# \#pixel

**URL:** https://forum.opencv.org/tag/pixel/113.md

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## [Image dimension measurement - mm per pixel calibration](https://forum.opencv.org/t/image-dimension-measurement-mm-per-pixel-calibration/3196)

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**Author:** [@RockB](https://forum.opencv.org/u/RockB)\
**Replies:** 0\
**Last updated:** [May 6, 2021, 7:39pm UTC](https://forum.opencv.org/t/image-dimension-measurement-mm-per-pixel-calibration/3196 "2021-05-06T19:39:52Z")

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I am trying to measure dimension of an object in real time using a video feed from a camera. I am working off an single frame/image of the video for now. In order to measure the real (physical) dimensions, I want to fir…