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Name

ccdblob - properties of a blob in an image

Synopsis

ccdblob [parameter=value]

Description

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.

Parameters

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

Examples

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).

See Also

ccdstat(1NEMO) , image(5NEMO)

Files

src/image/misc/ccdblob.c

Author

Peter Teuben

Update History


15-feb-2020    V0.1 Created    PJT


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