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ccdblob - properties of a blob in an image
ccdblob [parameter=value]
ccdblob is a poor man’s source extractor and computes some properties
of a blob ("star") in an image. With given rough pixel coordinates and a
box size, it will determine the peak, shape and flux of the blob, assuming
the background signal (box needs to be big enough for this) is well characterised
by the median value. This current algorithm thus does not work in crowded
fields.
The current draft version is based off ccdshape(1NEMO)
and thus
inherits some keywords and output that may disappear or change meaning.
Pixel coordinates are 1-based.
The following parameters are recognized
in any order if the keyword is also given:
- in=
- Input NEMO image file [???]
- pos=
- (x,y) position, or use max in map. Integers, and are 1-based. []
- box=
- Box size to use around pos [32]
- clip=
- Use only values above clip
[]
- wcs=
- Use WCS of the cube (else use pixel coordinates)
- radecvel=
- Split
the RA/DEC from VEL [f]
- weight=
- Weights by intensity [t]
- cross=
- Use
cross correlations between X and Y to
Analysing some Betelgeuse
images from an all-sky camera:
% fitsccd ASC/MASN-01/archive/201601/20160102/IMG00700.FIT - | ccdblob - 724,305
BLOB 726 305 724.573 305.38 32 6546 42731 139121
Where the BLOB line lists the peak position (pixels are 1-based), followed
by an intensity weighted position, the box size around the estimated center,
followed by the median, peak and total blob flux (corrected for the median
background).
ccdstat(1NEMO)
, image(5NEMO)
src/image/misc/ccdblob.c
Peter Teuben
15-feb-2020 V0.1 Created PJT
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