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dconvlum - Convert VeriLUM files to DCMTK display files


dconvlum in-file out-file [ambient]


Command line program that converts VeriLUM file with characteristic curve data
(CCx_xx.dat) to a format used for the Barten transformation in this toolkit. VeriLUM is a
calibration package from ImageSmiths consisting of a photometer (with serial RS232
connector) and a Windows NT software.


in-file VeriLUM characteristic curve file to be converted

out-file DCMTK display file to be written

ambient ambient light (cd/m^2, floating point value)


The output file describing the characteristic curve of a display system (monitor) is a
simple text file. Lines starting with a '#' are treated as comments and therefore skipped
as well as blank lines. This conversion program creates such a file automatically
(including some comment lines) by transforming the information stored in the VeriLUM file.
The number following the magic word 'max' defines the maximum DDL value (e.g. 255 for 8
bit displays). This definition is required before the luminance data can be defined.
Optionally the ambient light value can be specified in this file too. The floating point
value (in candela per square meter) must follow the word 'amb'. Finally the luminance
values are defined for each corresponding DDL (digital driving level) value. The entries
do not necessarily have to be ordered or complete, i.e. there can be less than 'max' + 1
entries. Missing values are calculated by cubic spline interpolation.

See DICOM standard part 14 for more details on display calibration and Barten's model
(including GSDF).

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