Glossary: Spectral coding. English: spectral encoding. Explanation: describe the spectral characteristics in the form of coding for quantitative analysis and identification of spectra. In recognition, the coding vector of the measured spectrum is compared with the coding vector of the reference image, and its matching coefficient is calculated. The size of the matching coefficient is taken as their similarity measure. The coding technology compresses the amount of data, improves the processing efficiency, and maintains the important morphological characteristics of the spectrum. Common methods include: ① spectral binary coding; ② Multi threshold coding; ③ Spectral absorption feature coding.
