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Re: scatter light correction [message #87136 is a reply to message #87125]

Thu, 09 January 2014 07:28

Mats Löfdahl
Messages: 263
Registered: January 2012

Senior Member

Den torsdagen den 9:e januari 2014 kl. 06:46:55 UTC+1 skrev sid:
> On Wednesday, January 8, 2014 6:09:41 PM UTC+5:30, David Fanning wrote:
>> sid writes:
>
>>> In my spectral data, there is some problem due to scatter light, the problem is even after flat correction, there is still some scatter light and this scatter light changes my result drastically. This is very urgent so please help me out to get rid of this scatter light from my spectral data. Please give me some ideas or some routines that performs this correction.
>
>> Median filter.
>
> In my data there is a change in intensity along the wavelength axis. And I have to correct for this change in intensity.

Scattered light (or stray light - the terms are sometimes used interchangeably and sometimes mean slightly different things) can in general not be removed unless you know something about its characteristics. Is it just an added constant level? Or is it a purely additive but wavelength dependent component? Or, even worse, does the stray light depend on the object? In astronomical imaging, one useful model is that the observed image consist of two components: the "real" image and a blurred version of the real image. The problem then boils down to estimating the blurring kernel. You mention "wavelength axis" so I assume you also have one (or two?) spatial dimension(s).

Anyway, do you have any calibration data that might provide such information?

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[Message index]

		scatter light correction By: gunvicsin11 on Tue, 07 January 2014 22:44
		Re: scatter light correction By: David Fanning on Wed, 08 January 2014 04:39
		Re: scatter light correction By: gunvicsin11 on Wed, 08 January 2014 21:46
		Re: scatter light correction By: David Fanning on Thu, 09 January 2014 06:04
		Re: scatter light correction By: Andy Sayer on Thu, 09 January 2014 06:33
		Re: scatter light correction By: Mats Löfdahl on Thu, 09 January 2014 07:28

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