Help for DLR12TO8
dlr12to8 is a program to compute a LUT-table for the point by point
intensity value transformation of a 12 Bit to an 8 Bit image.
This ASCII LUT file is suitable for input to the program flcform_lut.
Four transformation functions are given.
- Normalisation: gmean, gsig
- Equalisation
- Linear dnmin, dnmax or
- Linear (clipping) lower, upper (bound, percentage of all
pixels [e.g: 0.1,0.1%])
- SQRT (clipping) lower, upper (bound, percentage of all
pixels [e.g: 0.1,0.1%])
- pow (clipping) lower, upper (bound, percentage of all
pixels [e.g: 0.1,0.1%])
EXECUTION:
dlr12to8 histo-inp-file lut-out-file
+ Program reads the DNMIN DNMAX value in the
histo-inp-file history label and performs
a linear scaling.
dlr12to8 lut-out-file dnmin=xx dnmax=yy
+ Program use the DNMIN, DNMAX parameter and
performs a linear scaling (hwcform mode).
No histogram file is needed.
dlr12to8 histo-inp-file lut-out-file lower=xx upper=yy
+ Program calculates linear scaling factors.
xx percent of the lower and yy percent of
the upper pixel values will be ignored.
dlr12to8 histo-inp-file lut-out-file mode=equal
+ Program calculates LUT-table values for an
equalized output image.
dlr12to8 histo-inp-file lut-out-file mode=normal gmean=xx gsig=yy
+ Program calculates LUT-table values for an
normalized output image.
RESTRICTIONS:
If there are no histogramm files the mode ist the linear
transformation mode with given dnmin and dnmax values.
PARAMETERS:
INP
Input histogram files
OUT
output lut table file.
MODE
transformation mode
GMEAN
mean value of the
normalized image
GSIG
standart deviation
normalized image
DNMIN
Minimum value to be used
for the calculation of
the scaling factor
DNMAX
Maximum value to be used
for the calculation of
the scaling factor
LOWER
percentage of the lower
pixel values which will be
ignored for the calculation
of the scaling factor
UPPER
percentage of the upper
pixel values which will be
ignored for the calculation
of the scaling factor
MISSVAL
value will not be used
for histogram calculation