fit_affine_dfield(1)

📦
version 3.3.1p2 · 7 versions
, in ubuntu stonking

💖 fit_affine_dfield — bestie edition 💖

okay so this is a page from The Computational Morphometry Toolkit, aka fit_affine_dfield(1), and it's lowkey one of the most useful little tools in the whole toolkit. sit down, grab a strawberry 🍓, and let's get into it.

✨ NAME ✨

fit_affine_dfield — Fit Affine Transformation to Nonrigid Transformation

like... it fits an affine transform to a nonrigid one. the name ate, honestly. 💅

🎀 SYNOPSIS 🎀

fit_affine_dfield InputDField OutputXform

two arguments, that's it, no cap. she's simple, she's elegant, she's doing the most with the least. 👑

🦋 DESCRIPTION 🦋

So the whole vibe here is: you have a nonrigid transformation — and that could be either

  • a B-spline free-form deformation, or
  • a non-parametric deformation field

...and this tool fits a linear affine transformation to it. Like, it takes your bendy squishy wiggly warp and finds the best straight-ish linear affine approximation of it. it's giving "distilling the chaos into one tidy matrix." iconic behaviour, fr fr. 🌈

👑 OPTIONS 👑

🌸 Global Toolkit Options (these are shared by all CMTK tools) 🌸

bestie these aren't even special to this tool — every single CMTK tool has them. they're the communal snacks of the toolkit. 🫶

  • --help — writes the list of basic command line options to standard output. your emergency "what do i even type" button. 🙈
  • --help-all — writes the complete list of basic and advanced command line options to standard output. the deluxe version. the director's cut. ⭐
  • --wiki — writes the list of command line options to standard output in MediaWiki markup. for when you're being fancy on a wiki. ✨
  • --man — writes man page source in 'nroff' markup to standard output. yes, the very genre of document you're reading right now. inception moment. 😭
  • --version — writes the toolkit version to standard output. receipts, always. 🧾
  • --echo — writes the current command line to standard output. so you can see exactly what you just did. very "not me forgetting my own flags" energy. 💀
  • --verbose-level <integer> — set the verbosity level. dial it up, dial it down, you're in control. 🎚️
  • --verbose, -v — increment verbosity level by 1. ⚠️ deprecated — it's supported for backward compatibility, but like, it's giving throwback. still here for you though. 💜
  • --threads <integer> — set maximum number of parallel threads (for POSIX threads and OpenMP). go fast, girl. 🔥

🫶 AUTHORS 🫶

Torsten Rohlfing, with contributions from Michael P. Hasak, Greg Jefferis, Calvin R. Maurer, Daniel B. Russakoff, and Yaroslav Halchenko.

the whole squad, credited, as they should be. 🌟

📜 LICENSE 📜

http://www.fsf.org/licensing/licenses/gpl.html

yeah. it's the GPL. go read it, bestie, it's good for you. 💅

💀 BUGS 💀

Report bugs at http://nitrc.org/projects/cmtk/

not me finding a bug — but if you do, tell them, don't just suffer in silence. they wanna know. fr. 🙈

🌈 ACKNOWLEDGMENTS 🌈

CMTK is developed with support from the NIAAA under Grant AA021697, National Consortium on Alcohol and Neurodevelopment in Adolescence (N-CANDA): Data Integration Component. From April 2009 through September 2011, CMTK development and maintenance was supported by the NIBIB under Grant EB008381.

funding is the real main character energy here, let's be honest. no grant, no toolkit. 🧚

⚠️ quick vibe check: the deprecated flags still work, the options are exactly the ones listed above, and the arguments are exactly InputDField and OutputXform. do not freestyle the flags. i'm watching. 👀

okay that's the whole page, you're so welcome, mwah. 💖✨🎀

CMTK 3.3.1p2 — dated Jun 24 2026 — that's the version and the date, bestie, all tucked in right here at the end like a little bow. 🎀 bye!! 🦋

📦 where this page comes from