<div dir="ltr">Was there suppose to be an attachment?</div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 29, 2015 at 1:33 PM, Leon Golub <span dir="ltr"><<a href="mailto:lgolub@cfa.harvard.edu" target="_blank">lgolub@cfa.harvard.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Here's a copy of the Oktem et al. paper.<br>
<br>
Leon<br>
<br>
<br>
On 06/29/2015 01:26 PM, Klimchuk, James A. (GSFC-6710) wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Thanks, Charles. Another paper on this general subject that deals with spectral imaging (overlap-ograms) was recently published by Figen Oktem (Oktem et al. 2014, IEEE Trans. on Image Processing, vol. 23, no. 12, p. 5707). Unfortunately, it doesn't seem to be available on ADS.<br>
<br>
Cheers,<br>
Jim<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
-----Original Message-----<br>
From: Charles C. Kankelborg [mailto:<a href="mailto:kankel@solar.physics.montana.edu" target="_blank">kankel@solar.physics.montana.edu</a>]<br>
Sent: Monday, June 29, 2015 12:39 PM<br>
To: Klimchuk, James A. (GSFC-6710)<br>
Cc: (<a href="mailto:Loops@solar.physics.montana.edu" target="_blank">Loops@solar.physics.montana.edu</a>)<br>
Subject: Re: [Loops] new spectroscopic analysis tool<br>
<br>
Hi Jim,<br>
<br>
This is a needed improvement. This kind of interpolation has been available for some<br>
time, but I have not see in applied to spectra (where it is probably most needed, for<br>
all the reasons you point out). Sakurai and Shin derived analytically, in closed form,<br>
a spline interpolation with rigorous photon conservation:<br>
<br>
Takashi Sakurai and Junho Shin, 2001<br>
"Interpolation of One- and Two-Dimensional Images with Pixelwise Photon Number<br>
Conservation "<br>
<a href="http://pasj.oxfordjournals.org/content/53/2/361.full" rel="noreferrer" target="_blank">http://pasj.oxfordjournals.org/content/53/2/361.full</a><br>
<br>
With our usual detectors (rear-illuminated CCDs) there can be significant charge<br>
spreading in the field free region, so the pixels are well defined (in effect, they are<br>
fuzzy and overlapping). A proper flux-conserving interpolation scheme should take<br>
that into account. To my knowledge, that has not been done.<br>
<br>
Best regards,<br>
Charles<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 2015 Jun 29, , at 6:59 AM, Klimchuk, James A. (GSFC-6710)<br>
</blockquote>
<<a href="mailto:james.a.klimchuk@nasa.gov" target="_blank">james.a.klimchuk@nasa.gov</a>> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Hi everyone,<br>
<br>
<br>
<br>
You might be interested in a new tool that Spiros, Durgesh, and I have<br>
</blockquote>
developed for analyzing spectra. It can be downloaded<br>
fromhttp://<a href="http://lanl.arxiv.org/abs/1506.08102" rel="noreferrer" target="_blank">lanl.arxiv.org/abs/1506.08102</a>. The abstract is below.<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
<br>
<br>
Hope to see many of you at Loops VII,<br>
<br>
Jim<br>
<br>
<br>
<br>
The detailed shapes of spectral line profiles provide valuable information about the<br>
</blockquote>
emitting plasma, especially when the plasma contains an unresolvedline blends is<br>
another. We have developed an iterative procedure called Intensity Conserving<br>
Spline Interpolation (ICSI) that corrects for this effect. As its name implies, it<br>
conserves the observed intensity within each wavelength bin, which ordinary fits do<br>
not. Given the rapid convergence, speed of computation, and ease of use, we<br>
suggest that ICSI be made a standard component of the processing pipeline for<br>
spectroscopic data.<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
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<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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-- <br>
______________________________________________________________________________<br>
Leon Golub, Senior Astrophysicist<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr">Edward DeLuca<div>Senior Scientist</div><div>Harvard-Smithsonian Center for Astrophysics</div><div>617-496-7725</div></div></div>
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