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

# cmtk-filter(1)

Filter a volume image

## NAME

filter - Filter a volume image

## SYNOPSIS

filter \[options\] input output filter \[options\] \[-s,--studholme\] input output average subject img0 \[img1...\] filter \[options\] \[-R,--rohlfing\] input output subject

## DESCRIPTION

This tool applies spatial filtering operators, including cnotent-sensitive opersators, based on selective Gaussian kernels.

## 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.

- **--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

- **--gaussian** *\<float\>*, **-g** *\<float\>*

  Gaussian filter width (sigma) **\[Default: disabled\]**

- **--radius** *\<float\>*, **-r** *\<float\>*

  Filter radius (truncated outside) **\[Default: 2\]**

- **--mask** *\<string\>*, **-m** *\<string\>*

  Binary mask file name **\[Default: NONE\]**

- **--studholme**, **-s**

  Use Studholme's consistent filtering

- **--bin-width** *\<float\>*, **-b** *\<float\>*

  Intensity bin width for consistent filtering **\[Default: 10\]**

- **--rohlfing**, **-R**

  Use Rohlfing's single-image consistent filtering

- **--intensity-gaussian** *\<float\>*, **-G** *\<float\>*

  Intensity gaussian sigma for consistent filtering **\[Default: 0\]**

### 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.