# Hurry! Some problems about similarity measurement.

**URL:** https://discourse.itk.org/t/hurry-some-problems-about-similarity-measurement/6011
**Category:** Uncategorized
**Created:** [June 23, 2023, 9:57am UTC](https://discourse.itk.org/t/hurry-some-problems-about-similarity-measurement/6011 "2023-06-23T09:57:51Z")
**Posts on this page:** 1
**Showing post:** 6

<div class="post-metadata">

### Author: ![zivy](https://discourse.itk.org/user_avatar/discourse.itk.org/zivy/32/1726_2.png) [@zivy](https://discourse.itk.org/u/zivy)
#### Post date: [June 24, 2023, 6:52pm UTC](https://discourse.itk.org/t/hurry-some-problems-about-similarity-measurement/6011/6 "2023-06-24T18:52:44Z")

</div>

Hello @ljjiayou,

Please see [this discussion](https://discourse.itk.org/t/3d-multi-modal-medical-image-registration-using-user-defined-function-for-similarity-metric-computation/5064) which describes how to add a custom similarity (loss function) into ITK and then expose it in SimpleITK.

---

_[View the full topic](https://discourse.itk.org/t/hurry-some-problems-about-similarity-measurement/6011)._