Space-spectrum mutual injection image fusion method and system and readable storage medium

The invention discloses a space-spectrum mutual injection image fusion method and system and a readable storage medium. The method comprises the following steps: inputting a panchromatic wave band and a multispectral wave band of a remote sensing image; the method comprises the following steps: registering a multispectral image and a panchromatic image, re-sampling each image wave band, constructing an intermediate wave band by using the multispectral image, packaging a fusion object, and counting a mean value, a mean square error and a correlation coefficient matrix of each image wave band participating in fusion; respectively selecting a fusion target wave band and a fusion source wave band in the panchromatic wave band image and the multispectral wave band image, and carrying out fusion calculation of a mean filtering image on each wave band of the multispectral image; and calculating a mean value and a mean square error of a mean filtering image fusion result, and carrying out histogram matching on the me