---
name: "cmtk-levelset"
section: "1"
platform: "linux"
package: "cmtk"
version: "3.3.1p2+dfsg-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/cmtk-levelset"
---

# cmtk-levelset(1)

Levelset segmentation

## NAME

levelset - Levelset segmentation

## SYNOPSIS

**levelset** InputImage OutputImage

## DESCRIPTION

Levelset-type segmentation of foreground/background using minimum regional variance energy

## OPTIONS

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

- **--help**

  Write list of basic command line options to standard output.

- **--help-all**

  Write complete list of basic and advanced command line options to standard output.

- **--wiki**

  Write list of command line options to standard output in MediaWiki markup.

- **--man**

  Write man page source in 'nroff' markup to standard output.

- **--xml**

  Write command line syntax specification in XML markup (for Slicer integration).

- **--version**

  Write toolkit version to standard output.

- **--echo**

  Write the current command line to standard output.

- **--verbose-level** *\<integer\>*

  Set verbosity level.

- **--verbose**, **-v**

  Increment verbosity level by 1 (deprecated; supported for backward compatibility).

- **--threads** *\<integer\>*

  Set maximum number of parallel threads (for POSIX threads and OpenMP).

### Main Options

- **--binarize**, **-b**

  Binarize levelset and write as byte mask, rather than write floating-point levelset function itself.

### These parameters control the initialization of the levelset function

- **--scale-initial-sphere** *\<double\>*

  Scale factor to reduce or increase the size of the initial foreground region sphere. **\[Default: 1\]**

### These parameters control the evolution of the levelset function

- **--iterations** *\<integer\>*, **-n** *\<integer\>*

  Maximum number of iterations **\[Default: 100\]**

- **--force-iterations**, **-f**

  Force given number of iterations, even when convergence has been detected

- **--filter-sigma** *\<double\>*, **-s** *\<double\>*

  Gaussian filter sigma in world coordinate units (e.g., mm) **\[Default: 2\]**

- **--delta** *\<double\>*, **-d** *\<double\>*

  Time constant for levelset evolution; must be \> 0; larger is faster **\[Default: 0.1\]**

- **--levelset-threshold** *\<double\>*, **-t** *\<double\>*

  Levelset threshold: levelset function is truncated at +/- this value **\[Default: 1\]**

### Image/Transformation Database

- **--db** *\<string\>*

  Path to image/transformation database that should be updated with the newly created image. **\[Default: NONE\]**

## AUTHORS

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

## LICENSE

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

## BUGS

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

## 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.