# How to detect the number of noise point in image

**URL:** <https://forum.opencv.org/t/how-to-detect-the-number-of-noise-point-in-image/3874>\
**Category:** C++\
**Created:** [June 16, 2021, 8:17am UTC](https://forum.opencv.org/t/how-to-detect-the-number-of-noise-point-in-image/3874 "2021-06-16T08:17:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![silent-alexA](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@silent-alexA](https://forum.opencv.org/u/silent-alexA)\
**Post date:** [June 16, 2021, 8:17am UTC](https://forum.opencv.org/t/how-to-detect-the-number-of-noise-point-in-image/3874/1 "2021-06-16T08:17:01Z")

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Hi guys:  
as you seen in topic, I’m very new to opencv, can you give an assistance to me about how to count the number of noise point that was prescribed between min value and max value.

please give the details code on how to calculate it, Thanks!

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**Author:** ![kbarni](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/kbarni/32/26_2.png) [@kbarni](https://forum.opencv.org/u/kbarni)\
**Post date:** [June 16, 2021, 10:59am UTC](https://forum.opencv.org/t/how-to-detect-the-number-of-noise-point-in-image/3874/2 "2021-06-16T10:59:10Z")

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1. I don’t understand the problem. the noise is by definition a (random) _signal_, not a _point_. Can you post an image to explain?
2. Please don’t ask for code! We are here to help if you don’t understand, not to solve your homework!