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The kernel matched filter (KMF) is defined in Kwon & Nasrabadi (2007).
Briefly, Given kernel function and target/background matrix, the KMFresponse is given by:
The inverse$\hat{K}^{-2}$ may not be numerically stable if the background spectral samples are not independent.
Therefore, the pseudo-inverse of K is used, which is based on eigenvalue decomposition,
where eigenvectors with eigenvalues larger than
eigval_min
are used.