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Re: interpolate over bad pixels [message #44642 is a reply to message #44561]

Wed, 29 June 2005 03:06

Jess
Messages: 11
Registered: June 2005

Junior Member

Hi again Em,

This is what I'm now doing for the 1D arrays which works really well.
I'm sure its not the fastest, but it works fine. Below I've given the
syntax for a 2D example (sorry if its not quite right, as I haven't
tested this 2D one).

Create 3 arrays, one that contains just the indices of the good pixels,
second that contains just the values of the good pixels, and third that
contains the indices of all the pixels, eg.

; where not eq NAN
wh_good = WHERE(FINITE(orig_image))
; image with just good pixels
image_good = orig_image(wh_good)

; size of image
dimens = size(orig_image,/dimensions)
xnum = dimens[0]
ynum = dimens[1]
; indices of all pixels
wh_all = indgen(xnum,ynum)

; Then interpolate, to get corrected image
; eg. linear interpolation
image_corr = interpol(image_good,wh_good,wh_all)
; or for cubic spline
image_corr = interpol(image_good,wh_good,wh_all,/spline)

Have a look at the help on where, finite and interpol.

Cheers,
Jess

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[Message index]

		interpolate over bad pixels By: Em on Mon, 27 June 2005 15:22
		Re: interpolate over bad pixels By: Jess on Wed, 29 June 2005 03:06
		Re: interpolate over bad pixels By: Jess on Tue, 28 June 2005 19:56

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