HTML automatically generated with rman
Table of Contents
ccddiffract - smoothing/diffracting an image
ccddiffract in=image
out=image [parameter=value]
ccddiffract will smooth and/or add
diffraction patterns an image to make it look "pretty". It can also add
some quasi poissonian noise.
In the current version a fraction of light
is kept in the main gaussian beam, whereas another fraction is dispersed
in the diffraction spikes.
The following parameters are recognized
in any order if the keyword is also given:
- in=in-file
- input file, in Image(5)
format [no default]
- out=out-file
- output file, will be in Image(5)
format
[no default]
- gauss=value
- Beam size (FWHM, note FWHM = 2*sqrt(2*ln(2)
) =
2.355 * sigma) of a gaussian smoothing kernel. ignored [default: 0.05].
- fraction=
- Fraction of signal that is diffracted. The remainder is smoothed using a
gaussian beam. [default: 0.1].
- cutoff=
- Signal below which no diffraction spikes
are added.
- spike=
- The width of the spike. For the spike, a sqr(sinc(x)) is
used, where the width is the distance to the first null. No signal beyond
the first null is added. [default: 0.1].
- noise=
- Amount of noise. [default:
0].
- bad=bad_value
- Input pixel value which to skip in smoothing. [Default:
not used]
Should look at the code in STARLAB/src/star/rdc/make_ccd.C
ccdsmooth(1NEMO)
, ccdfill(1NEMO)
, snapccd(1NEMO)
, snapgrid(1NEMO)
,
image(5NEMO)
Peter Teuben
src/image/trans ccddiffract.c
9-may-01 V0.1: Created from CCDSMOOTH PJT
Table of Contents