Modified Polynomial Fitting (ModPoly)

Table of contents

1. Introduction
2. How to use
3. Behavior
4. Method
5. References

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Introduction

Modified Polynomial Fitting (ModPoly) estimates a spectral baseline with a polynomial curve and subtracts it from selected spectra.

How to use

To use ModPoly for baseline removal:

1. Upload data and select the spectra you want to process.
2. Navigate to the sidebar and turn on the Baseline removal toggle.
3. Select “ModPoly” from the drop-down menu.
4. Configure parameters:
   • Set polynomial degree (defaults to 5) - determines the degree of the polynomial fit used for basline correction.

Behavior

ModPoly fits a polynomial function to estimate and subtract the baseline from the spectra.

A polynomial function with degree specified by the user is iteratively fitted to the data until it either stops making sufficient progress each iteration or reaches the maximum number of iterations. This polynomial is treated as the baseline and subtracted from the original data.

Method

ModPoly estimates the baseline as a polynomial of user-selected degree:

\[b(x)=\sum_{k=0}^{d} a_k x^k\]

Parameter	Tunable or fixed	Implementation
ModPoly Polynomial degree	Tunable	Default 5, UI range 1-20
Baseline action	Fixed	Fitted baseline is subtracted from each selected spectrum

References

1. Lieber, C. A., & Mahadevan-Jansen, A. (2003). Automated method for subtraction of fluorescence from biological Raman spectra. Applied Spectroscopy, 57(11), 1363-1367. https://doi.org/10.1366/000370203322554518

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