4:49pm UTC](https://forum.opencv.org/t/how-to-add-cv-calchist/6818/4 "2021-12-21T16:49:48Z")

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then, please _show_, what you’re doing, and resulting errors

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**Author:** ![crackwitz](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/crackwitz/32/14_2.png) [@crackwitz](https://forum.opencv.org/u/crackwitz)\
**Post date:** [December 21, 2021, 7:45pm UTC](https://forum.opencv.org/t/how-to-add-cv-calchist/6818/5 "2021-12-21T19:45:52Z")

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related:

> <https://stackoverflow.com/questions/70434574/how-to-add-cvcalchist-function>