Image generation method and system for security check system

The invention relates to an image generation method and system for a security check system, belongs to the technical field of security check imaging, and solves the problem that in the prior art, a ray source and a detector fluctuate along with time, so that a dirty image appears in security check imaging. The image generation method comprises the following steps: sampling pixel values of all detector units on a detector as original image data sampled at the current time; updating the gain updating array according to the original image data sampled at the current time to obtain an updated gain updating array; updating the gain data according to the updated gain updating array to obtain updated gain data; and performing gain correction on the currently sampled original image data according to the updated gain data to generate corrected image data. Through real-time updating of gain data in the security check system, dirty images are avoided, and the accuracy of security check imaging is improved. 本发明涉及一种用于安检系统