Research on Key Algorithms of Segmented Spectrum Retrieval System
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The quality of characteristic spectra stored in spectral database directly affects the matching calculation of retrieval algorithm. Spectral data is different from mass spectrometry. Mass spectrometry only needs to record the position and intensity of peaks. Spectral data is continuous. There are many useful information concentrated in fingerprint area. Usually, the dimension of spectral data is relatively high. At the beginning of the establishment of spectral database, the amount of data will be relatively small. Therefore, dimensionality reduction and feature extraction of spectral data are needed before building spectral database. The whole dimension reduction feature extraction method can retain less information about the region of interest. In order to solve this problem, this paper proposes a segmentation feature extraction algorithm. The classification verification experiment also proves that the segmentation method is better than the whole method. In addition, on the basis of feature extraction, a feature retrieval algorithm with piecewise weighting is implemented. The time and space complexities of the algorithm are related to the performance of spectral database. The larger the spectral database is, the slower the retrieval is, and the faster the retrieval is.
KeywordsSegmented spectrum retrieval Principal component analysis Dimension reduction
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