Manpage of vblank
Section: User Commands (1)
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vblank - Mask outlier pixels on the spectral axis
VBLANK takes a cube that has already been masked and masks it
further so that unmasked pixels that are surrounded by only
masked pixels along axis 1 will be masked. The default is to
mask if both adjacent pixels are masked; one can increase the
window size with keyword 'tol'.
This can be useful for reducing noise in a datacube that has
already been masked with a smoothed cube and where the velocity
field is assumed to be smooth. In this case axis 1 would be the
velocity axis and spikes far from the channels of actual
emission are masked.
NOTE: Because flagging is only implemented for planes, the
spectral axis must be axis 1. Use REORDER first to make this
reorder in=file1 out=file2 mode='312'
reorder in=file2 out=file3 mode='231'
This is the standard name for an input dataset -- usually
an image, though sometimes either an image or visibility dataset
or some foreign dataset format. Some tasks support multiple
input datasets at a time (with wildcard supported) whereas
others can handle only a single one at a time. There is
generally no default input name.
How far (in pixels) the nearest unmasked pixel can be for the
given pixel to stay unmasked. Default is 1.
lank.for,v 1.2 2011/06/01 04:58:16 pteuben Exp $
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Time: 18:35:39 GMT, July 05, 2011