Application-Dedicated Selection of Filters (ADSF) using covariance maximization and orthogonal projection

Hadoux, X, Kumar, D, Sarossy, M, Rogers, J and Gorretta, N 2016, 'Application-Dedicated Selection of Filters (ADSF) using covariance maximization and orthogonal projection', Analytica Chimica Acta, vol. 921, pp. 1-12.

Document type: Journal Article
Collection: Journal Articles

Title Application-Dedicated Selection of Filters (ADSF) using covariance maximization and orthogonal projection
Author(s) Hadoux, X
Kumar, D
Sarossy, M
Rogers, J
Gorretta, N
Year 2016
Journal name Analytica Chimica Acta
Volume number 921
Start page 1
End page 12
Total pages 12
Publisher Elsevier
Abstract Visible and near-infrared (Vis-NIR) spectra are generated by the combination of numerous low resolution features. Spectral variables are thus highly correlated, which can cause problems for selecting the most appropriate ones for a given application. Some decomposition bases such as Fourier or wavelet generally help highlighting spectral features that are important, but are by nature constraint to have both positive and negative components. Thus, in addition to complicating the selected features interpretability, it impedes their use for application-dedicated sensors. In this paper we have proposed a new method for feature selection: Application-Dedicated Selection of Filters (ADSF). This method relaxes the shape constraint by enabling the selection of any type of user defined custom features. By considering only relevant features, based on the underlying nature of the data, high regularization of the final model can be obtained, even in the small sample size context often encountered in spectroscopic applications. For larger scale deployment of application-dedicated sensors, these predefined feature constraints can lead to application specific optical filters, e.g., lowpass, highpass, bandpass or bandstop filters with positive only coefficients. In a similar fashion to Partial Least Squares, ADSF successively selects features using covariance maximization and deflates their influences using orthogonal projection in order to optimally tune the selection to the data with limited redundancy. ADSF is well suited for spectroscopic data as it can deal with large numbers of highly correlated variables in supervised learning, even with many correlated responses.
Subject Signal Processing
Keyword(s) Dimension reduction
Feature selection
Filter selection
Optical filters
Orthogonal projection
Variable selection
DOI - identifier 10.1016/j.aca.2016.04.004
Copyright notice © 2016 Elsevier
ISSN 0003-2670
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