Science Diliman, Vol 16, No 2 (2004)

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SVD vs PCA: Comparison of Performance in an Imaging Spectrometer

Wilma Oblefias, Maricor Soriano, Caesar Saloma

Abstract


The calculation of basis spectra from a spectral library is an important prerequisite of any compact imaging spectrometer. In this paper, we compare the basis spectra computed by singular-value decomposition (SVD) and principal component analysis (PCA) in terms of estimation performance with respect to resolution, presence of noise, intensity variation, and quantization error. Results show that SVD is robust in intensity variation while PCA is not. However, PCA performs better with signals of low signal-to-noise ratio. No significant difference is seen between SVD and PCA in terms of resolution and quantization error.

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