Was there suppose to be an attachment?

On Mon, Jun 29, 2015 at 1:33 PM, Leon Golub <lgolub@cfa.harvard.edu> wrote:
Here's a copy of the Oktem et al. paper.

Leon


On 06/29/2015 01:26 PM, Klimchuk, James A. (GSFC-6710) wrote:
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.

Cheers,
Jim

-----Original Message-----
From: Charles C. Kankelborg [mailto:kankel@solar.physics.montana.edu]
Sent: Monday, June 29, 2015 12:39 PM
To: Klimchuk, James A. (GSFC-6710)
Cc: (Loops@solar.physics.montana.edu)
Subject: Re: [Loops] new spectroscopic analysis tool

Hi Jim,

This is a needed improvement. This kind of interpolation has been available for some
time, but I have not see in applied to spectra (where it is probably most needed, for
all the reasons you point out). Sakurai and Shin derived analytically, in closed form,
a spline interpolation with rigorous photon conservation:

Takashi Sakurai and Junho Shin, 2001
"Interpolation of One- and Two-Dimensional Images with Pixelwise Photon Number
Conservation "
http://pasj.oxfordjournals.org/content/53/2/361.full

With our usual detectors (rear-illuminated CCDs) there can be significant charge
spreading in the field free region, so the pixels are well defined (in effect, they are
fuzzy and overlapping). A proper flux-conserving interpolation scheme should take
that into account. To my knowledge, that has not been done.

Best regards,
Charles


On 2015 Jun 29, , at 6:59 AM, Klimchuk, James A. (GSFC-6710)
<james.a.klimchuk@nasa.gov> wrote:

Hi everyone,



     You might be interested in a new tool that Spiros, Durgesh, and I have
developed for analyzing spectra. It can be downloaded
fromhttp://lanl.arxiv.org/abs/1506.08102.  The abstract is below.



Hope to see many of you at Loops VII,

Jim



The detailed shapes of spectral line profiles provide valuable information about the
emitting plasma, especially when the plasma contains an unresolvedline blends is
another. We have developed an iterative procedure called Intensity Conserving
Spline Interpolation (ICSI) that corrects for this effect. As its name implies, it
conserves the observed intensity within each wavelength bin, which ordinary fits do
not. Given the rapid convergence, speed of computation, and ease of use, we
suggest that ICSI be made a standard component of the processing pipeline for
spectroscopic data.





********************************************************************************

James A. Klimchuk

NASA Goddard Space Flight Center

Solar Physics Lab, Code 671

Bldg. 21, Rm. 158

Greenbelt, MD  20771

USA



Phone:  1-301-286-9060

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E-mail:  James.A.Klimchuk@nasa.gov

Homepage:
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okId=15844



No endorsement by NASA is implied for any correspondence related to my official
role in professional organizations.



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