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The CCD package includes possibilities, before doing the actual
calibration step(s), to correct for bad pixels in the CCD calibration
frames. This correction is applied via the command FIXPIX/CCD
and based on existing MODIFY commands. Except for the input and
output frame the FIXPIX/CCD command accepts two more parameters
in the command line: the correction method to be applied and the MIDAS
table containing the bad pixel(s) of bad pixel areas(s). Default value for
these two parameters are stored in the keywords FX_METH and
FX_FILE. In addition to these keywords three other keywords exist
to control the correction procedure: FX_FACT, FX_FPAR,
and FX_NOISE. The use of these keywords depends on the correction
method applied.
Currently, the required format of the table file depends on the correction
method to be applied. Below you can find a listing of the method available
and with FX_ keywords involved.
- method area (MIDAS commands MODIFY/AREA):
parameter degree taken from keyword FX_FPAR(1);
parameter constant=0.
- method pixel (MIDAS command MODIFY/PIX):
parameter arfacts taken from keyword FX_FACT;
parameter xdeg,ydeg,niter taken from keyword FX_FPAR;
parameter noise taken from keyword FX_NOISE.
- method column (MIDAS command MODIFY/COLUMN):
parameter col_type=V.
- method row (MIDAS command MODIFY/ROW):
parameter row_type=V.
Next: Mosaicing of Frames
Up: Additional Processing
Previous: Fringe correction
Petra Nass
1999-06-15