# Using fundamentalFromProjections

**URL:** <https://forum.opencv.org/t/using-fundamentalfromprojections/12748>\
**Category:** C++\
**Tags:** sfm\
**Created:** [April 10, 2023, 12:22pm UTC](https://forum.opencv.org/t/using-fundamentalfromprojections/12748 "2023-04-10T12:22:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![omkarkabadagi](https://avatars.discourse-cdn.com/v4/letter/o/3da27b/32.png) [@omkarkabadagi](https://forum.opencv.org/u/omkarkabadagi)\
**Post date:** [April 10, 2023, 12:22pm UTC](https://forum.opencv.org/t/using-fundamentalfromprojections/12748/1 "2023-04-10T12:22:55Z")

</div>

I am trying to use the function `fundamentalFromProjections` to get the fundamental matrix for my two-camera setup and use it to find the correspondence of objects between the images. I already have the projection matrix for both cameras. The output value of F though seems to be too large with ranges in 10e+8. I am not sure if the values should be this large. If anybody could help, it would be great.

Edit 1:  
This is the value of F

```auto
F = [-59703.48120005786, 661200.2547270429, -112516589.4675014;
 -43609.67723555813, -69931.00609403527, 1058492575.354406;
 53234108.75164508, -537557855.7412491, -6947884504.026414]

```