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NRAO Home > CASA > CASA Task Reference Manual |
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0.1.19 deconvolve
Requires:
Synopsis
Image based deconvolver
Description
Several algorithms are available to deconvolve an image with a known psf
(dirty beam), or a Gaussian beam. The algorithms available are clark and
hogbom clean, a multiscale clean and a mem clean.
NOTE: Recommend using taskname=clean if psf is a dirty beam
Arguments
Inputs |
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imagename |
| Input image to deconvolve
| |
| allowed: | string |
|
| Default: |
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model |
| Output image containing deconvolved point model
| |
| allowed: | string |
|
| Default: |
|
|
psf |
| Point spread function (dirty beam)
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| allowed: | stringArray |
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| Default: |
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alg |
| Algorithm to use (clark, hogbom, multiscale, mem)
| |
| allowed: | string |
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| Default: | clark | |
niter |
| number of iteration in deconvolution process
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| allowed: | int | |
| Default: | 10 |
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gain |
| CLEAN gain parameter
| |
| allowed: | double | |
| Default: | 0.1 |
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threshold | mJy | level below which sources will not be deconvolved
| |
| allowed: | doublemJy |
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| Default: | 0.0 |
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mask |
| image mask to limit region of deconvolution
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| allowed: | string |
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| Default: |
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scales |
| scale sizes (pixels) to deconvolve
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| allowed: | intArray |
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| Default: | 0310
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sigma | mJy | mem parameter: Expected noise in image
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| allowed: | doublemJy |
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| Default: | 0.0 |
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targetflux | Jy | mem parameter: Estimated total flux in image
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| allowed: | doubleJy |
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| Default: | 1.0 |
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prior |
| mem parameter: prior image for mem search
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| allowed: | string |
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| Default: |
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void
Example
Several algorithms are available to deconvolve an image with a
known psf (dirty beam), or a Gaussian beam. The algorithms
available are clark and hogbom clean, a multiscale clean and a
mem clean. For more deconvolution control, use clean.
Keyword arguments:
imagename -- Name of input image to be deconvolved
model -- Name of output image containing the clean components
psf -- Name of psf image (dirty beam) to use
example: psf=’casaxmlf.image’ .
If the psf has 3 parameter, then a Gaussian
psf is assumed with the values representing
the major , minor and position angle values
e.g psf=[’3arcsec’, ’2.5arcsec’, ’10deg’]
alg -- algorithm to use: default = ’clark’
options: clark, hogbom, multiscale or mem.
niter -- Maximum number of iterations
gain -- CLEAN gain parameter; fraction to remove from peak
threshold -- Halt deconvolution if the maximum residual image is
below this threshold.
default = ’0.0Jy’
mask -- mask image (same shape as image and psf) to limit region
where deconvoltion is to occur
------parameters useful for multiscale only
scales -- in pixel numbers; the size of component to deconvolve.
default value [0,3,10]
recommended sizes are 0 (point), 3 (points per clean beam), and
10 (about a factor of three lower resolution)
------parameters useful for mem only
sigma -- Estimated noise for image
targetflux -- Target total flux in image
prior -- Prior image to guide mem
More information about CASA may be found at the
CASA web page
Copyright © 2016 Associated Universities Inc., Washington, D.C.
This code is available under the terms of the GNU General Public Lincense
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