# I want to use a filter to detect line

**URL:** <https://forum.opencv.org/t/i-want-to-use-a-filter-to-detect-line/17325>\
**Category:** Python\
**Created:** [April 18, 2024, 5:52am UTC](https://forum.opencv.org/t/i-want-to-use-a-filter-to-detect-line/17325 "2024-04-18T05:52:07Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tushar](https://avatars.discourse-cdn.com/v4/letter/t/5fc32e/32.png) [@tushar](https://forum.opencv.org/u/tushar)\
**Post date:** [April 18, 2024, 5:52am UTC](https://forum.opencv.org/t/i-want-to-use-a-filter-to-detect-line/17325/1 "2024-04-18T05:52:07Z")

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hello,

I am using a opencv library in one of my project and I have image of NDT films and I am trying to use filter to detect line but I can not detect those line in all images .

i have some image which is uploading here.

 ![9](https://us1.discourse-cdn.com/flex020/uploads/opencv/original/2X/2/29af5a2689e3aecd1b55fd754fa7ede8466a79e6.jpeg)