comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » filtering problem

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: filtering problem [message #22621 is a reply to message #22539]

Tue, 21 November 2000 00:00

Jaco van Gorkom
Messages: 97
Registered: November 2000

Member

"Dave Brennan" <9147261b@clinmed.gla.ac.uk> wrote in message
news:3A1A445B.14A912A3@clinmed.gla.ac.uk...
...
> Although any value below the thershold should not be included in the
> statistics, pixels below the threshold should be corrected by the
algorithm.
>
> Therefore is it possible to change the code:
>
> pro thresh, a, n, t
> m = a ge t
> wh = where(m,cnt)
> if cnt eq 0 then return
> a[wh] = a[wh] * mean(a[wh]) * (smooth(float(m),n,/EDGE) / $
> (smooth(a*m,n,/EDGE)+1.e-30))[wh]
> end
>
> to allow this.

If I understand you correctly, you want to correct the below-threshold
pixels by the factor calculated from the valid pixels surrounding it.
Couln't you just leave out some of the specific subscripting [wh] in the
final assignment?
a = a * mean(a[wh]) * (smooth(float(m),n,/EDGE) / $
(smooth(a*m,n,/EDGE)+1.e-30))
Correct me if I'm wrong here...

Jaco

----------------
Jaco van Gorkom e-mail: gorkom@rijnh.nl
FOM-Instituut voor Plasmafysica "Rijnhuizen", The Netherlands

Report message to a moderator

[Message index]

		filtering problem By: Dave Brennan on Thu, 16 November 2000 00:00
		Re: filtering problem By: John-David T. Smith on Tue, 21 November 2000 00:00
		Re: filtering problem By: Dave Brennan on Tue, 21 November 2000 00:00
		Re: filtering problem By: Jaco van Gorkom on Tue, 21 November 2000 00:00
		Re: filtering problem By: Dave Brennan on Tue, 21 November 2000 00:00

Previous Topic:	Spline Fitting and FWHM
Next Topic:	Getting BIG structures into IDL via CALL_EXTERNAL

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 09:41:21 PDT 2025

Total time taken to generate the page: 1.27984 seconds