Content-type: text/html Manpage of sigest

sigest

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NAME

sigest - Estimate the rms level in an image.  

PERSON RESPONSIBLE

rjs  

CATEGORIES

map analysis  

DESCRIPTION

SIGEST is a Miriad task which attempts to estimate the rms noise level in an image. It does this by determining statistics of a clipped version of the image data. Based on the statistics of clipped Gaussian noise, the rms is then estimated. This assumes that the image pixels, after clipping, are dominated by noise.

SIGEST will work poorly on images containing significant sidelobes.  

PARAMETERS

in
The input image dataset. No default.
clip
The clip level to use. Pixels are excluded from the calculation if their absolute value is greater than the clip value. Ideally the clip should be about 2 to 3 times the rms noise level. The default uses an initial estimate of the rms to set the clip at 2.5 times the rms.
region
The standard image region of interest of the input. See the help on "region" for more information. The default is the entire image.


 

Index

NAME
PERSON RESPONSIBLE
CATEGORIES
DESCRIPTION
PARAMETERS

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Time: 18:35:38 GMT, July 05, 2011