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vblank

Section: User Commands (1)
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NAME

vblank - Mask outlier pixels on the spectral axis  

PERSON RESPONSIBLE

thw  

CATEGORIES

image-analysis  

DESCRIPTION

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 so:

  reorder in=file1 out=file2 mode='312'
  vblank  in=file2
  reorder in=file2 out=file3 mode='231'
 

PARAMETERS

in
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.
tol
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 $


 

Index

NAME
PERSON RESPONSIBLE
CATEGORIES
DESCRIPTION
PARAMETERS

This document was created by man2html, using the manual pages.
Time: 18:35:39 GMT, July 05, 2011