Spectral or peak alignment

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Curious Mind 2017-7-9

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回答： Kateryna Artyushkova 2018-10-19

Hello: I have two spectra, Spectrum A and Spectrum B. Spectrum A is the reference spectrum and spectrum B is one I just collected. I'm trying to match spectrum B with the reference spectrum A. However, I realized that the peaks in B are a bit shifted.

My question is how do I correctly align B to the reference A using matlab?

How do I correct for the peak shifts in my spectrum so that they align correctly to the reference spectrum using matlab or any other program or algorithm?

Thank you.

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dpb 2017-7-9

'Pends on what kind of shift you're talking about...is it simply a phase shift of the whole spectrum or a shrinkage/expansion?

Attach at least figure; data would be better...

Curious Mind 2017-7-9

I just attached a figure. Thank you.

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Kateryna Artyushkova 2018-10-19

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Maybe this will work: https://www.mathworks.com/matlabcentral/fileexchange/15392-shifts-set-of-spectra-to-a-new-maximum-position?s_tid=prof_contriblnk

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Star Strider 2017-7-9

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One option is to use the Signal Processing Toolbox alignsignals (link) function. That is not its intended use, but it could work. (It is relatively recent. The documentation does not say when it was introduced.)

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Curious Mind 2017-7-10

@Image Analyst:

I really appreciate the information. I think I'm gonna leave the data the way it is. Thank you so much.

Curious Mind 2017-7-10

@dpb Thank you.

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Image Analyst 2017-7-9

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Look up xcorr in the help and see this entry "Find a Signal in a Measurement". It says "You receive some data and would like to know if it matches a longer stream you have measured. Cross-correlation allows you to make that determination, even when the data are corrupted by noise."

and then it gives an example. Try it.