NAME

lowpars -- Set low-pass filter parameters for the wiener task.

USAGE

lowpars

DESCRIPTION

This pset is used to set the values for the low-pass filter parameters in the wiener task.

After deconvolving the input image, the wiener task may optionally apply a low-pass filter to the deconvolution result. This low-pass filtering step is particularly important in the case of inverse filter deconvolution. Use parameter lowpass to specify filter type, and fwhm parameter to specify the width of the smoothing kernel in image pixel units. A circularly symmetric or an axially symmetric (in frequency domain) filter can be selected, or you can specify that no filter is to be used at all. The square filter has proven to be effective at eliminating rings around the deconvolved point sources. The filter is an apodizing function which minimizes side-bands.

PARAMETERS

(lowpass = "none") [string, allowed values: none | square | circular]

Type of low-pass filter.

(fwhm = INDEF) [real, min=1.]

Full width at half maximum of low-pass filter smoothing kernel, in image pixel units. If INDEF, no filtering is performed regardless of lowpass value.

EXAMPLES

BUGS

SEE ALSO

Type "help wiener" and "help wiener opt=sys" for more information about the wiener task.