Apparatus and methods of spectral searching that employ wavelet coefficients as the basis for the searching. The disclosed apparatus and methods employ a wavelet lifting scheme to transform spectroscopic data corresponding to an unknown pure material/mixture to vector of wavelet coefficients, compare the wavelet coefficient vector for the unknown pure material/mixture with library of wavelet coefficient vectors for known pure materials/mixtures, and identify the closest match to the unknown pure material/mixture based on the comparison of wavelet coefficient vectors. Because the wavelet lifting scheme can generate the wavelet coefficient vectors for the unknown pure material/mixture as well as the known pure materials/mixtures to conform to a desired compression level, the disclosed apparatus and methods can perform spectral searching with increased speed and reduced memory requirements, thereby making the disclosed apparatus and methods amenable for use in hand-held instruments for on-site material identification.
展开▼
