Atomic number image processing method in security check

The invention relates to an atomic number image processing method in security check, belongs to the technical field of radiation imaging, and solves the problems of complex algorithm and long data processing time in the prior art. The method comprises the following steps: acquiring a high/low-energy projection image, and performing projection decomposition processing on the image to obtain a decomposition coefficient; processing based on the decomposition coefficient to obtain an effective atomic number image; wherein the projection decomposition processing refers to performing projection decomposition on the high/low-energy projection image by using a basis effect model or a basis material model; processing based on the high/low energy projection image to obtain a cross-sectional image; and carrying out fusion processing on the cross-sectional image and the effective atomic image to obtain an updated effective atomic number image. The atomic number image quality is improved through a simple processing proces