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Local rank analysis for exploratory spectroscopic image analysis. Fixed Size Image Window-Evolving Factor Analysis

AuthorsJuan, Anna de; Maeder, Marcel; Hancewicz, Thomas; Tauler, Romà
KeywordsExploratory spectroscopic image analysis
Fixed Size Image Window-Evolving Factor Analysis
Evolving Factor Analysis
Singular Value Decomposition
Parallel Coordinate System
Issue Date13-Apr-2005
CitationChemometrics and Intelligent Laboratory Systems 77(1-2): 64-74 (2005)
AbstractMany pharmaceutical and consumer products are composed of emulsion-based formulations that act as delivery systems for active ingredients or other benefit agents. The efficacy and performance of these products often rely on how the actives interact and are stabilized by the base emulsion formulation. It is therefore of great significance to the development and processing of these formulations to be able to accurately characterize the structure and chemical distribution of components in these systems. Recent advances in spectroscopic imaging technology have played an important role in bringing these methods into acceptance and perhaps even prominence in both the consumer product and pharmaceutical industries as standard methods of analyzing these kinds of chemical systems. Concurrently, this has kindled the interest in methodology capable of analyzing the large data sets generated by these multivariate imaging experiments.
Efficient exploratory analysis of spectroscopic images is therefore crucial, the desired goal being to resolve the chemical information in the data into its pure component parts. An approximate description of the compositional complexity of images is not yet available through the usual exploratory procedures.
Methods used for this purpose should be local and be able to take into account the complex spatial structure of the image. Fixed Size Moving Window-Evolving Factor Analysis has been a powerful approach to locally define the complexity of a process through the subsequent PCA analyses of data subsets built by moving a fixed size window along a unique process direction (e.g., time, pH). Spectroscopic images have two or three spatial directions (in surface or multilayer images, respectively). Algorithms based on local data analysis should be adapted to preserve this higher dimensionality in order to provide a representative description of the image complexity. Fixed Size Image Window-Evolving Factor Analysis (FSIW-EFA) modifies the parent local rank algorithm to achieve this purpose.
Description11 pages, 8 figures.-- Printed version published May 28, 2005.-- Issue title: "Festschrift honouring professor D.L. Massart" (Edited by P. Hopke and C. Spiegelman).
Publisher version (URL)http://dx.doi.org/10.1016/j.chemolab.2004.11.006
Appears in Collections:(IDAEA) Artículos
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