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ccdflipd - patch up neighbors that are +/- of each other within a delta
ccdflipd [parameter=value]
This peculiar program patches
an image where neighbors that sum to something close to 0 (see delta= below)
become proper positive neighors. It will iterate over the image until no
more patches are needed or until the requested number of iterations (iter=)
is exhausted.
In default mode each pixel looks at all 8 neighors and will
flip the sign of those neighbors if within range. By increasing m= you can
require a larger number of neighbors needed to flip them, favoring more
interconnected regions.
The following parameters are recognized
in any order if the keyword is also given:
- in=
- Input image file [???]
- out=
- Output image file [???]
- delta=
- Allowed delta between sum of
two neighboring pixels [20]
- iter=
- Number of iterations [50]
- m=
- Minimum
number of neighbors needed to path the pixel. The default of 1 is rather
aggressive, but yields reasonable results, but increasing this can make
the flipping more conservative. Default: 1
The origin of this peculiar
program is a double peak fit (see ccdmom(1NEMO)
) to a cube, where the two
peaks are not always in the same order. A difference map between peak1
and peak2 will then have alternating signs, and this program nicely patches
this up
ccdmom cube1 peak1 mom=31 peak=1
ccdmom cube1 peak2 mom=31 peak=2
ccdmath peak1,peak2 peak12 %1-%2
ccdflipd peak12 peak12a iter=20 delta=30
ccdmath(1NEMO)
, image(5NEMO)
src/image/trans/ccdflipd.c
Peter Teuben
14-Mar-22 V0.1 Created PJT
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