dcmdjpeg

Langue: en

Version: 265384 (debian - 07/07/09)

Section: 1 (Commandes utilisateur)

NAME

dcmdjpeg - Decode JPEG-compressed DICOM file

SYNOPSIS

 
 dcmdjpeg [options] dcmfile-in dcmfile-out
 

DESCRIPTION

The dcmdjpeg utility reads a JPEG-compressed DICOM image (dicomfile-in), decompresses the JPEG data (i. e. conversion to a native DICOM transfer syntax) and writes the converted image to an output file (dicomfile-out).

PARAMETERS

 
 dcmfile-in   DICOM input filename to be converted
 
 dcmfile-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
 

input options

 
 input file format:
 
   +f    --read-file
           read file format or data set (default)
 
   +fo   --read-file-only
           read file format only
 
   -f    --read-dataset
           read data set without file meta information
 
   # This option allows to decompress JPEG compressed DICOM objects that have
   # been stored as dataset without meta-header. Such a thing should not exist
   # since the transfer syntax cannot be reliably determined without meta-header,
   # but unfortunately it does.
 

processing options

 
 color space conversion options:
 
   +cp   --conv-photometric
           convert if YCbCr photom. interpr. (default)
 
   # If the compressed image uses YBR_FULL or YBR_FULL_422 photometric
   # interpretation, convert to RGB during decompression.
 
   +cl   --conv-lossy
           convert YCbCr to RGB if lossy JPEG
 
   # If the compressed image is encoded in lossy JPEG, assume YCbCr
   # color model and convert to RGB.
 
   +ca   --conv-always
           always convert YCbCr to RGB
 
   # If the compressed image is a color image, assume YCbCr color model
   # and convert to RGB.
 
   +cn   --conv-never
           never convert color space
 
   # Never convert color space during decompression.
 
 planar configuration options:
 
   +pa   --planar-auto
           automatically determine planar configuration
           from SOP class and color space (default)
 
   # If the compressed image is a color image, store in color-by-plane
   # planar configuration if required by the SOP class and photometric
   # interpretation. Hardcopy Color images are always stored color-by-
   # plane, and the revised Ultrasound image objects are stored color-by-
   # plane if the color model is YBR_FULL.  Everything else is stored
   # color-by-pixel.
 
   +px   --color-by-pixel
           always store color-by-pixel
 
   # If the compressed image is a color image, store in color-by-pixel
   # planar configuration.
 
   +pl   --color-by-plane
           always store color-by-plane
 
   # If the compressed image is a color image, store in color-by-plane
   # planar configuration.
 
 SOP Instance UID options:
 
   +ud   --uid-default
           keep same SOP Instance UID (default)
 
   #  Never assigns a new SOP instance UID.
 
   +ua   --uid-always
           always assign new UID
 
   # Always assigns a new SOP instance UID
 

output options

 
 output file format:
 
   +F    --write-file
           write file format (default)
 
   -F    --write-dataset
           write data set without file meta information
 
 output transfer syntax:
 
   +te   --write-xfer-little
           write with explicit VR little endian (default)
 
   +tb   --write-xfer-big
           write with explicit VR big endian TS
 
   +ti   --write-xfer-implicit
           write with implicit VR little endian TS
 
 post-1993 value representations:
 
   +u    --enable-new-vr
           enable support for new VRs (UN/UT) (default)
 
   -u    --disable-new-vr
           disable support for new VRs, convert to OB
 
 group length encoding:
 
   +g=   --group-length-recalc
           recalculate group lengths if present (default)
 
   +g    --group-length-create
           always write with group length elements
 
   -g    --group-length-remove
           always write without group length elements
 
 length encoding in sequences and items:
 
   +e    --length-explicit
           write with explicit lengths (default)
 
   -e    --length-undefined
           write with undefined lengths
 
 data set trailing padding (not with --write-dataset):
 
   -p=   --padding-retain
           do not change padding (default if not --write-dataset)
 
   -p    --padding-off
           no padding (implicit if --write-dataset)
 
   +p    --padding-create  [f]ile-pad [i]tem-pad: integer
           align file on multiple of f bytes
           and items on multiple of i bytes
 

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 dcmdjpeg 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.

SEE ALSO

dcmcjpeg(1)

Copyright (C) 2001-2005 by Kuratorium OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.