I. Introduction
Multispectral images acquire not only the spatial but also the spectral information of objects. The pixel values of the multispectral images describe the spectral characteristics of the object in each band. Compared with traditional RGB images, it can provide richer image information, and better reflect various optical characteristics of the image. Its application has gradually expanded from the initial remote sensing [1], [2], [3] to the fields of agriculture [4], biomedicine [5], high-performance color reproduction [6], [7], [8], and so on.