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dcmmklut

NAME

dcmmklut - Create DICOM look-up tables

SYNOPSIS

 
 dcmmklut [options] dcmimg-out
 

DESCRIPTION

The dcmmklut utility allows to create a variety of DICOM Modality, Presentation and VOI look-up tables (LUT) and is intended for the creation of test images. The utility is able to read an existing DICOM image file, create a look up table according to the command line options, and write the new object back to file. It is also possible to create a new object containing the specified LUT without reading an existing DICOM image file. This is e.g. useful to simply store different look-up tables in a DICOM-like structure. As a default the output file is encoded with the same transfer syntax used for the input file, but the transfer syntax can also be specified as a command line option.

The LUT data can be derived from the shape of a gamma curve (default for the gamma factor is 1) or imported from a file (currently the MAP format from Ulead's PhotoImpact and a simple text format are supported). The input and output width of the LUT can also be specified in the range allowed by the DICOM standard. The interpolation of the input range is done by a polynomial curve fitting algorithm.

In addition to the DICOM output file the LUT data can also be exported to a tabbed text file which allows the easy visualization of the curves with a common spread sheet application (e.g. Microsoft Excel).

PARAMETERS

 
 dcmimg-out  DICOM output filename
 

OPTIONS

general options

 
   -h   --help
          print this help text and exit
 
        --version
          print version information and exit
 
   -v   --verbose
          verbose mode, print processing details
 
   -d   --debug
          debug mode, print debug information
 

LUT creation options

 
 LUT type:
 
   +Tm  --modality
          create as Modality LUT
 
   +Tp  --presentation
          create as Presentation LUT
 
   +Tv  --voi
          create as VOI LUT (default)
 
 LUT placement:
 
   +Pa  --add
          add to existing transform (defaul for and only with +Tv)
 
   +Pr  --replace
          replace existing transform (default for +Tm and +Tp)
 
 LUT content:
 
   +Cg  --gamma  [g]amma : float
          use gamma value (default: 1.0)
 
   +Cm  --map-file  [f]ilename : string
          read input data from MAP file
 
   +Ct  --text-file  [f]ilename : string
          read input data from text file
 
 LUT options:
 
   +Og  --inverse-gsdf
          apply inverse GSDF (print presentation LUT in OD)
 
        --min-density  [v]alue : integer (0..65535, default: 20)
          set min density to v (in hundreds of OD)
 
        --max-density  [v]alue : integer (0..65535, default: 300)
          set max density to v (in hundreds of OD)
 
   +Oi  --illumination  [v]alue : integer (0..65535, default: 2000)
          set illumination to v (in cd/m^2)
 
   +Or  --reflection  [v]alue : integer (0..65535, default: 10)
          set reflected ambient light to v (in cd/m^2)
 
 LUT structure:
 
   -b   --bits  [n]umber : integer
          create LUT with n bit values (8..16, default: 16)
 
   -e   --entries  [n]umber : integer
          create LUT with n entries (1..65536, default: 256)
 
   -f   --first-mapped  [n]umber : integer
          first input value mapped (-31768..65535, default: 0)
 
   -r   --random  [n]umber : unsigned integer
          perform n randomly selected permutations on the LUT
 
   -rs  --random-seed  [n]umber : unsigned integer
          initialise the random-number generator with n
          (default: 0, for reproduceable results)
 
   -o   --order  [n]umber : integer
          use polynomial curve fitting algorithm with order n
          (0..99, default: 5)
 
   -E   --explanation  [n]ame : string
          LUT explanation (default: automatically created)
 
   -a   --byte-align
          create byte-aligned LUT (implies -b 8)
 
 LUT data VR:
 
   +Dw  --data-ow
          write LUT Data as OW (default)
 
   +Du  --data-us
          write LUT Data as US
 
   +Ds  --data-ss
          write LUT Data as SS (minimal support)
 

file options

 
 
   +Fi  --dicom-input  [f]ilename : string
          read dataset from DICOM file f
 
   +Fo  --text-output  [f]ilename : string
          write LUT data to tabbed text file f
 

COMMAND LINE

All command line tools use the following notation for parameters: square brackets enclose optional values (0-1), three trailing dots indicate that multiple values are allowed (1-n), a combination of both means 0 to n values.

Command line options are distinguished from parameters by a leading '+' or '-' sign, respectively. Usually, order and position of command line options are arbitrary (i.e. they can appear anywhere). However, if options are mutually exclusive the rightmost appearance is used. This behaviour conforms to the standard evaluation rules of common Unix shells.

In addition, one or more command files can be specified using an '@' sign as a prefix to the filename (e.g. @command.txt). Such a command argument is replaced by the content of the corresponding text file (multiple whitespaces are treated as a single separator) prior to any further evaluation. Please note that a command file cannot contain another command file. This simple but effective approach allows to summarize common combinations of options/parameters and avoids longish and confusing command lines (an example is provided in file share/data/dumppat.txt).

ENVIRONMENT

The dcmmklut utility will attempt to load DICOM data dictionaries specified in the DCMDICTPATH environment variable. By default, i.e. if the DCMDICTPATH environment variable is not set, the file <PREFIX>/lib/dicom.dic will be loaded unless the dictionary is built into the application (default for Windows).

The default behaviour should be preferred and the DCMDICTPATH environment variable only used when alternative data dictionaries are required. The DCMDICTPATH environment variable has the same format as the Unix shell PATH variable in that a colon (':') separates entries. The data dictionary code will attempt to load each file specified in the DCMDICTPATH environment variable. It is an error if no data dictionary can be loaded.

COPYRIGHT

Copyright (C) 1998-2004 by Kuratorium OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.